text: /**
   * \file imperative/src/include/megbrain/imperative/interpreter.h
   * MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
   *
   * Copyright (c) 2014-2020 Megvii Inc. All rights reserved.
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   */
  
  #include <atomic>
  
  #include "megbrain/imperative/op_def.h"
  
  namespace mgb::imperative::interpreter {
  
  struct Interpreter {
      using Handle = void*;
  
      struct Channel {
          virtual ~Channel() = default;
  
          virtual Handle put(const HostTensorND& value, bool no_cache) = 0;
          virtual Handle put(const DeviceTensorND& value) = 0;
  
          virtual void del(Handle) = 0;
          virtual void swap_in(Handle) = 0;
          virtual void swap_out(Handle) = 0;
          virtual void drop(Handle) = 0;
  
          virtual SmallVector<Handle> apply_op(
                  std::shared_ptr<OpDef> op,
                  const SmallVector<Handle>& inputs) = 0;
  
          virtual HostTensorND get_value(Handle) = 0;
          virtual TensorShape get_shape(Handle) = 0;
          virtual DType get_dtype(Handle) = 0;
          virtual CompNode get_device(Handle) = 0;
  
          virtual DeviceTensorND get_dev_tensor(Handle) = 0;
  
          virtual void sync() = 0;
          virtual void close() = 0;
          virtual void set_swap_flag(bool) = 0;
          virtual void set_drop_flag(bool) = 0;
          virtual void set_buffer_length(int) = 0;
  
          virtual void config_async_level(int level) = 0;
          virtual int get_async_level() = 0;
      };
  
      virtual std::unique_ptr<Channel> create_channel() = 0;
  
      static Interpreter& inst();
  };
  
  } // namespace mgb::imperative::interpreter
  