concat_op.cpp

/* Copyright (c) 2016 Baidu, Inc. All Rights Reserved.
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==============================================================================*/

#include "concat_op.h"

namespace paddle_mobile {
namespace operators {

template <typename Dtype, typename T>
void ConcatOp<Dtype, T>::InferShape() const {
  auto inputs = param_.Inputs();
  const size_t n = inputs.size();

  std::vector<DDim> inputs_dims;
  inputs_dims.reserve(n);
  for (int i = 0; i < n; i++) {
    inputs_dims.push_back(inputs[i]->dims());
  }

  auto axis = static_cast<size_t>(param_.Axis());

  if (n == 1) {
    DLOG << "Warning: concat op have only one input, "
            "may waste memory";
  }

  /// add all dim[axis] and check other dims if equal.
  auto out_dims = inputs_dims[0];
  int in_zero_dims_size = out_dims.size();
  for (size_t i = 1; i < n; i++) {
    for (size_t j = 0; j < in_zero_dims_size; j++) {
      if (j == axis) {
        out_dims[axis] += inputs_dims[i][j];
      } else {
        assert(out_dims[j] == inputs_dims[i][j]);
      }
    }
  }

  if (out_dims[axis] < 0) {
    out_dims[axis] = -1;
  }

  param_.Out()->Resize(out_dims);
}
template class ConcatOp<CPU, float>;

} // namespace operators
} // namespace paddle_mobile