text: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  /**
   * @addtogroup NeuralNetworks
   * @{
   */
  
  /**
   * @file NeuralNetworks.h
   */
  
  #ifndef ANDROID_FRAMEWORKS_ML_NN_RUNTIME_NEURAL_NETWORKS_H
  #define ANDROID_FRAMEWORKS_ML_NN_RUNTIME_NEURAL_NETWORKS_H
  
  /******************************************************************
   *
   * IMPORTANT NOTICE:
   *
   *   This file is part of Android's set of stable system headers
   *   exposed by the Android NDK (Native Development Kit).
   *
   *   Third-party source AND binary code relies on the definitions
   *   here to be FROZEN ON ALL UPCOMING PLATFORM RELEASES.
   *
   *   - DO NOT MODIFY ENUMS (EXCEPT IF YOU ADD NEW 32-BIT VALUES)
   *   - DO NOT MODIFY CONSTANTS OR FUNCTIONAL MACROS
   *   - DO NOT CHANGE THE SIGNATURE OF FUNCTIONS IN ANY WAY
   *   - DO NOT CHANGE THE LAYOUT OR SIZE OF STRUCTURES
   */
  
  #include <android/hardware_buffer.h>
  #include <stdbool.h>
  #include <stddef.h>
  #include <stdint.h>
  #include <sys/cdefs.h>
  
  #include "NeuralNetworksTypes.h"
  
  // This is required for building libneuralnetworks_cl,
  // the symbols have same names as in NDK, but
  // they are not bounded by API availability.
  #ifdef NN_COMPATIBILITY_LIBRARY_BUILD
  #define __NNAPI_INTRODUCED_IN(x)
  #else
  #define __NNAPI_INTRODUCED_IN(x) __INTRODUCED_IN(x)
  #endif
  
  // TODO: replace __ANDROID_API_FUTURE__with 31 when it's official (b/178144708)
  // This is required for __builtin_available guards around functionality
  // introduced in FL5/API31.
  #ifndef __NNAPI_FL5_MIN_ANDROID_API__
  #define __NNAPI_FL5_MIN_ANDROID_API__ __ANDROID_API_FUTURE__
  #endif
  
  __BEGIN_DECLS
  
  /**
   * Create a {@link ANeuralNetworksMemoryDesc} with no properties.
   *
   * This only creates the memory descriptor. Its properties should be set with calls to
   * {@link ANeuralNetworksMemoryDesc_addInputRole},
   * {@link ANeuralNetworksMemoryDesc_addOutputRole}, and
   * {@link ANeuralNetworksMemoryDesc_setDimensions}.
   *
   * {@link ANeuralNetworksMemoryDesc_finish} must be called once all properties have been set.
   *
   * {@link ANeuralNetworksMemoryDesc_free} must be called once the memory descriptor
   * is no longer needed.
   *
   * Available since NNAPI feature level 4.
   *
   * @param desc The {@link ANeuralNetworksMemoryDesc} to be created.
   *             Set to NULL if unsuccessful.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksMemoryDesc_create(ANeuralNetworksMemoryDesc** desc) __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Destroy a memory descriptor.
   *
   * The memory descriptor need not have been finished by a call to
   * {@link ANeuralNetworksMemoryDesc_finish}.
   *
   * See {@link ANeuralNetworksMemoryDesc} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 4.
   *
   * @param desc The memory descriptor to be destroyed. Passing NULL is acceptable and
   *             results in no operation.
   */
  void ANeuralNetworksMemoryDesc_free(ANeuralNetworksMemoryDesc* desc) __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Specify that a memory object will be playing the role of an input to an execution created from a
   * particular compilation.
   *
   * The compilation and the input index fully specify an input operand. This function
   * may be invoked multiple times on the same memory descriptor with different input operands,
   * and the same input operand may be specified on multiple memory descriptors. However,
   * specifying the same input operand on the same memory descriptor more than once will
   * return an error.
   *
   * The dimensions of the corresponding model operands of all the roles specified by
   * {@link ANeuralNetworksMemoryDesc_addInputRole} and
   * {@link ANeuralNetworksMemoryDesc_addOutputRole} must be compatible with each other. Two
   * dimensions are incompatible if both ranks are fully specified but have different values, or if
   * there is at least one axis that is fully specified in both but has different values.
   *
   * At least one of {@link ANeuralNetworksMemoryDesc_addInputRole} and
   * {@link ANeuralNetworksMemoryDesc_addOutputRole} must be called on a memory descriptor
   * before invoking {@link ANeuralNetworksMemoryDesc_finish}.
   *
   * Attempting to modify a memory descriptor once {@link ANeuralNetworksMemoryDesc_finish} has been
   * called will return an error.
   *
   * See {@link ANeuralNetworksMemoryDesc} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 4.
   *
   * @param desc The memory descriptor to be modified.
   * @param compilation The compilation object. It must already have been finished by calling
   *                    {@link ANeuralNetworksCompilation_finish}, and must outlive the memory
   *                    descriptor.
   * @param index The index of the input argument we are referencing from the compilation. It is
   *              an index into the inputs list passed to
   *              {@link ANeuralNetworksModel_identifyInputsAndOutputs}. It is not
   *              the index associated with {@link ANeuralNetworksModel_addOperand}.
   * @param frequency A floating-point value within the range (0.0, 1.0]. Describes how likely the
   *                  memory is to be used in the specified role. This is provided as a hint to
   *                  optimize the case when different roles prefer different memory locations or data
   *                  layouts.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksMemoryDesc_addInputRole(ANeuralNetworksMemoryDesc* desc,
                                             const ANeuralNetworksCompilation* compilation,
                                             uint32_t index, float frequency)
          __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Specify that a memory object will be playing the role of an output to an execution created from a
   * particular compilation.
   *
   * The compilation and the output index fully specify an output operand. This function
   * may be invoked multiple times on the same memory descriptor with different output operands,
   * and the same output operand may be specified on multiple memory descriptors. However,
   * specifying the same output operand on the same memory descriptor object more than once will
   * return an error.
   *
   * The dimensions of the corresponding model operands of all the roles specified by
   * {@link ANeuralNetworksMemoryDesc_addInputRole} and
   * {@link ANeuralNetworksMemoryDesc_addOutputRole} must be compatible with each other. Two
   * dimensions are incompatible if both ranks are fully specified but have different values, or if
   * there is at least one axis that is fully specified in both but has different values.
   *
   * At least one of {@link ANeuralNetworksMemoryDesc_addInputRole} and
   * {@link ANeuralNetworksMemoryDesc_addOutputRole} must be called on the memory descriptor
   * before invoking {@link ANeuralNetworksMemoryDesc_finish}.
   *
   * Attempting to modify a memory descriptor once {@link ANeuralNetworksMemoryDesc_finish} has been
   * called will return an error.
   *
   * See {@link ANeuralNetworksMemoryDesc} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 4.
   *
   * @param desc The memory descriptor to be modified.
   * @param compilation The compilation object. It must already have been finished by calling
   *                    {@link ANeuralNetworksCompilation_finish}, and must outlive the memory
   *                    descriptor.
   * @param index The index of the output argument we are referencing from the compilation. It is
   *              an index into the outputs list passed to
   *              {@link ANeuralNetworksModel_identifyInputsAndOutputs}. It is not
   *              the index associated with {@link ANeuralNetworksModel_addOperand}.
   * @param frequency A floating-point value within the range (0.0, 1.0]. Describes how likely the
   *                  memory is to be used in the specified role. This is provided as a hint to
   *                  optimize the case when multiple roles prefer different memory locations or data
   *                  layouts.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksMemoryDesc_addOutputRole(ANeuralNetworksMemoryDesc* desc,
                                              const ANeuralNetworksCompilation* compilation,
                                              uint32_t index, float frequency)
          __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Set the dimensional information of the memory descriptor.
   *
   * The specified dimensions must be compatible with the dimensions of the corresponding model
   * operands of all the roles specified by {@link ANeuralNetworksMemoryDesc_addInputRole} and
   * {@link ANeuralNetworksMemoryDesc_addOutputRole}. Two dimensions are incompatible if both ranks
   * are fully specified but have different values, or if there is at least one axis that is fully
   * specified in both but has different values.
   *
   * Attempting to modify a memory descriptor once {@link ANeuralNetworksMemoryDesc_finish} has been
   * called will return an error.
   *
   * See {@link ANeuralNetworksMemoryDesc} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 4.
   *
   * @param desc The memory descriptor to be modified.
   * @param rank The number of dimensions. Must be 0 for scalars.
   * @param dimensions An array of dimensions. An entry with the value 0 indicates that the
   *                   corresponding axis has an unknown size.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksMemoryDesc_setDimensions(ANeuralNetworksMemoryDesc* desc, uint32_t rank,
                                              const uint32_t* dimensions) __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Indicate that we have finished modifying a memory descriptor. Required before calling
   * {@link ANeuralNetworksMemory_createFromDesc}.
   *
   * This function must only be called once for a given memory descriptor.
   *
   * See {@link ANeuralNetworksMemoryDesc} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 4.
   *
   * @param desc The memory descriptor to be finished.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksMemoryDesc_finish(ANeuralNetworksMemoryDesc* desc) __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Creates a memory object from a memory descriptor.
   *
   * The memory object is created with an uninitialized buffer. A memory object with an uninitialized
   * buffer may only be used according to the roles specified by {@link
   * ANeuralNetworksMemoryDesc_addOutputRole}, or as the destination memory in {@link
   * ANeuralNetworksMemory_copy}. The buffer of a memory object is initialized after the memory object
   * is used as an output in a successful execution, or used as the destination memory in a successful
   * {@link ANeuralNetworksMemory_copy}. A memory object with an initialized buffer may be used
   * according to all roles specified in {@link ANeuralNetworksMemoryDesc}, or as the source or
   * destination memory in {@link ANeuralNetworksMemory_copy}. The buffer of a memory object will
   * return to the uninitialized state if the memory object is used as an output in a failed
   * execution, or used as the destination memory in a failed {@link ANeuralNetworksMemory_copy}.
   *
   * The dimensions of the memory descriptor are deduced from the dimensions of the corresponding
   * model operands of all the roles specified by {@link ANeuralNetworksMemoryDesc_addInputRole} and
   * {@link ANeuralNetworksMemoryDesc_addOutputRole}, as well as the dimensions set by the call to
   * {@link ANeuralNetworksMemoryDesc_setDimensions}, if any. The memory descriptor may have
   * unspecified dimensions or rank. In such a case, the same memory object may be used with different
   * shapes of outputs in different executions. When the memory is used as an input, the input shape
   * must be the same as the output shape from the last execution using this memory object as an
   * output, or the last {@link ANeuralNetworksMemory_copy} using this memory object as the
   * destination memory. Creating a memory object with unspecified dimensions or rank may fail for
   * certain sets of roles.
   *
   * Using the memory in roles or shapes that are not compatible with the rules specified above will
   * return an error.
   *
   * When calling {@link ANeuralNetworksExecution_setInputFromMemory} or
   * {@link ANeuralNetworksExecution_setOutputFromMemory} with the memory object,
   * both offset and length must be set to zero and the entire memory region will be
   * associated with the specified input or output operand.
   *
   * Calling {@link ANeuralNetworksModel_setOperandValueFromMemory} with the memory created from this
   * function will return an error.
   *
   * {@link ANeuralNetworksMemory_free} must be called once the memory is no longer needed.
   *
   * Attempting to create memory from an unfinished memory descriptor will return an error.
   *
   * The provided {@link ANeuralNetworksMemoryDesc} need not outlive the {@link ANeuralNetworksMemory}
   * object.
   *
   * Available since NNAPI feature level 4.
   *
   * @param desc The memory descriptor.
   * @param memory The memory object to be created.
   *               Set to NULL if unsuccessful.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful; ANEURALNETWORKS_OP_FAILED if the memory is
   *         created with unspecified dimensions or rank and it is not supported for this set of
   *         roles.
   */
  int ANeuralNetworksMemory_createFromDesc(const ANeuralNetworksMemoryDesc* desc,
                                           ANeuralNetworksMemory** memory) __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Copies data from one memory object to another.
   *
   * If at most one of the src and dst is created from {@link ANeuralNetworksMemory_createFromDesc},
   * the src and dst must have the same logical size:
   * - If the memory is created from {@link ANeuralNetworksMemory_createFromFd}, or if it is created
   *   from {@link ANeuralNetworksMemory_createFromAHardwareBuffer} with format of
   *   AHARDWAREBUFFER_FORMAT_BLOB, the logical size equals the size of the memory.
   * - If the memory is created from {@link ANeuralNetworksMemory_createFromAHardwareBuffer} with a
   *   format other than AHARDWAREBUFFER_FORMAT_BLOB, the logical size equals the size when there is
   *   no padding and the data is tightly packed. This function may fail if the AHardwareBuffer
   *   cannot be accessed.
   * - If the memory is created from {@link ANeuralNetworksMemory_createFromDesc}, the logical size
   *   equals the size indicated by the {@link OperandCode} multiplied by the number of elements. This
   *   function will fail if the number of elements is unknown.
   *
   * If both src and dst are created from {@link ANeuralNetworksMemory_createFromDesc}, they must have
   * compatible dimensions. Two dimensions are incompatible if both ranks are fully specified but
   * have different values, or if there is at least one axis that is fully specified in both but has
   * different values. The dst may have unspecified dimensions or rank. In such a case, the dimensions
   * of dst will get updated according to the dimensions of the src.
   *
   * In both cases, if the src is created from {@link ANeuralNetworksMemory_createFromDesc}, it must
   * have been used as an output in a successful execution, or used as the destination memory in a
   * successful {@link ANeuralNetworksMemory_copy}.
   *
   * The src and dst may have different data layout, in which case the data copying is performed
   * logically with data layout transformation.
   *
   * Available since NNAPI feature level 4.
   *
   * @param src The source memory object.
   * @param dst The destination memory object.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksMemory_copy(const ANeuralNetworksMemory* src, const ANeuralNetworksMemory* dst)
          __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Get the number of available devices.
   *
   * @param numDevices Used to return the number of devices.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *
   * Available since NNAPI feature level 3.
   */
  int ANeuralNetworks_getDeviceCount(uint32_t* numDevices) __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Get the representation of the specified device.
   *
   * @param devIndex The index of the specified device. Must be less than the
                     number of available devices.
   * @param device The representation of the specified device.
   *               The same representation will always be returned for the specified
   *               device.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *
   * Available since NNAPI feature level 3.
   */
  int ANeuralNetworks_getDevice(uint32_t devIndex, ANeuralNetworksDevice** device)
          __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Get the name of the specified device.
   *
   * @param device The representation of the specified device.
   * @param name   The returned name of the specified device. The name will be in UTF-8
   *               and will be null-terminated. It will be recognizable as a known device name
   *               rather than a cryptic string. For devices with feature level reported by
   *               {@link ANeuralNetworksDevice_getFeatureLevel} that is
   *               {@link ANEURALNETWORKS_FEATURE_LEVEL_3} and higher, the format of the name is
   *               {VENDOR}-{DEVICE}. For devices with feature level
   *               {@link ANEURALNETWORKS_FEATURE_LEVEL_2} or lower, the format of the name is
   *               undefined. The name will remain valid for the duration of the application.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *
   * Available since NNAPI feature level 3.
   */
  int ANeuralNetworksDevice_getName(const ANeuralNetworksDevice* device, const char** name)
          __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Get the type of a given device.
   *
   * The device type can be used to help application developers to distribute Machine Learning
   * workloads and other workloads such as graphical rendering.
   * E.g., for an app which renders AR scenes based on real time object detection results,
   * the developer could choose an ACCELERATOR type device for ML workloads, and reserve GPU
   * for graphical rendering.
   *
   * @param device The representation of the specified device.
   * @param type The returned {@link DeviceTypeCode} of the specified device.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *
   * Available since NNAPI feature level 3.
   */
  int ANeuralNetworksDevice_getType(const ANeuralNetworksDevice* device, int32_t* type)
          __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Get the version of the driver implementation of the specified device.
   *
   * It’s the responsibility of the driver implementor to insure that this version string
   * uniquely distinguishes this implementation from all previous implementations.
   *
   * This version string must not be confused with the feature level which is solely defined
   * by {@link ANeuralNetworksDevice_getFeatureLevel}. There is no implicit ordering of the versions.
   * For example, it is not possible to filter all drivers older than a certain version.
   *
   * Application developers may use this version string to avoid or prefer specific driver
   * implementations. For example, an application may want to do so because:
   *     - A specific version of the driver does not provide the required performance,
   *       perhaps because of a performance regression.
   *     - A specific version of the driver has a bug or returns results that don’t match
   *       the minimum precision requirement for the application.
   *
   * @param device The representation of the specified device.
   * @param version The returned version string of the driver for the specified device. The
   *                string will be in UTF-8 and will be null-terminated. For devices with feature
   *                level 28 or lower, "UNKNOWN" will be returned. The version string will remain
   *                valid for the duration of the application.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *
   * Available since NNAPI feature level 3.
   */
  int ANeuralNetworksDevice_getVersion(const ANeuralNetworksDevice* device, const char** version)
          __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Get the NNAPI feature level of the specified NNAPI device.
   *
   * Each device has a supported feature level, which is the most advanced NNAPI specification
   * and features this driver implements. For example, if the driver implements the features
   * introduced in {@link ANEURALNETWORKS_FEATURE_LEVEL_2}, but does not implement the features
   * introduced after {@link ANEURALNETWORKS_FEATURE_LEVEL_2}, the value would be
   * {@link ANEURALNETWORKS_FEATURE_LEVEL_2}. Developers could decide whether or not the specified
   * device should be used for a model that has certain feature requirements.
   *
   * NNAPI device feature level is closely related to NNAPI runtime feature level
   * ({@link ANeuralNetworks_getRuntimeFeatureLevel}), which indicates an NNAPI runtime feature
   * level (the most advanced NNAPI specification and features that the runtime implements).
   * An NNAPI device feature level is always less than or equal to the runtime feature level.
   *
   * This function produces a {@link FeatureLevelCode} enum value, NOT an Android API level.
   *
   * @param device The representation of the specified device.
   * @param featureLevel {@link FeatureLevelCode} of the most advanced feature this driver implements.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *
   * Available since NNAPI feature level 3.
   */
  int ANeuralNetworksDevice_getFeatureLevel(const ANeuralNetworksDevice* device,
                                            int64_t* featureLevel) __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Wait until the device is in a live state.
   *
   * A device may encounter internal errors and temporarily enter a dead state. A
   * call that uses a device in such a state will return with the error
   * {@link ANEURALNETWORKS_DEAD_OBJECT}. ANeuralNetworksDevice_wait will block until
   * the device is in a live state.
   *
   * @param device The representation of the specified device.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *
   * Available since NNAPI feature level 4.
   */
  int ANeuralNetworksDevice_wait(const ANeuralNetworksDevice* device) __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Get the supported operations for a specified set of devices. If multiple devices
   * are selected, the supported operation list is a union of supported operations of all
   * selected devices.
   *
   * @param model The model to be queried.
   * @param devices The set of devices. Must not contain duplicates.
   * @param numDevices The number of devices in the set.
   * @param supportedOps The boolean array to be filled. True means supported. The size of the
   *                     boolean array must be at least as large as the number of operations
   *                     in the model. The order of elements in the supportedOps array matches
   *                     the order in which the corresponding operations were added to the model.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *
   * Available since NNAPI feature level 3.
   */
  int ANeuralNetworksModel_getSupportedOperationsForDevices(
          const ANeuralNetworksModel* model, const ANeuralNetworksDevice* const* devices,
          uint32_t numDevices, bool* supportedOps) __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Create a {@link ANeuralNetworksCompilation} to compile the given model for a specified set
   * of devices. If more than one device is specified, the compilation will
   * distribute the workload automatically across the devices. The model must be fully
   * supported by the specified set of devices. This means that
   * ANeuralNetworksModel_getSupportedOperationsForDevices() must have returned true for every
   * operation for that model/devices pair.
   *
   * The user must handle all compilation and execution failures from the
   * specified set of devices. This is in contrast to a use of {@link
   * ANeuralNetworksCompilation_create}, where the runtime will attempt to recover
   * from such failures.
   *
   * The model passed to this function is termed the "main model" of the
   * compilation, to distinguish it from other models referred to by an Operand
   * of type {@link ANEURALNETWORKS_MODEL} within this compilation.
   *
   * @param model The {@link ANeuralNetworksModel} to be compiled.
   * @param devices The set of devices. Must not contain duplicates.
   * @param numDevices The number of devices in the set.
   * @param compilation The newly created object or NULL if unsuccessful.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful, ANEURALNETWORKS_BAD_DATA
   *         if the model is invalid.
   *
   * Available since NNAPI feature level 3.
   */
  int ANeuralNetworksCompilation_createForDevices(ANeuralNetworksModel* model,
                                                  const ANeuralNetworksDevice* const* devices,
                                                  uint32_t numDevices,
                                                  ANeuralNetworksCompilation** compilation)
          __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Sets the compilation caching signature and the cache directory.
   *
   * Provides optional caching information to the runtime for faster repeated
   * compilation.
   *
   * See {@link ANeuralNetworksCompilation} for information on multithreaded usage.
   *
   * @param compilation The compilation to be modified.
   * @param cacheDir The cache directory for the runtime to store and retrieve caching
   *                 data. It is recommended to use the code cache directory provided
   *                 by the Android runtime. If not using the code cache directory, the
   *                 user should choose a directory local to the application, and is
   *                 responsible for managing the cache entries.
   * @param token The token provided by the user to specify a model must be of length
   *              ANEURALNETWORKS_BYTE_SIZE_OF_CACHE_TOKEN. The user should ensure that
   *              the token is unique to a model within the application. The NNAPI
   *              runtime cannot detect token collisions; a collision will result in a
   *              failed execution or in a successful execution that produces incorrect
   *              output values.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *
   * Available since NNAPI feature level 3.
   */
  int ANeuralNetworksCompilation_setCaching(ANeuralNetworksCompilation* compilation,
                                            const char* cacheDir, const uint8_t* token)
          __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Schedule synchronous evaluation of the execution.
   *
   * <p>Schedules synchronous evaluation of the execution. Returns once the
   * execution has completed and the outputs are ready to be consumed.
   * </p>
   *
   * If {@link ANeuralNetworksExecution_setTimeout} was called on this execution,
   * and the execution is not able to complete before the timeout duration is
   * exceeded, then execution may be aborted, in which case
   * ANEURALNETWORKS_MISSED_DEADLINE_* {@link ResultCode} will be returned. If the device has
   * a feature level reported by {@link ANeuralNetworksDevice_getFeatureLevel}
   * that is lower than 30, then the timeout duration hint will be ignored.
   *
   * If this execution contains a {@link ANEURALNETWORKS_WHILE} operation, and
   * the condition model does not output false within the loop timeout duration,
   * then execution will be aborted and ANEURALNETWORKS_MISSED_DEADLINE_* {@link ResultCode}
   * will be returned.
   *
   * Before NNAPI feature level 5, this function may only be invoked when the execution is in the
   * preparation state. Starting at NNAPI feature level 5, if the user sets the execution to be
   * reusable by {@link ANeuralNetworksExecution_setReusable}, this function may also be invoked when
   * the execution is in the completed state.
   *
   * See {@link ANeuralNetworksExecution} for information on execution states and multithreaded usage.
   *
   * See {@link ANeuralNetworksExecution_burstCompute} for burst synchronous execution.
   * See {@link ANeuralNetworksExecution_startCompute} for regular asynchronous execution.
   * See {@link ANeuralNetworksExecution_startComputeWithDependencies} for
   * asynchronous execution with dependencies.
   *
   * Available since NNAPI feature level 3.
   *
   * @param execution The execution to be scheduled and executed.
   *
   * @return ANEURALNETWORKS_NO_ERROR if the execution completed normally.
   *         ANEURALNETWORKS_UNMAPPABLE if the execution input or output memory cannot
   *         be properly mapped.
   */
  int ANeuralNetworksExecution_compute(ANeuralNetworksExecution* execution) __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Get the dimensional information of the specified output operand of the model of the
   * latest computation evaluated on {@link ANeuralNetworksExecution}.
   *
   * This function may only be invoked when the execution is in the completed state.
   *
   * See {@link ANeuralNetworksExecution} for information on execution states.
   *
   * @param execution The execution to be queried.
   * @param index The index of the output argument we are querying. It is
   *              an index into the lists passed to
   *              {@link ANeuralNetworksModel_identifyInputsAndOutputs}. It is not
   *              the index associated with {@link ANeuralNetworksModel_addOperand}.
   * @param rank The rank of the output operand.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful, ANEURALNETWORKS_OUTPUT_INSUFFICIENT_SIZE
   *         if the target output is provided an insufficient buffer at execution time,
   *         ANEURALNETWORKS_BAD_DATA if the index is invalid.
   *
   * Available since NNAPI feature level 3.
   */
  int ANeuralNetworksExecution_getOutputOperandRank(ANeuralNetworksExecution* execution,
                                                    int32_t index, uint32_t* rank)
          __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Get the dimensional information of the specified output operand of the model of the
   * latest computation evaluated on {@link ANeuralNetworksExecution}. The target output operand
   * cannot be a scalar.
   *
   * This function may only be invoked when the execution is in the completed state.
   *
   * See {@link ANeuralNetworksExecution} for information on execution states.
   *
   * @param execution The execution to be queried.
   * @param index The index of the output argument we are querying. It is an index into the lists
   *              passed to {@link ANeuralNetworksModel_identifyInputsAndOutputs}. It is not
   *              the index associated with {@link ANeuralNetworksModel_addOperand}.
   * @param dimensions The dimension array to be filled. The size of the array must be exactly as
   *                   large as the rank of the output operand to be queried in the model.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful, ANEURALNETWORKS_OUTPUT_INSUFFICIENT_SIZE
   *         if the target output is provided an insufficient buffer at execution time,
   *         ANEURALNETWORKS_BAD_DATA if the index is invalid or if the target is a scalar.
   *
   * Available since NNAPI feature level 3.
   */
  int ANeuralNetworksExecution_getOutputOperandDimensions(ANeuralNetworksExecution* execution,
                                                          int32_t index, uint32_t* dimensions)
          __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Create a {@link ANeuralNetworksBurst} to apply the given compilation.
   * This only creates the burst object. Computation is only performed once
   * {@link ANeuralNetworksExecution_burstCompute} is invoked with a valid
   * {@link ANeuralNetworksExecution} and {@link ANeuralNetworksBurst}.
   *
   * <p>The provided compilation must outlive the burst object.</p>
   *
   * Available since NNAPI feature level 3.
   *
   * @param compilation The {@link ANeuralNetworksCompilation} to be evaluated.
   * @param burst The newly created object or NULL if unsuccessful.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful, ANEURALNETWORKS_BAD_DATA
   *         if the compilation is invalid.
   */
  int ANeuralNetworksBurst_create(ANeuralNetworksCompilation* compilation,
                                  ANeuralNetworksBurst** burst) __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Destroys the burst object.
   *
   * Available since NNAPI feature level 3.
   *
   * @param burst The burst object to be destroyed. Passing NULL is acceptable and
   *              results in no operation.
   */
  void ANeuralNetworksBurst_free(ANeuralNetworksBurst* burst) __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Schedule synchronous evaluation of the execution on a burst object.
   *
   * <p>Schedules synchronous evaluation of the execution. Returns once the
   * execution has completed and the outputs are ready to be consumed.</p>
   *
   * If {@link ANeuralNetworksExecution_setTimeout} was called on the execution,
   * and the execution is not able to complete before the timeout duration is
   * exceeded, then execution may be aborted, in which case
   * ANEURALNETWORKS_MISSED_DEADLINE_* {@link ResultCode} will be returned.
   *
   * If the execution contains a {@link ANEURALNETWORKS_WHILE} operation, and
   * the condition model does not output false within the loop timeout duration,
   * then execution will be aborted and ANEURALNETWORKS_MISSED_DEADLINE_* {@link ResultCode}
   * will be returned. If the device has a feature level reported by
   * {@link ANeuralNetworksDevice_getFeatureLevel} that is lower than
   * {@link ANEURALNETWORKS_FEATURE_LEVEL_4}, then the timeout duration hint will be ignored.
   *
   * <p>There must be at most one {@link ANeuralNetworksExecution} processing at
   * any given time for any given burst object. Any
   * {@link ANeuralNetworksExecution} launched before the previous has finished
   * will result in ANEURALNETWORKS_BAD_STATE.</p>
   *
   * Before NNAPI feature level 5, this function may only be invoked when the execution is in the
   * preparation state. Starting at NNAPI feature level 5, if the user sets the execution to be
   * reusable by {@link ANeuralNetworksExecution_setReusable}, this function may also be invoked when
   * the execution is in the completed state.
   *
   * See {@link ANeuralNetworksExecution} for information on execution states and multithreaded usage.
   *
   * See {@link ANeuralNetworksExecution_compute} for synchronous execution.
   * See {@link ANeuralNetworksExecution_startCompute} for regular asynchronous execution.
   * See {@link ANeuralNetworksExecution_startComputeWithDependencies} for
   * asynchronous execution with dependencies.
   *
   * Available since NNAPI feature level 3.
   *
   * @param burst The burst object to execute on.
   * @param execution The execution to be scheduled and executed. The execution
   *                  must be created from the same {@link
   *                  ANeuralNetworksCompilation} as the burst object.
   *
   * @return ANEURALNETWORKS_NO_ERROR if the execution completed normally.
   */
  int ANeuralNetworksExecution_burstCompute(ANeuralNetworksExecution* execution,
                                            ANeuralNetworksBurst* burst) __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Creates a shared memory object from an AHardwareBuffer handle.
   *
   * If the shared memory is backed by an AHardwareBuffer of AHARDWAREBUFFER_FORMAT_BLOB
   * format, it can be used the same way as shared memory created from a file handle. See
   * {@link ANeuralNetworksMemory} for a description on how to use this shared memory.
   *
   * If the shared memory is backed by an AHardwareBuffer of a format other than
   * AHARDWAREBUFFER_FORMAT_BLOB, it can only be used for model inputs and outputs.
   * When calling {@link ANeuralNetworksExecution_setInputFromMemory} or
   * {@link ANeuralNetworksExecution_setOutputFromMemory} with the shared memory, both
   * offset and length must be set to zero and the entire memory region will be
   * associated with the specified input or output operand. There is no guarantee
   * that an arbitrary AHardwareBuffer_Format and AHardwareBuffer_UsageFlags combination
   * can be used by arbitrary devices. The execution will fail if the selected set of
   * devices cannot consume the buffer.
   *
   * Calling {@link ANeuralNetworksModel_setOperandValueFromMemory} with shared memory
   * backed by an AHardwareBuffer of a format other than AHARDWAREBUFFER_FORMAT_BLOB is
   * disallowed.
   *
   * The provided AHardwareBuffer must outlive the ANeuralNetworksMemory object.
   *
   * Available since NNAPI feature level 3.
   *
   * @param ahwb The AHardwareBuffer handle.
   * @param memory The memory object to be created.
   *               Set to NULL if unsuccessful.
   *
   * @return ANEURALNETWORKS_NO_ERROR if the request completed normally.
   *
   * @see AHardwareBuffer
   */
  int ANeuralNetworksMemory_createFromAHardwareBuffer(const AHardwareBuffer* ahwb,
                                                      ANeuralNetworksMemory** memory)
          __NNAPI_INTRODUCED_IN(29);
  
  /**
  
   * Specifies whether duration of the {@link ANeuralNetworksExecution} is to be
   * measured. Evaluation of the execution must not have been scheduled.
   *
   * By default, duration is not measured.
   *
   * The {@link ANeuralNetworksExecution} must have been created from an
   * {@link ANeuralNetworksCompilation} which in turn was created from
   * {@link ANeuralNetworksCompilation_createForDevices} with numDevices = 1.
   * If the device has a feature level reported by
   * {@link ANeuralNetworksDevice_getFeatureLevel} that is lower than
   * {@link ANEURALNETWORKS_FEATURE_LEVEL_3}, then the duration will not be measured.
   *
   * This function may only be invoked when the execution is in the preparation state.
   *
   * See {@link ANeuralNetworksExecution} for information on execution states and multithreaded usage.
   *
   * Available since NNAPI feature level 3.
   *
   * @param execution The execution to be modified.
   * @param measure 'true' if duration is to be measured, 'false' if not.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksExecution_setMeasureTiming(ANeuralNetworksExecution* execution, bool measure)
          __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Get the time spent in the latest computation evaluated on the specified
   * {@link ANeuralNetworksExecution}, in nanoseconds.
   *
   * This function may only be invoked when the execution is in the completed state.
   *
   * See {@link ANeuralNetworksExecution} for information on execution states.
   *
   * @param execution The execution to be queried.
   * @param durationCode The measurement to be queried, specified by {@link DurationCode}.
   * @param duration The returned duration. If no measurement was requested by
   *                 {@link ANeuralNetworksExecution_setMeasureTiming}, if the
   *                 device is has a feature level reported by
   *                 {@link ANeuralNetworksDevice_getFeatureLevel} that is lower
   *                 than {@link ANEURALNETWORKS_FEATURE_LEVEL_3}, or for some other
   *                 reason the duration is not available, UINT64_MAX will be returned.
   *                 A particular device need not support any given measurement.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *
   * Available since NNAPI feature level 3.
   */
  int ANeuralNetworksExecution_getDuration(const ANeuralNetworksExecution* execution,
                                           int32_t durationCode, uint64_t* duration)
          __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Creates a shared memory object from a file descriptor.
   *
   * The shared memory is backed by a file descriptor via mmap.
   * See {@link ANeuralNetworksMemory} for a description on how to use
   * this shared memory.
   *
   * Available since NNAPI feature level 1.
   *
   * @param size The requested size in bytes.
   *             Must not be larger than the file size.
   * @param protect The desired memory protection for the mapping.
   *             It is either PROT_NONE or the bitwise OR of one or
   *             more of the following flags: PROT_READ, PROT_WRITE.
   * @param fd The requested file descriptor.
   *           The file descriptor has to be mmap-able. The file
   *           descriptor will be duplicated.
   * @param offset The offset to the beginning of the file of the area to map.
   *               The offset has to be aligned to a page size.
   * @param memory The memory object to be created.
   *               Set to NULL if unsuccessful.
   *
   * @return ANEURALNETWORKS_NO_ERROR if the request completed normally.
   */
  int ANeuralNetworksMemory_createFromFd(size_t size, int protect, int fd, size_t offset,
                                         ANeuralNetworksMemory** memory) __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Delete a memory object.
   *
   * Destroys the object used by the run time to keep track of the memory.
   * This will free the underlying actual memory if no other code has open
   * handles to this memory.
   *
   * Available since NNAPI feature level 1.
   *
   * @param memory The memory object to be freed. Passing NULL is acceptable and
   *               results in no operation.
   */
  void ANeuralNetworksMemory_free(ANeuralNetworksMemory* memory) __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Create an empty {@link ANeuralNetworksModel}.
   *
   * <p>This only creates the object. Computation is performed once
   * {@link ANeuralNetworksExecution_burstCompute},
   * {@link ANeuralNetworksExecution_compute},
   * {@link ANeuralNetworksExecution_startCompute} or
   * {@link ANeuralNetworksExecution_startComputeWithDependencies} is invoked.
   *
   * The model should be constructed with calls to
   * {@link ANeuralNetworksModel_addOperation} and
   * {@link ANeuralNetworksModel_addOperand}
   *
   * <p>{@link ANeuralNetworksModel_finish} should be called once the model
   * has been fully constructed.</p>
   *
   * <p>{@link ANeuralNetworksModel_free} should be called once the model
   * is no longer needed.</p>
   *
   * Available since NNAPI feature level 1.
   *
   * @param model The {@link ANeuralNetworksModel} to be created.
   *              Set to NULL if unsuccessful.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksModel_create(ANeuralNetworksModel** model) __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Destroy a model.
   *
   * The model need not have been finished by a call to
   * {@link ANeuralNetworksModel_finish}.
   *
   * See {@link ANeuralNetworksModel} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 1.
   *
   * @param model The model to be destroyed. Passing NULL is acceptable and
   *              results in no operation.
   */
  void ANeuralNetworksModel_free(ANeuralNetworksModel* model) __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Indicate that we have finished modifying a model. Required before
   * calling {@link ANeuralNetworksCompilation_create} and
   * {@link ANeuralNetworksCompilation_createForDevices}.
   *
   * An application must ensure that no other thread uses the model at the same
   * time.
   *
   * This function must only be called once for a given model.
   *
   * See {@link ANeuralNetworksModel} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 1.
   *
   * @param model The model to be finished.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksModel_finish(ANeuralNetworksModel* model) __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Add an operand to a model.
   *
   * The order in which the operands are added is important. The first one added
   * to a model will have the index value 0, the second 1, etc. These indexes are
   * used as operand identifiers in
   * {@link ANeuralNetworksModel_addOperation},
   * {@link ANeuralNetworksModel_identifyInputsAndOutputs},
   * {@link ANeuralNetworksModel_setOperandValue},
   * {@link ANeuralNetworksModel_setOperandValueFromMemory},
   * {@link ANeuralNetworksExecution_setInput},
   * {@link ANeuralNetworksExecution_setInputFromMemory},
   * {@link ANeuralNetworksExecution_setOutput}, and
   * {@link ANeuralNetworksExecution_setOutputFromMemory}.
   *
   * <p>Every operand must be referenced in exactly one of the following
   * ways:<ul>
   *    <li>It is identified as a model input with
   *        {@link ANeuralNetworksModel_identifyInputsAndOutputs}.</li>
   *    <li>It is identified as a constant with
   *        {@link ANeuralNetworksModel_setOperandValue} or
   *        {@link ANeuralNetworksModel_setOperandValueFromMemory}.</li>
   *    <li>It is identified as an output of exactly one operation with
   *        {@link ANeuralNetworksModel_addOperation}.</li>
   *    </ul></p>
   * <p>An operand that is identified as a model input or as a constant
   * must not also be identified as a model output with
   * {@link ANeuralNetworksModel_identifyInputsAndOutputs}.</p>
   *
   * To build a model that can accommodate inputs of various sizes, as
   * you may want to do for a CNN, leave unspecified the dimensions that
   * will vary at run time.  If you do so, fully specify dimensions
   * when calling {@link ANeuralNetworksExecution_setInput} or
   * {@link ANeuralNetworksExecution_setInputFromMemory}.
   *
   * Attempting to modify a model once {@link ANeuralNetworksModel_finish} has been
   * called will return an error.
   *
   * See {@link ANeuralNetworksModel} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 1.
   *
   * @param model The model to be modified.
   * @param type The {@link ANeuralNetworksOperandType} that describes the shape
   *             of the operand.  Neither the {@link ANeuralNetworksOperandType}
   *             nor the dimensions it points to need to outlive the call to
   *             {@link ANeuralNetworksModel_addOperand}.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksModel_addOperand(ANeuralNetworksModel* model,
                                      const ANeuralNetworksOperandType* type)
          __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Sets an operand to a constant value.
   *
   * Values of length smaller or equal to
   * ANEURALNETWORKS_MAX_SIZE_OF_IMMEDIATELY_COPIED_VALUES
   * are immediately copied into the model.
   *
   * For values of length greater than
   * ANEURALNETWORKS_MAX_SIZE_OF_IMMEDIATELY_COPIED_VALUES, a pointer to
   * the buffer is stored within the model. The application must not change the
   * content of this region until all executions using this model have
   * completed. As the data may be copied during processing, modifying the data
   * after this call yields undefined results. The provided buffer must outlive
   * this model.
   *
   * For large tensors, using {@link ANeuralNetworksModel_setOperandValueFromMemory}
   * is likely to be more efficient.
   *
   * To indicate that an optional operand should be considered missing,
   * pass nullptr for buffer and 0 for length.
   *
   * Attempting to modify a model once {@link ANeuralNetworksModel_finish} has been
   * called will return an error.
   *
   * See {@link ANeuralNetworksModel} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 1.
   *
   * @param model The model to be modified.
   * @param index The index of the model operand we're setting.
   * @param buffer A pointer to the data to use.
   * @param length The size in bytes of the data value.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksModel_setOperandValue(ANeuralNetworksModel* model, int32_t index,
                                           const void* buffer, size_t length)
          __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Sets an operand's per channel quantization parameters.
   *
   * Sets parameters required by a tensor of type
   * {@link ANEURALNETWORKS_TENSOR_QUANT8_SYMM_PER_CHANNEL}.
   * This function must be called for every tensor of type
   * {@link ANEURALNETWORKS_TENSOR_QUANT8_SYMM_PER_CHANNEL} before
   * calling {@link ANeuralNetworksModel_finish}.
   *
   * Available since NNAPI feature level 3.
   *
   * @param model The model to be modified.
   * @param index The index of the model operand we're setting.
   * @param channelQuant The per channel quantization parameters for the operand.
   *                    No memory in this struct needs to outlive the call to
   *                    this function.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksModel_setOperandSymmPerChannelQuantParams(
          ANeuralNetworksModel* model, int32_t index,
          const ANeuralNetworksSymmPerChannelQuantParams* channelQuant) __NNAPI_INTRODUCED_IN(29);
  
  /**
   * Sets an operand to a value stored in a memory object.
   *
   * The content of the memory is not copied. A reference to that memory is stored
   * inside the model. The application must not change the content of the memory
   * region until all executions using this model have completed.  As the data may
   * be copied during processing, modifying the data after this call yields
   * undefined results.
   *
   * <p>The provided memory must outlive this model.</p>
   *
   * To indicate that an optional operand should be considered missing,
   * use {@link ANeuralNetworksModel_setOperandValue} instead, passing nullptr for buffer.
   *
   * It is disallowed to set an operand value with shared memory backed by an AHardwareBuffer
   * of a format other than AHARDWAREBUFFER_FORMAT_BLOB.
   *
   * It is disallowed to set an operand value with memory created from
   * {@link ANeuralNetworksMemory_createFromDesc}.
   *
   * Attempting to modify a model once {@link ANeuralNetworksModel_finish} has been
   * called will return an error.
   *
   * See {@link ANeuralNetworksModel} for information on multithreaded usage.
   * See {@link ANeuralNetworksMemory_createFromAHardwareBuffer} for information on
   * AHardwareBuffer usage.
   *
   * Available since NNAPI feature level 1.
   *
   * @param model The model to be modified.
   * @param index The index of the model operand we're setting.
   * @param memory The memory containing the data.
   * @param offset This specifies the location of the data within the memory.
   *               The offset is in bytes from the start of memory.
   * @param length The size in bytes of the data value.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksModel_setOperandValueFromMemory(ANeuralNetworksModel* model, int32_t index,
                                                     const ANeuralNetworksMemory* memory,
                                                     size_t offset, size_t length)
          __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Sets an operand to a value that is a reference to another NNAPI model.
   *
   * The referenced model must already have been finished by a call to
   * {@link ANeuralNetworksModel_finish}.
   *
   * The {@link ANeuralNetworksModel_relaxComputationFloat32toFloat16} setting of
   * referenced models is overridden by that setting of the main model of a
   * compilation.
   *
   * The referenced model must outlive the model referring to it.
   *
   * Attempting to modify a model once {@link ANeuralNetworksModel_finish} has
   * been called will return an error.
   *
   * See {@link ANeuralNetworksModel} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 4.
   *
   * @param model The model to be modified.
   * @param index The index of the model operand we're setting.
   * @param value The model to be referenced.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksModel_setOperandValueFromModel(ANeuralNetworksModel* model, int32_t index,
                                                    const ANeuralNetworksModel* value)
          __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Add an operation to a model.
   *
   * @param model The model to be modified.
   * @param type The {@link ANeuralNetworksOperationType} of the operation.
   * @param inputCount The number of entries in the inputs array.
   * @param inputs An array of indexes identifying each operand.
   * @param outputCount The number of entries in the outputs array.
   * @param outputs An array of indexes identifying each operand.
   *
   * The operands specified by inputs and outputs must have been
   * previously added by calls to {@link ANeuralNetworksModel_addOperand}.
   *
   * Attempting to modify a model once {@link ANeuralNetworksModel_finish} has been
   * called will return an error.
   *
   * See {@link ANeuralNetworksModel} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 1.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksModel_addOperation(ANeuralNetworksModel* model,
                                        ANeuralNetworksOperationType type, uint32_t inputCount,
                                        const uint32_t* inputs, uint32_t outputCount,
                                        const uint32_t* outputs) __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Specifies which operands will be the model's inputs and
   * outputs. Every model must have at least one input and one output.
   *
   * An operand cannot be used for both input and output. Doing so will
   * return an error.
   *
   * @param model The model to be modified.
   * @param inputCount The number of entries in the inputs array.
   * @param inputs An array of indexes identifying the input operands.
   * @param outputCount The number of entries in the outputs array.
   * @param outputs An array of indexes identifying the output operands.
   *
   * The operands specified by inputs and outputs must have been
   * previously added by calls to {@link ANeuralNetworksModel_addOperand}.
   *
   * Attempting to modify a model once {@link ANeuralNetworksModel_finish} has been
   * called will return an error.
   *
   * See {@link ANeuralNetworksModel} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 1.
   *
   */
  int ANeuralNetworksModel_identifyInputsAndOutputs(ANeuralNetworksModel* model, uint32_t inputCount,
                                                    const uint32_t* inputs, uint32_t outputCount,
                                                    const uint32_t* outputs)
          __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Specifies whether {@link ANEURALNETWORKS_TENSOR_FLOAT32} is allowed to be
   * calculated with range and/or precision as low as that of the IEEE 754 16-bit
   * floating-point format. By default, {@link ANEURALNETWORKS_TENSOR_FLOAT32}
   * must be calculated using at least the range and precision of the IEEE 754
   * 32-bit floating-point format.
   *
   * The relaxComputationFloat32toFloat16 setting of the main model of
   * a compilation overrides the values of the referenced models.
   *
   * @param model The model to be modified.
   * @param allow 'true' indicates {@link ANEURALNETWORKS_TENSOR_FLOAT32} may be
   *              calculated with range and/or precision as low as that of the
   *              IEEE 754 16-bit floating point format. 'false' indicates
   *              {@link ANEURALNETWORKS_TENSOR_FLOAT32} must be calculated using
   *              at least the range and precision of the IEEE 754 32-bit floating
   *              point format.
   *
   * Attempting to modify a model once {@link ANeuralNetworksModel_finish} has been
   * called will return an error.
   *
   * Available since NNAPI feature level 2.
   *
   * See {@link ANeuralNetworksModel} for information on multithreaded usage.
   */
  int ANeuralNetworksModel_relaxComputationFloat32toFloat16(ANeuralNetworksModel* model, bool allow)
          __NNAPI_INTRODUCED_IN(28);
  
  /**
   * Create a {@link ANeuralNetworksCompilation} to compile the given model.
   *
   * The model passed to this function is termed the "main model" of the
   * compilation, to distinguish it from other models referred to by an Operand
   * of type {@link ANEURALNETWORKS_MODEL} within this compilation.
   *
   * <p>This function only creates the object. Compilation is only performed once
   * {@link ANeuralNetworksCompilation_finish} is invoked.</p>
   *
   * <p>{@link ANeuralNetworksCompilation_finish} should be called once
   * all desired properties have been set on the compilation.</p>
   *
   * <p>{@link ANeuralNetworksModel_free} should be called once the compilation
   * is no longer needed.</p>
   *
   * <p>The provided model must outlive the compilation.</p>
   *
   * The model must already have been finished by a call to
   * {@link ANeuralNetworksModel_finish}.
   *
   * See {@link ANeuralNetworksCompilation} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 1.
   *
   * @param model The {@link ANeuralNetworksModel} to be compiled.
   * @param compilation The newly created object or NULL if unsuccessful.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful, ANEURALNETWORKS_BAD_DATA
   *         if the model is invalid.
   */
  int ANeuralNetworksCompilation_create(ANeuralNetworksModel* model,
                                        ANeuralNetworksCompilation** compilation)
          __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Destroy a compilation.
   *
   * The compilation need not have been finished by a call to
   * {@link ANeuralNetworksCompilation_finish}.
   *
   * See {@link ANeuralNetworksCompilation} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 1.
   *
   * @param compilation The compilation to be destroyed. Passing NULL is acceptable and
   *                    results in no operation.
   */
  void ANeuralNetworksCompilation_free(ANeuralNetworksCompilation* compilation)
          __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Sets the execution preference.
   *
   * <p>Provides guidance to the runtime when trade-offs are possible. By default the runtime
   * uses PREFER_SINGLE_FAST_ANSWER</p>
   *
   * See {@link ANeuralNetworksCompilation} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 1.
   *
   * @param compilation The compilation to be modified.
   * @param preference Either {@link ANEURALNETWORKS_PREFER_LOW_POWER},
   *                  {@link ANEURALNETWORKS_PREFER_FAST_SINGLE_ANSWER}, or
   *                  {@link ANEURALNETWORKS_PREFER_SUSTAINED_SPEED}.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksCompilation_setPreference(ANeuralNetworksCompilation* compilation,
                                               int32_t preference) __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Indicate that we have finished modifying a compilation. Required before
   * calling {@link ANeuralNetworksBurst_create} or
   * {@link ANeuralNetworksExecution_create}.
   *
   * An application must ensure that no other thread uses the compilation at the
   * same time.
   *
   * This function must only be called once for a given compilation.
   *
   * If {@link ANeuralNetworksCompilation_setTimeout} was called on this
   * compilation, and the compilation is not able to be finished before the
   * timeout duration is exceeded, then compilation may be aborted, in which case
   * ANEURALNETWORKS_MISSED_DEADLINE_* {@link ResultCode} will be returned.
   *
   * See {@link ANeuralNetworksCompilation} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 1.
   *
   * @param compilation The compilation to be finished.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksCompilation_finish(ANeuralNetworksCompilation* compilation)
          __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Set the execution priority.
   *
   * Execution priorities are relative to other executions created by the same
   * application (specifically same uid) for the same device. Specifically,
   * priorities of executions from one application will not affect executions from
   * another application. Similarly, priorities of executions on one device will
   * not affect executions on another device.
   *
   * Higher priority executions may use more compute resources than lower priority
   * executions, and may preempt or starve lower priority executions.
   *
   * See {@link ANeuralNetworksCompilation} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 4.
   *
   * @param compilation The compilation to be modified.
   * @param priority The relative priority of the execution compared to other
   *     executions created by the application. Must be one of
   *     ANEURALNETWORKS_PRIORITY_*.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   */
  int ANeuralNetworksCompilation_setPriority(ANeuralNetworksCompilation* compilation, int priority)
          __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Set the maximum expected duration for compiling the model.
   *
   * If the device is not able to complete the compilation within the specified
   * duration, the compilation may be aborted. The timeout duration begins at the
   * call to {@link ANeuralNetworksCompilation_finish}.
   *
   * This timeout duration acts as a hint to drivers, and can be used to both free
   * up compute resources within the driver and return control back to the
   * application quicker than is possible without the hint. It enables drivers
   * that are able to estimate how long a compilation will take to abort the
   * compilation before it has even started if the driver believes the compilation
   * cannot be completed within the timeout duration. Similarly, it enables
   * drivers to abort an ongoing compilation if it is taking too long. However,
   * this call does not guarantee that the compilation will complete or abort
   * within the timeout duration.
   *
   * By default (i.e., unless ANeuralNetworksCompilation_setTimeout is called),
   * the timeout duration for compiling the model is considered infinite.
   *
   * The {@link ANeuralNetworksCompilation} must have been created with
   * {@link ANeuralNetworksCompilation_createForDevices} with numDevices = 1,
   * otherwise this function will fail with ANEURALNETWORKS_BAD_DATA. If the
   * device has a feature level reported by
   * {@link ANeuralNetworksDevice_getFeatureLevel} that is lower than
   * {@link ANEURALNETWORKS_FEATURE_LEVEL_4}, then the timeout duration hint will
   * be ignored.
   *
   * See {@link ANeuralNetworksCompilation} for information on multithreaded usage.
   *
   * @param compilation The compilation to be modified.
   * @param duration The maximum amount of time in nanoseconds that is expected to
   *     be spent finishing a compilation. If this duration is exceeded, the
   *     compilation may be aborted. If set to 0, the timeout duration is
   *     considered infinite.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *
   * Available since NNAPI feature level 4.
   */
  int ANeuralNetworksCompilation_setTimeout(ANeuralNetworksCompilation* compilation,
                                            uint64_t duration) __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Create a {@link ANeuralNetworksExecution} to apply the given compilation.
   * This only creates the object. Computation is only performed once
   * {@link ANeuralNetworksExecution_burstCompute},
   * {@link ANeuralNetworksExecution_compute},
   * {@link ANeuralNetworksExecution_startCompute} or
   * {@link ANeuralNetworksExecution_startComputeWithDependencies} is invoked.
   *
   * <p>The provided compilation must outlive the execution.</p>
   *
   * See {@link ANeuralNetworksExecution} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 1.
   *
   * @param compilation The {@link ANeuralNetworksCompilation} to be evaluated.
   * @param execution The newly created object or NULL if unsuccessful.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful, ANEURALNETWORKS_BAD_DATA
   *         if the compilation is invalid.
   */
  int ANeuralNetworksExecution_create(ANeuralNetworksCompilation* compilation,
                                      ANeuralNetworksExecution** execution) __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Destroy an execution.
   *
   * <p>The execution need not have been scheduled by a call to
   * {@link ANeuralNetworksExecution_burstCompute},
   * {@link ANeuralNetworksExecution_compute},
   * {@link ANeuralNetworksExecution_startCompute} or
   * {@link ANeuralNetworksExecution_startComputeWithDependencies}; but if it has been scheduled,
   * then the application must not call {@link ANeuralNetworksExecution_free}
   * until the execution has completed (i.e.,
   * {@link ANeuralNetworksExecution_burstCompute},
   * {@link ANeuralNetworksExecution_compute}, or
   * {@link ANeuralNetworksEvent_wait} has returned).
   *
   * See {@link ANeuralNetworksExecution} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 1.
   *
   * @param execution The execution to be destroyed. Passing NULL is acceptable and
   *                  results in no operation.
   */
  void ANeuralNetworksExecution_free(ANeuralNetworksExecution* execution) __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Associate a user buffer with an input of the model of the
   * {@link ANeuralNetworksExecution}. Evaluation of the execution must not have
   * been scheduled. Once evaluation of the execution has been scheduled, the
   * application must not change the content of the buffer until the execution has
   * completed. Evaluation of the execution will not change the content of the
   * buffer.
   *
   * <p>The provided buffer must outlive the execution.</p>
   *
   * If the input is optional, you can indicate that it is omitted by
   * passing nullptr for buffer and 0 for length.
   *
   * Otherwise, if the user has not set the execution to accept padded input buffers by
   * calling {@link ANeuralNetworksExecution_enableInputAndOutputPadding}, then the length argument
   * must be equal to the raw size of the input (i.e. the size of an element multiplied by the
   * number of elements). Passing a length argument with value not equal to the raw size of the input
   * will result in ANEURALNETWORKS_BAD_DATA.
   *
   * Otherwise, if the user has set the execution to accept padded input buffers by calling
   * {@link ANeuralNetworksExecution_enableInputAndOutputPadding}, the length argument may be greater
   * than the raw size of the input, and the extra bytes at the end of the buffer may be used
   * by the driver to access data in chunks, for efficiency. Passing a length argument with value
   * less than the raw size of the input will result in ANEURALNETWORKS_BAD_DATA.
   *
   * This function may only be invoked when the execution is in the preparation state.
   *
   * See {@link ANeuralNetworksExecution} for information on execution states and multithreaded usage.
   * See {@link ANeuralNetworksCompilation_getPreferredMemoryAlignmentForInput} and
   * {@link ANeuralNetworksCompilation_getPreferredMemoryPaddingForInput} for information on getting
   * preferred buffer alignment and padding, to improve performance.
   *
   * Available since NNAPI feature level 1.
   *
   * @param execution The execution to be modified.
   * @param index The index of the input argument we are setting. It is
   *              an index into the lists passed to
   *              {@link ANeuralNetworksModel_identifyInputsAndOutputs}. It is not
   *              the index associated with
   *              {@link ANeuralNetworksModel_addOperand}.
   * @param type The {@link ANeuralNetworksOperandType} of the
   *             operand. Unless the input is omitted, this should be
   *             used to specify the dimensions that were left
   *             unspecified when the operand was added to the
   *             model. All other properties of the type must be the
   *             same as specified in the model. If the type is the same
   *             as specified when the model was built, NULL can be
   *             passed. Neither the {@link ANeuralNetworksOperandType}
   *             nor the dimensions it points to need to outlive the call
   *             to {@link ANeuralNetworksExecution_setInput}.
   * @param buffer The buffer containing the data.
   * @param length The size of the data value in bytes plus any end padding.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful, ANEURALNETWORKS_BAD_DATA if the
   *         name is not recognized or the buffer is too small for the input.
   */
  int ANeuralNetworksExecution_setInput(ANeuralNetworksExecution* execution, int32_t index,
                                        const ANeuralNetworksOperandType* type, const void* buffer,
                                        size_t length) __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Associate a region of a memory object with an input of the model of the
   * {@link ANeuralNetworksExecution}. Evaluation of the execution must not have
   * been scheduled. Once evaluation of the execution has been scheduled, the
   * application must not change the content of the region until the execution has
   * completed. Evaluation of the execution will not change the content of the
   * region.
   *
   * <p>The provided memory must outlive the execution.</p>
   *
   * If the input is optional, you can indicate that it is omitted by
   * using {@link ANeuralNetworksExecution_setInput} instead, passing nullptr for
   * buffer and 0 for length.
   *
   * If the memory is an AHardwareBuffer of a format other than AHARDWAREBUFFER_FORMAT_BLOB created
   * from {@link ANeuralNetworksMemory_createFromAHardwareBuffer}, or an opaque memory object created
   * from {@link ANeuralNetworksMemory_createFromDesc}, both offset and length must be 0, indicating
   * the whole memory is used.
   *
   * Otherwise, if the user has not set the execution to accept padded input memory objects by
   * calling {@link ANeuralNetworksExecution_enableInputAndOutputPadding}, then the length argument
   * must be equal to the raw size of the input (i.e. the size of an element multiplied by the
   * number of elements). Passing a length argument with value not equal to the raw size of the input
   * will result in ANEURALNETWORKS_BAD_DATA.
   *
   * Otherwise, if the user has set the execution to accept padded input memory objects by calling
   * {@link ANeuralNetworksExecution_enableInputAndOutputPadding}, the length argument may be greater
   * than the raw size of the input, and the extra bytes at the end of the memory region may be used
   * by the driver to access data in chunks, for efficiency. Passing a length argument with value
   * less than the raw size of the input will result in ANEURALNETWORKS_BAD_DATA.
   *
   * This function may only be invoked when the execution is in the preparation state.
   *
   * See {@link ANeuralNetworksExecution} for information on execution states and multithreaded usage.
   * See {@link ANeuralNetworksMemory_createFromAHardwareBuffer} for information on
   * AHardwareBuffer usage.
   * See {@link ANeuralNetworksMemory_createFromDesc} for information on usage of memory objects
   * created from memory descriptors.
   * See {@link ANeuralNetworksCompilation_getPreferredMemoryAlignmentForInput} and
   * {@link ANeuralNetworksCompilation_getPreferredMemoryPaddingForInput} for information on getting
   * preferred memory alignment and padding, to improve performance.
   *
   * Available since NNAPI feature level 1.
   *
   * @param execution The execution to be modified.
   * @param index The index of the input argument we are setting. It is
   *              an index into the lists passed to
   *              {@link ANeuralNetworksModel_identifyInputsAndOutputs}. It is not
   *              the index associated with {@link ANeuralNetworksModel_addOperand}.
   * @param type The {@link ANeuralNetworksOperandType} of the
   *             operand. This should be used to specify the dimensions
   *             that were left unspecified when the operand was added
   *             to the model. All other properties of the type must be
   *             the same as specified in the model. If the type is the
   *             same as specified when the model was built, NULL can be
   *             passed. Neither the {@link ANeuralNetworksOperandType}
   *             nor the dimensions it points to need to outlive the call
   *             to {@link ANeuralNetworksExecution_setInputFromMemory}.
   * @param memory The memory containing the data.
   * @param offset This specifies the location of the data within the memory.
   *               The offset is in bytes from the start of memory.
   * @param length The size of the data value in bytes plus any end padding.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful, ANEURALNETWORKS_BAD_DATA if the
   *         name is not recognized or the buffer is too small for the input.
   */
  int ANeuralNetworksExecution_setInputFromMemory(ANeuralNetworksExecution* execution, int32_t index,
                                                  const ANeuralNetworksOperandType* type,
                                                  const ANeuralNetworksMemory* memory, size_t offset,
                                                  size_t length) __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Associate a user buffer with an output of the model of the
   * {@link ANeuralNetworksExecution}. Evaluation of the execution must not have
   * been scheduled. Once evaluation of the execution has been scheduled, the
   * application must not change the content of the buffer until the execution has
   * completed.
   *
   * <p>The provided buffer must outlive the execution.</p>
   *
   * If the output is optional, you can indicate that it is omitted by
   * passing nullptr for buffer and 0 for length.
   *
   * Otherwise, if the user has not set the execution to accept padded output buffers by
   * calling {@link ANeuralNetworksExecution_enableInputAndOutputPadding}, then the length argument
   * must be equal to the raw size of the output (i.e. the size of an element multiplied by the
   * number of elements). Passing a length argument with value not equal to the raw size of the output
   * will result in ANEURALNETWORKS_BAD_DATA.
   *
   * Otherwise, if the user has set the execution to accept padded output buffers by calling
   * {@link ANeuralNetworksExecution_enableInputAndOutputPadding}, the length argument may be greater
   * than the raw size of the output, and the extra bytes at the end of the buffer may be used
   * by the driver to access data in chunks, for efficiency. Passing a length argument with value
   * less than the raw size of the output will result in ANEURALNETWORKS_BAD_DATA.
   *
   * This function may only be invoked when the execution is in the preparation state.
   *
   * See {@link ANeuralNetworksExecution} for information on execution states and multithreaded usage.
   * See {@link ANeuralNetworksCompilation_getPreferredMemoryAlignmentForOutput} and
   * {@link ANeuralNetworksCompilation_getPreferredMemoryPaddingForOutput} for information on getting
   * preferred buffer alignment and padding, to improve performance.
   *
   * Available since NNAPI feature level 1.
   *
   * @param execution The execution to be modified.
   * @param index The index of the output argument we are setting. It is
   *              an index into the lists passed to
   *              {@link ANeuralNetworksModel_identifyInputsAndOutputs}. It is not
   *              the index associated with {@link ANeuralNetworksModel_addOperand}.
   * @param type The {@link ANeuralNetworksOperandType} of the
   *             operand. Unless the output is omitted, this should be
   *             used to specify the dimensions that were left
   *             unspecified when the operand was added to the
   *             model. All other properties of the type must be the
   *             same as specified in the model. If the type is the same
   *             as specified when the model was built, NULL can be
   *             passed. Neither the {@link ANeuralNetworksOperandType}
   *             nor the dimensions it points to need to outlive the call
   *             to {@link ANeuralNetworksExecution_setOutput}.
   *             Since NNAPI feature level 3, the output operand can have unspecified
   *             dimensions or rank to be deduced dynamically during the execution.
   *             However, the user must provide a large enough buffer. The user
   *             can retrieve the output dimensional information after the execution
   *             by {@link ANeuralNetworksExecution_getOutputOperandRank} and
   *             {@link ANeuralNetworksExecution_getOutputOperandDimensions}.
   * @param buffer The buffer where the data is to be written.
   * @param length The size of the data value in bytes plus any end padding.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful, ANEURALNETWORKS_BAD_DATA if the
   *         name is not recognized or the buffer is too small for the output.
   */
  int ANeuralNetworksExecution_setOutput(ANeuralNetworksExecution* execution, int32_t index,
                                         const ANeuralNetworksOperandType* type, void* buffer,
                                         size_t length) __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Associate a region of a memory object with an output of the model of the
   * {@link ANeuralNetworksExecution}. Evaluation of the execution must not have
   * been scheduled. Once evaluation of the execution has been scheduled, the
   * application must not change the content of the region until the execution has
   * completed.
   *
   * <p>The provided memory must outlive the execution.</p>
   *
   * If the output is optional, you can indicate that it is omitted by
   * using {@link ANeuralNetworksExecution_setOutput} instead, passing nullptr for
   * buffer and 0 for length.
   *
   * If the memory is an AHardwareBuffer of a format other than AHARDWAREBUFFER_FORMAT_BLOB created
   * from {@link ANeuralNetworksMemory_createFromAHardwareBuffer}, or an opaque memory object created
   * from {@link ANeuralNetworksMemory_createFromDesc}, both offset and length must be 0, indicating
   * the whole memory is used.
   *
   * Otherwise, if the user has not set the execution to accept padded output memory objects by
   * calling {@link ANeuralNetworksExecution_enableInputAndOutputPadding}, then the length argument
   * must be equal to the raw size of the output (i.e. the size of an element multiplied by the
   * number of elements). Passing a length argument with value not equal to the raw size of the output
   * will result in ANEURALNETWORKS_BAD_DATA.
   *
   * Otherwise, if the user has set the execution to accept padded output memory objects by calling
   * {@link ANeuralNetworksExecution_enableInputAndOutputPadding}, the length argument may be greater
   * than the raw size of the output, and the extra bytes at the end of the memory region may be used
   * by the driver to access data in chunks, for efficiency. Passing a length argument with value
   * less than the raw size of the output will result in ANEURALNETWORKS_BAD_DATA.
   *
   * This function may only be invoked when the execution is in the preparation state.
   *
   * See {@link ANeuralNetworksExecution} for information on execution states and multithreaded usage.
   * See {@link ANeuralNetworksMemory_createFromAHardwareBuffer} for information on
   * AHardwareBuffer usage.
   * See {@link ANeuralNetworksMemory_createFromDesc} for information on usage of memory objects
   * created from memory descriptors.
   * See {@link ANeuralNetworksCompilation_getPreferredMemoryAlignmentForOutput} and
   * {@link ANeuralNetworksCompilation_getPreferredMemoryPaddingForOutput} for information on getting
   * preferred memory alignment and padding, to improve performance.
   *
   * Available since NNAPI feature level 1.
   *
   * @param execution The execution to be modified.
   * @param index The index of the output argument we are setting. It is
   *              an index into the lists passed to
   *              {@link ANeuralNetworksModel_identifyInputsAndOutputs}. It is not
   *              the index associated with {@link ANeuralNetworksModel_addOperand}.
   * @param type The {@link ANeuralNetworksOperandType} of the operand. This should be
   *             used to specify the dimensions that were left
   *             unspecified when the operand was added to the
   *             model. All other properties of the type must be the
   *             same as specified in the model. If the type is the same
   *             as specified when the model was built, NULL can be
   *             passed. Neither the {@link ANeuralNetworksOperandType}
   *             nor the dimensions it points to need to outlive the call
   *             to {@link ANeuralNetworksExecution_setOutputFromMemory}.
   *             Since NNAPI feature level 3, the output operand can have unspecified
   *             dimensions or rank to be deduced dynamically during the execution.
   *             However, the user must provide a large enough memory. The user
   *             can retrieve the output dimensional information after the execution
   *             by {@link ANeuralNetworksExecution_getOutputOperandRank} and
   *             {@link ANeuralNetworksExecution_getOutputOperandDimensions}.
   * @param memory The memory where the data is to be stored.
   * @param offset This specifies the location of the data within the memory.
   *               The offset is in bytes from the start of memory.
   * @param length The size of the data value in bytes plus any end padding.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful, ANEURALNETWORKS_BAD_DATA if the
   *         name is not recognized or the buffer is too small for the output.
   */
  int ANeuralNetworksExecution_setOutputFromMemory(ANeuralNetworksExecution* execution, int32_t index,
                                                   const ANeuralNetworksOperandType* type,
                                                   const ANeuralNetworksMemory* memory, size_t offset,
                                                   size_t length) __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Schedule asynchronous evaluation of the execution.
   *
   * <p>Schedules asynchronous evaluation of the execution. Once the execution
   * has completed and the outputs are ready to be consumed, the returned event
   * will be signaled. Use {@link ANeuralNetworksEvent_wait} to wait for that
   * event.
   * </p>
   *
   * ANeuralNetworksEvent_wait must be called to recuperate the resources used
   * by the execution.
   *
   * If {@link ANeuralNetworksExecution_setTimeout} was called on this execution,
   * and the execution is not able to complete before the timeout duration is
   * exceeded, then execution may be aborted, in which case
   * ANEURALNETWORKS_MISSED_DEADLINE_* {@link ResultCode} will be returned through
   * {@link ANeuralNetworksExecution_startCompute} or
   * {@link ANeuralNetworksEvent_wait} on the event object. If the device has a
   * feature level reported by {@link ANeuralNetworksDevice_getFeatureLevel} that
   * is lower than {@link ANEURALNETWORKS_FEATURE_LEVEL_4}, then the timeout
   * duration hint will be ignored.
   *
   * If this execution contains a {@link ANEURALNETWORKS_WHILE} operation, and
   * the condition model does not output false within the loop timeout duration,
   * then execution will be aborted and ANEURALNETWORKS_MISSED_DEADLINE_* {@link ResultCode}
   * will be returned through {@link ANeuralNetworksEvent_wait} on the event
   * object.
   *
   * If the device can detect before the execution has started that the execution
   * will not complete within the timeout duration, the device may choose to skip
   * the execution and instead return ANEURALNETWORKS_MISSED_DEADLINE_* {@link ResultCode}.
   *
   * Before NNAPI feature level 5, this function may only be invoked when the execution is in the
   * preparation state. Starting at NNAPI feature level 5, if the user sets the execution to be
   * reusable by {@link ANeuralNetworksExecution_setReusable}, this function may also be invoked when
   * the execution is in the completed state.
   *
   * See {@link ANeuralNetworksExecution} for information on execution states and multithreaded usage.
   *
   * See {@link ANeuralNetworksExecution_compute} for synchronous execution.
   * See {@link ANeuralNetworksExecution_burstCompute} for burst synchronous execution.
   * See {@link ANeuralNetworksExecution_startComputeWithDependencies} for
   * asynchronous execution with dependencies.
   *
   * Available since NNAPI feature level 1.
   *
   * @param execution The execution to be scheduled and executed.
   * @param event The event that will be signaled on completion. event is set to
   *              NULL if there's an error.
   *
   * @return ANEURALNETWORKS_NO_ERROR if the evaluation is successfully scheduled.
   */
  int ANeuralNetworksExecution_startCompute(ANeuralNetworksExecution* execution,
                                            ANeuralNetworksEvent** event) __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Set the maximum expected duration of the specified execution.
   *
   * If the device is not able to complete the execution within the specified
   * duration, the execution may be aborted. The timeout duration begins at a
   * call to one of:
   * - {@link ANeuralNetworksExecution_burstCompute}
   * - {@link ANeuralNetworksExecution_compute}
   * - {@link ANeuralNetworksExecution_startCompute}
   * - {@link ANeuralNetworksExecution_startComputeWithDependencies}
   *
   * This timeout duration acts as a hint to drivers, and can be used to both free
   * up compute resources within the driver and return control back to the
   * application quicker than is possible without the hint. It enables drivers
   * that are able to estimate how long an execution will take to abort the
   * execution before it has even started if the driver believes the execution
   * cannot be completed within the timeout duration. Similarly, it enables
   * drivers to abort an ongoing execution if it is taking too long. However, this
   * call does not guarantee that the execution will complete or abort within the
   * timeout duration.
   *
   * By default (i.e., unless ANeuralNetworksExecution_setTimeout is called),
   * the timeout duration for execution is considered infinite.
   *
   * The {@link ANeuralNetworksExecution} must have been created from an
   * {@link ANeuralNetworksCompilation} which in turn was created from
   * {@link ANeuralNetworksCompilation_createForDevices} with numDevices = 1,
   * otherwise this function will fail with ANEURALNETWORKS_BAD_DATA. If the
   * device has a feature level reported by
   * {@link ANeuralNetworksDevice_getFeatureLevel} that is lower than
   * {@link ANEURALNETWORKS_FEATURE_LEVEL_4}, then the timeout duration hint will
   * be ignored.
   *
   * This function may only be invoked when the execution is in the preparation state.
   *
   * See {@link ANeuralNetworksExecution} for information on execution states and multithreaded usage.
   *
   * @param execution The execution to be modified.
   * @param duration The maximum amount of time in nanoseconds that is expected to
   *     be spent executing a model. If this duration is exceeded, the execution
   *     may be aborted. If set to 0, the timeout duration is considered infinite.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *
   * Available since NNAPI feature level 4.
   */
  int ANeuralNetworksExecution_setTimeout(ANeuralNetworksExecution* execution, uint64_t duration)
          __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Set the maximum duration of WHILE loops in the specified execution.
   *
   * This is a fuzzy per-loop timeout intended to prevent infinite loops.
   *
   * If a WHILE loop condition model does not output false within the specified
   * duration, the execution will be aborted.
   *
   * See {@link ANeuralNetworks_getDefaultLoopTimeout} and
   * {@link ANeuralNetworks_getMaximumLoopTimeout} for the default
   * and maximum timeout values.
   *
   * This function may only be invoked when the execution is in the preparation state.
   *
   * See {@link ANeuralNetworksExecution} for information on execution states and multithreaded usage.
   *
   * @param execution The execution to be modified.
   * @param duration The maximum amount of time in nanoseconds that can be spent
   *     executing a WHILE loop. If the specified duration value exceeds the value
   *     produced by {@link ANeuralNetworks_getMaximumLoopTimeout}, it will be
   *     overridden by that value.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *         ANEURALNETWORKS_BAD_STATE if execution has started.
   *         ANEURALNETWORKS_UNEXPECTED_NULL if execution is NULL.
   *
   * Available since NNAPI feature level 4.
   */
  int ANeuralNetworksExecution_setLoopTimeout(ANeuralNetworksExecution* execution, uint64_t duration)
          __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Get the default timeout value for WHILE loops.
   *
   * @return The default timeout value in nanoseconds.
   *
   * Available since NNAPI feature level 4.
   */
  uint64_t ANeuralNetworks_getDefaultLoopTimeout() __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Get the maximum timeout value for WHILE loops.
   *
   * @return The maximum timeout value in nanoseconds.
   *
   * Available since NNAPI feature level 4.
   */
  uint64_t ANeuralNetworks_getMaximumLoopTimeout() __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Waits until the execution completes.
   *
   * More than one thread can wait on an event. When the execution completes,
   * all threads will be released.
   *
   * If {@link ANeuralNetworksExecution_setTimeout} was called on the execution
   * corresponding to this event, and the execution is not able to complete
   * before the duration is exceeded, the execution may be aborted, in which case
   * ANEURALNETWORKS_MISSED_DEADLINE_* {@link ResultCode} will be returned here.
   *
   * If the execution contains a {@link ANEURALNETWORKS_WHILE} operation, and
   * the condition model does not output false within the loop timeout duration,
   * the execution will be aborted, and ANEURALNETWORKS_MISSED_DEADLINE_* {@link ResultCode}
   * will be returned here.
   *
   * See {@link ANeuralNetworksExecution} for information on execution states and multithreaded usage.
   *
   * Available since NNAPI feature level 1.
   *
   * @param event The event that will be signaled on completion.
   * @return ANEURALNETWORKS_NO_ERROR if the execution completed normally.
   *         ANEURALNETWORKS_UNMAPPABLE if the execution input or output memory cannot
   *         be properly mapped.
   */
  int ANeuralNetworksEvent_wait(ANeuralNetworksEvent* event) __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Destroys the event.
   *
   * See {@link ANeuralNetworksExecution} for information on multithreaded usage.
   *
   * Available since NNAPI feature level 1.
   *
   * @param event The event object to be destroyed. Passing NULL is acceptable and
   *              results in no operation.
   */
  void ANeuralNetworksEvent_free(ANeuralNetworksEvent* event) __NNAPI_INTRODUCED_IN(27);
  
  /**
   * Create a {@link ANeuralNetworksEvent} from a sync_fence file descriptor.
   *
   * The newly created ANeuralNetworksEvent does not take ownership of the provided sync_fence_fd,
   * it will instead dup the provided sync_fence_fd and own the duplicate.
   *
   * @param sync_fence_fd The sync_fence file descriptor.
   * @param event The newly created object or NULL if unsuccessful.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *
   * Available since NNAPI feature level 4.
   */
  int ANeuralNetworksEvent_createFromSyncFenceFd(int sync_fence_fd, ANeuralNetworksEvent** event)
          __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Get sync_fence file descriptor from the event.
   *
   * If the ANeuralNetworksEvent is not backed by a sync fence, the sync_fence_fd
   * will be set to -1, and ANEURALNETWORKS_BAD_DATA will be returned.
   *
   * See {@link ANeuralNetworksEvent_createFromSyncFenceFd} and
   * {@link ANeuralNetworksExecution_startComputeWithDependencies} to see how to create
   * an event backed by a sync fence.
   *
   * The user takes ownership of the returned fd, and must close the returned file descriptor when
   * it is no longer needed.
   *
   * @param event An event that is backed by a sync fence.
   * @param sync_fence_fd The sync_fence file descriptor. The file descriptor will
   *                      be set to -1 if there is an error.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *
   * Available since NNAPI feature level 4.
   */
  int ANeuralNetworksEvent_getSyncFenceFd(const ANeuralNetworksEvent* event, int* sync_fence_fd)
          __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Schedule asynchronous evaluation of the execution with dependencies.
   *
   * The execution will wait for all the depending events to be signaled before
   * starting the evaluation. Once the execution has completed and the outputs
   * are ready to be consumed, the returned event will be signaled. Depending on which
   * devices are handling the execution, the event could be backed by a sync fence.
   * Use {@link ANeuralNetworksEvent_wait} to wait for that event.
   *
   * ANeuralNetworksEvent_wait must be called to recurperate the resources used
   * by the execution.
   *
   * If parts of the execution are scheduled on devices that do not support fenced execution,
   * the function call may wait for such parts to finish before returning.
   *
   * The function will return an error if any of the events in dependencies is already in a bad
   * state. After the execution is scheduled, if any of the events in dependencies does not complete
   * normally, the execution will fail, and {@link ANeuralNetworksEvent_wait} on the returned
   * event will return an error.
   *
   * The function will return an error if any of the execution outputs has a tensor operand type
   * that is not fully specified.
   *
   * The function can be passed a timeout duration in nanoseconds. This timeout
   * duration acts as a hint to drivers in the same way that the timeout durations
   * in {@link ANeuralNetworksCompilation_setTimeout} and {@link
   * ANeuralNetworksExecution_setTimeout} act as hints to drivers. The duration
   * begins when all waitFor sync fences have been signaled, and can be used
   * together with {@link ANeuralNetworksExecution_setTimeout} which specifies the
   * maximum timeout duration beginning at the call to
   * {@link ANeuralNetworksExecution_startComputeWithDependencies}.
   * If the duration is non-zero, the {@link ANeuralNetworksExecution} must have been created
   * from an {@link ANeuralNetworksCompilation} which in turn was created from
   * {@link ANeuralNetworksCompilation_createForDevices} with numDevices = 1,
   * otherwise this function will fail with ANEURALNETWORKS_BAD_DATA. If either
   * the timeout duration from {@link ANeuralNetworksExecution_setTimeout} or the
   * timeout duration passed to this call is exceeded, the execution may be
   * aborted, in which case ANEURALNETWORKS_MISSED_DEADLINE_* {@link ResultCode} will be
   * returned through {@link ANeuralNetworksExecution_startComputeWithDependencies}
   * or {@link ANeuralNetworksEvent_wait} on the event object. If the device has a
   * feature level reported by {@link ANeuralNetworksDevice_getFeatureLevel} that
   * is lower than {@link ANEURALNETWORKS_FEATURE_LEVEL_4}, then the timeout duration
   * hints will be ignored.
   *
   * If this execution contains a {@link ANEURALNETWORKS_WHILE} operation, and
   * the condition model does not output false within the loop timeout duration,
   * then execution will be aborted and ANEURALNETWORKS_MISSED_DEADLINE_* {@link ResultCode}
   * will be returned through {@link ANeuralNetworksEvent_wait} on the event
   * object.
   *
   * Before NNAPI feature level 5, this function may only be invoked when the execution is in the
   * preparation state. Starting at NNAPI feature level 5, if the user sets the execution to be
   * reusable by {@link ANeuralNetworksExecution_setReusable}, this function may also be invoked when
   * the execution is in the completed state.
   *
   * See {@link ANeuralNetworksExecution} for information on execution states and multithreaded usage.
   *
   * See {@link ANeuralNetworksExecution_compute} for synchronous execution.
   * See {@link ANeuralNetworksExecution_burstCompute} for burst synchronous execution.
   * See {@link ANeuralNetworksExecution_startCompute} for regular asynchronous execution.
   *
   * @param execution The execution to be scheduled and executed.
   * @param dependencies A set of depending events. The actual evaluation will not start
   *                     until all the events are signaled.
   * @param num_dependencies The number of events in the dependencies set.
   * @param duration The maximum amount of time in nanoseconds that is expected to
   *                 be spent executing the model after all dependencies are
   *                 signaled. If set to 0, the timeout duration is considered
   *                 infinite.
   * @param event The event that will be signaled on completion. event is set to
   *              NULL if there's an error.
   *
   * @return ANEURALNETWORKS_NO_ERROR if the evaluation is successfully scheduled.
   *
   * Available since NNAPI feature level 4.
   */
  int ANeuralNetworksExecution_startComputeWithDependencies(
          ANeuralNetworksExecution* execution, const ANeuralNetworksEvent* const* dependencies,
          uint32_t num_dependencies, uint64_t duration, ANeuralNetworksEvent** event)
          __NNAPI_INTRODUCED_IN(30);
  
  /**
   * Get the NNAPI runtime feature level.
   *
   * Since API level 31 (NNAPI feature level 5), the NNAPI runtime (libneuralnetworks.so) and its
   * API specification can be updated between Android API releases.
   *
   * On Android devices with API level 31 and newer, for NNAPI runtime feature discovery,
   * the NNAPI runtime feature level must be used instead of the Android device API level.
   *
   * On Android devices with API level 30 and older, the Android API level of the Android
   * device must be used for NNAPI runtime feature discovery. Enum values in
   * {@link FeatureLevelCode} from feature level 1 to 5 have their corresponding Android
   * API levels listed in their documentation, and each such enum value equals the corresponding
   * API level. This allows using the Android API level as the feature level.
   * This mapping between enum value and Android API level does not exist for feature levels
   * after NNAPI feature level 5 and API levels after S (31).
   *
   * Example usage:
   * int device_api_level = android_get_device_api_level();
   * int64_t runtime_feature_level = (device_api_level < __ANDROID_API_S__) ?
   *                                  device_api_level : ANeuralNetworks_getRuntimeFeatureLevel();
   *
   * Runtime feature level is closely related to NNAPI device feature level
   * ({@link ANeuralNetworksDevice_getFeatureLevel}), which indicates an NNAPI device feature level
   * (the most advanced NNAPI specification and features that the driver implements).
   * This function expresses NNAPI runtime feature level, which indicates the most advanced
   * NNAPI specification and features the runtime implements. An NNAPI device feature level is
   * always less than or equal to the runtime feature level.
   *
   * This function returns a {@link FeatureLevelCode} enum value,
   * which is the NNAPI specification version that this NNAPI runtime implements.
   * It is NOT an Android API level.
   *
   * Available since NNAPI feature level 5.
   */
  int64_t ANeuralNetworks_getRuntimeFeatureLevel() __NNAPI_INTRODUCED_IN(31);
  
  /**
   * Specifies whether the {@link ANeuralNetworksExecution} is able to accept padded input and output
   * buffers and memory objects.
   *
   * By default, the input and output buffers and memory objects of {@link ANeuralNetworksExecution}
   * do not allow padding.
   *
   * Setting the execution to accept padded input and output buffers and memory objects enables the
   * length argument of {@link ANeuralNetworksExecution_setInput},
   * {@link ANeuralNetworksExecution_setInputFromMemory}, {@link ANeuralNetworksExecution_setOutput},
   * and {@link ANeuralNetworksExecution_setOutputFromMemory} to be greater than the raw size of the
   * operand (i.e. the size of an element multiplied by the number of elements). The extra bytes
   * at the end of the buffer or memory region may be used by the driver to access data in chunks,
   * for efficiency.
   *
   * This method must not be called after {@link ANeuralNetworksExecution_setInput},
   * {@link ANeuralNetworksExecution_setInputFromMemory}, {@link ANeuralNetworksExecution_setOutput},
   * or {@link ANeuralNetworksExecution_setOutputFromMemory}.
   *
   * See {@link ANeuralNetworksExecution} for information on multithreaded usage.
   *
   * @param execution The execution to be modified.
   * @param enable 'true' if the execution is to be able to accept padded input and output buffers
   *               and memory objects, 'false' if not.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *         ANEURALNETWORKS_UNEXPECTED_NULL if execution is NULL.
   *         ANEURALNETWORKS_BAD_STATE if {@link ANeuralNetworksExecution_setInput},
   *         {@link ANeuralNetworksExecution_setInputFromMemory},
   *         {@link ANeuralNetworksExecution_setOutput}, or
   *         {@link ANeuralNetworksExecution_setOutputFromMemory} has been called on the execution.
   *
   * Available since NNAPI feature level 5.
   */
  int ANeuralNetworksExecution_enableInputAndOutputPadding(ANeuralNetworksExecution* execution,
                                                           bool enable) __NNAPI_INTRODUCED_IN(31);
  
  /**
   * Get the preferred buffer and memory alignment of an input to an execution created from a
   * particular compilation.
   *
   * The user may use the returned alignment value to guide the layout of the input buffer or memory
   * pool. To achieve the best performance, make sure the address of the buffer passed in
   * {@link ANeuralNetworksExecution_setInput}, or the offset value passed in
   * {@link ANeuralNetworksExecution_setInputFromMemory}, is a multiple of the perferred alignment
   * value of the same input. A driver may choose to allocate a separate buffer and do memory copying
   * if the provided buffer or memory does not satisfy the preferred alignment.
   *
   * See {@link ANeuralNetworksCompilation} for information on multithreaded usage.
   *
   * @param compilation The compilation object. It must already have been finished by calling
   *                    {@link ANeuralNetworksCompilation_finish}.
   * @param index The index of the input argument we are referencing from the compilation. It is
   *              an index into the inputs list passed to
   *              {@link ANeuralNetworksModel_identifyInputsAndOutputs}. It is not
   *              the index associated with {@link ANeuralNetworksModel_addOperand}.
   * @param alignment The returned preferred alignment in bytes. It will be a power of 2.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *         ANEURALNETWORKS_UNEXPECTED_NULL if either compilation or alignment is NULL.
   *         ANEURALNETWORKS_BAD_STATE if the compilation has not been finished.
   *         ANEURALNETWORKS_BAD_DATA if the index is out of range.
   *
   * Available since NNAPI feature level 5.
   */
  int ANeuralNetworksCompilation_getPreferredMemoryAlignmentForInput(
          const ANeuralNetworksCompilation* compilation, uint32_t index, uint32_t* alignment)
          __NNAPI_INTRODUCED_IN(31);
  
  /**
   * Get the preferred buffer and memory end padding of an input to an execution created from a
   * particular compilation.
   *
   * The user may use the returned padding value to guide the layout of the input buffer or memory
   * pool. To achieve the best performance, make sure the length value passed in
   * {@link ANeuralNetworksExecution_setInput} or
   * {@link ANeuralNetworksExecution_setInputFromMemory} is greater than or equal to the raw size of
   * the input (i.e. the size of an element multiplied by the number of elements) rounding up to
   * a multiple of the perferred padding value of the same input. A driver may choose to allocate a
   * separate buffer and do memory copying if the provided buffer or memory value does not satisfy
   * the preferred padding.
   *
   * See {@link ANeuralNetworksCompilation} for information on multithreaded usage.
   * See {@link ANeuralNetworksExecution_enableInputAndOutputPadding},
   * {@link ANeuralNetworksExecution_setInput}, and
   * {@link ANeuralNetworksExecution_setInputFromMemory} for information on passing
   * input buffer or memory padding to the driver.
   *
   * @param compilation The compilation object. It must already have been finished by calling
   *                    {@link ANeuralNetworksCompilation_finish}.
   * @param index The index of the input argument we are referencing from the compilation. It is
   *              an index into the inputs list passed to
   *              {@link ANeuralNetworksModel_identifyInputsAndOutputs}. It is not
   *              the index associated with {@link ANeuralNetworksModel_addOperand}.
   * @param padding The returned preferred padding in bytes. It will be a power of 2.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *         ANEURALNETWORKS_UNEXPECTED_NULL if either compilation or padding is NULL.
   *         ANEURALNETWORKS_BAD_STATE if the compilation has not been finished.
   *         ANEURALNETWORKS_BAD_DATA if the index is out of range.
   *
   * Available since NNAPI feature level 5.
   */
  int ANeuralNetworksCompilation_getPreferredMemoryPaddingForInput(
          const ANeuralNetworksCompilation* compilation, uint32_t index, uint32_t* padding)
          __NNAPI_INTRODUCED_IN(31);
  
  /**
   * Get the preferred buffer and memory alignment of an output to an execution created from a
   * particular compilation.
   *
   * The user may use the returned alignment value to guide the layout of the output buffer or memory
   * pool. To achieve the best performance, make sure the address of the buffer passed in
   * {@link ANeuralNetworksExecution_setOutput}, or the offset value passed in
   * {@link ANeuralNetworksExecution_setOutputFromMemory}, is a multiple of the perferred alignment
   * value of the same output. A driver may choose to allocate a separate buffer and do memory copying
   * if the provided buffer or memory does not satisfy the preferred alignment.
   *
   * See {@link ANeuralNetworksCompilation} for information on multithreaded usage.
   *
   * @param compilation The compilation object. It must already have been finished by calling
   *                    {@link ANeuralNetworksCompilation_finish}.
   * @param index The index of the output argument we are referencing from the compilation. It is
   *              an index into the outputs list passed to
   *              {@link ANeuralNetworksModel_identifyInputsAndOutputs}. It is not
   *              the index associated with {@link ANeuralNetworksModel_addOperand}.
   * @param alignment The returned perferred alignment in bytes. It will be a power of 2.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *         ANEURALNETWORKS_UNEXPECTED_NULL if either compilation or alignment is NULL.
   *         ANEURALNETWORKS_BAD_STATE if the compilation has not been finished.
   *         ANEURALNETWORKS_BAD_DATA if the index is out of range.
   *
   * Available since NNAPI feature level 5.
   */
  int ANeuralNetworksCompilation_getPreferredMemoryAlignmentForOutput(
          const ANeuralNetworksCompilation* compilation, uint32_t index, uint32_t* alignment)
          __NNAPI_INTRODUCED_IN(31);
  
  /**
   * Get the preferred memory end padding of an output to an execution created from a particular
   * compilation.
   *
   * The user may use the returned padding value to guide the layout of the output buffer or memory
   * pool. To achieve the best performance, make sure the length value passed in
   * {@link ANeuralNetworksExecution_setOutput} or
   * {@link ANeuralNetworksExecution_setOutputFromMemory} is greater than or equal to the raw size of
   * the output (i.e. the size of an element multiplied by the number of elements) rounding up to
   * a multiple of the perferred padding value of the same output. A driver may choose to allocate a
   * separate buffer and do memory copying if the provided buffer or memory value does not satisfy
   * the preferred padding.
   *
   * See {@link ANeuralNetworksCompilation} for information on multithreaded usage.
   * See {@link ANeuralNetworksExecution_enableInputAndOutputPadding},
   * {@link ANeuralNetworksExecution_setOutput}, and
   * {@link ANeuralNetworksExecution_setOutputFromMemory} for information on passing
   * output buffer or memory padding to the driver.
   *
   * @param compilation The compilation object. It must already have been finished by calling
   *                    {@link ANeuralNetworksCompilation_finish}.
   * @param index The index of the output argument we are referencing from the compilation. It is
   *              an index into the outputs list passed to
   *              {@link ANeuralNetworksModel_identifyInputsAndOutputs}. It is not
   *              the index associated with {@link ANeuralNetworksModel_addOperand}.
   * @param padding The returned perferred padding in bytes. It will be a power of 2.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *         ANEURALNETWORKS_UNEXPECTED_NULL if either compilation or padding is NULL.
   *         ANEURALNETWORKS_BAD_STATE if the compilation has not been finished.
   *         ANEURALNETWORKS_BAD_DATA if the index is out of range.
   *
   * Available since NNAPI feature level 5.
   */
  int ANeuralNetworksCompilation_getPreferredMemoryPaddingForOutput(
          const ANeuralNetworksCompilation* compilation, uint32_t index, uint32_t* padding)
          __NNAPI_INTRODUCED_IN(31);
  
  /**
   * Specifies whether the {@link ANeuralNetworksExecution} can be reused for multiple computations.
   *
   * By default, the {@link ANeuralNetworksExecution} is not reusable.
   *
   * Setting the execution to be reusable enables multiple computations to be scheduled and evaluated
   * on the same execution sequentially, either by means of
   * {@link ANeuralNetworksExecution_burstCompute}, {@link ANeuralNetworksExecution_compute},
   * {@link ANeuralNetworksExecution_startCompute} or
   * {@link ANeuralNetworksExecution_startComputeWithDependencies}: The application may schedule and
   * evaluate a computation again from the completed state of a reusable execution.
   *
   * This function may only be invoked when the execution is in the preparation state.
   *
   * See {@link ANeuralNetworksExecution} for information on execution states and multithreaded usage.
   *
   * @param execution The execution to be modified.
   * @param reusable 'true' if the execution is to be reusable, 'false' if not.
   *
   * @return ANEURALNETWORKS_NO_ERROR if successful.
   *         ANEURALNETWORKS_UNEXPECTED_NULL if execution is NULL.
   *         ANEURALNETWORKS_BAD_STATE if the execution is not in the preparation state.
   *
   * Available since NNAPI feature level 5.
   */
  int ANeuralNetworksExecution_setReusable(ANeuralNetworksExecution* execution, bool reusable)
          __NNAPI_INTRODUCED_IN(31);
  
  __END_DECLS
  
  #endif  // ANDROID_FRAMEWORKS_ML_NN_RUNTIME_NEURAL_NETWORKS_H
  
  #undef __NNAPI_INTRODUCED_IN
  
  /** @} */
  