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| #ifndef CAFFE2_OPERATORS_ELEMENTWISE_SUB_OP_H_
| #define CAFFE2_OPERATORS_ELEMENTWISE_SUB_OP_H_
|
| #include <algorithm>
| #include <functional>
| #include <vector>
|
| #include "caffe2/operators/elementwise_ops.h"
| #include "caffe2/operators/elementwise_ops_utils.h"
| #include "caffe2/utils/math.h"
|
| namespace caffe2 {
|
| template <class Context>
| struct SubFunctor {
| template <typename TIn, typename TOut>
| bool Forward(
| const std::vector<int>& A_dims,
| const std::vector<int>& B_dims,
| const TIn* A,
| const TIn* B,
| TOut* C,
| Context* context) const {
| math::Sub(
| A_dims.size(),
| A_dims.data(),
| B_dims.size(),
| B_dims.data(),
| A,
| B,
| C,
| context);
| return true;
| }
|
| template <typename TGrad, typename TIn, typename TOut>
| bool Backward(
| const std::vector<int>& A_dims,
| const std::vector<int>& B_dims,
| const TGrad* dC,
| const TIn* /* A */,
| const TIn* /* B */,
| const TOut* /* C */,
| TGrad* dA,
| TGrad* dB,
| Context* context) const {
| const std::vector<int> C_dims =
| elementwise_ops_utils::ComputeBinaryBroadcastForwardDims(
| A_dims, B_dims);
| std::vector<int> A_back_dims;
| std::vector<int> B_back_dims;
| elementwise_ops_utils::ComputeBinaryBroadcastBackwardDims(
| A_dims, B_dims, &A_back_dims, &B_back_dims);
| math::ReduceSum(
| C_dims.size(),
| C_dims.data(),
| A_back_dims.data(),
| TGrad(1),
| dC,
| dA,
| context);
| math::ReduceSum(
| C_dims.size(),
| C_dims.data(),
| B_back_dims.data(),
| TGrad(-1),
| dC,
| dB,
| context);
| return true;
| }
| };
|
| } // namespace caffe2
|
| #endif // CAFFE2_OPERATORS_ELEMENTWISE_SUB_OP_H_
|
|
