text: // Copyright 2018 Xiaomi, Inc.  All rights reserved.
  //
  // 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.
  
  #ifndef MACE_OPS_SPACE_TO_DEPTH_H_
  #define MACE_OPS_SPACE_TO_DEPTH_H_
  
  #include <memory>
  #include <vector>
  
  #include "mace/core/operator.h"
  #include "mace/kernels/depth_to_space.h"
  
  namespace mace {
  namespace ops {
  
  template <DeviceType D, typename T>
  class SpaceToDepthOp : public Operator<D, T> {
   public:
    SpaceToDepthOp(const OperatorDef &op_def, Workspace *ws)
        : Operator<D, T>(op_def, ws),
          functor_(OperatorBase::GetOptionalArg<int>("block_size", 1), false) {}
  
    MaceStatus Run(StatsFuture *future) override {
      const Tensor *input = this->Input(INPUT);
      Tensor *output = this->Output(OUTPUT);
      MACE_CHECK(input->dim_size() == 4, "input dim should be 4");
      const int block_size = OperatorBase::GetOptionalArg<int>("block_size", 1);
      index_t input_height;
      index_t input_width;
      index_t input_depth;
      if (D == CPU) {
        input_height = input->dim(2);
        input_width = input->dim(3);
        input_depth = input->dim(1);
      } else if (D == GPU) {
        input_height = input->dim(1);
        input_width = input->dim(2);
        input_depth = input->dim(3);
      } else {
        MACE_NOT_IMPLEMENTED;
      }
      MACE_CHECK((input_depth % 4) == 0,
                 "input channel should be dividable by 4");
      MACE_CHECK(
          (input_width % block_size == 0) && (input_height % block_size == 0),
          "input width and height should be dividable by block_size",
          input->dim(3));
      return functor_(input, output, future);
    }
  
   protected:
    MACE_OP_INPUT_TAGS(INPUT);
    MACE_OP_OUTPUT_TAGS(OUTPUT);
  
   private:
    kernels::DepthToSpaceOpFunctor<D, T> functor_;
  };
  
  }  // namespace ops
  }  // namespace mace
  
  #endif  // MACE_OPS_SPACE_TO_DEPTH_H_
  