wehub-resource-sync
107 lines
3.1 KiB
C++
107 lines
3.1 KiB
C++
// Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include "paddle/phi/kernels/bmm_grad_kernel.h"
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#include "paddle/phi/kernels/funcs/blas/blas.h"
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#include "paddle/phi/kernels/impl/matmul_grad_kernel_impl.h"
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namespace phi {
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template <typename T, typename Context>
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void MatMul(const Context& dev_ctx,
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const DenseTensor& a,
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bool trans_a,
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const DenseTensor& b,
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bool trans_b,
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DenseTensor* out) {
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dev_ctx.template Alloc<T>(out);
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auto blas = funcs::GetBlas<Context, T>(dev_ctx);
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auto mat_dim_a = funcs::CreateMatrixDescriptor(a.dims(), 0, trans_a);
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auto mat_dim_b = funcs::CreateMatrixDescriptor(b.dims(), 0, trans_b);
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blas.MatMul(a, mat_dim_a, b, mat_dim_b, T(1), out, T(0));
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}
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template <typename T, typename Context>
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void CalcInputGrad(const Context& dev_ctx,
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const DenseTensor& a,
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bool trans_a,
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const DenseTensor& b,
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bool trans_b,
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DenseTensor* out) {
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if (out == nullptr) return;
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MatMul<T, Context>(dev_ctx, a, trans_a, b, trans_b, out);
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}
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template <typename T, typename Context>
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void BmmGradKernel(const Context& dev_ctx,
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const DenseTensor& x,
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const DenseTensor& y,
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const DenseTensor& out_grad,
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DenseTensor* x_grad,
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DenseTensor* y_grad) {
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if (x_grad && x_grad->numel() == 0) {
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dev_ctx.template Alloc<T>(x_grad);
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Full<T, Context>(dev_ctx, y.dims(), 0, y_grad);
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return;
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}
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if (y_grad && y_grad->numel() == 0) {
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dev_ctx.template Alloc<T>(y_grad);
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Full<T, Context>(dev_ctx, x.dims(), 0, x_grad);
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return;
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}
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DenseTensor x_help = x;
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DenseTensor y_help = y;
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DenseTensor out_grad_help = out_grad;
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ReshapeXYOutIntoMatrixSequence(
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&x_help, &y_help, &out_grad_help, false, false);
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DDim dx_dims;
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if (x_grad) {
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dx_dims = x_grad->dims();
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if (dx_dims != x_help.dims()) {
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x_grad->Resize(x_help.dims());
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}
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}
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DDim dy_dims;
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if (y_grad) {
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dy_dims = y_grad->dims();
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if (dy_dims != y_help.dims()) {
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y_grad->Resize(y_help.dims());
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}
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}
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CalcInputGrad<T, Context>(
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dev_ctx, out_grad_help, false, y_help, true, x_grad);
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CalcInputGrad<T, Context>(
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dev_ctx, x_help, true, out_grad_help, false, y_grad);
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if (x_grad) {
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if (dx_dims != x_help.dims()) {
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x_grad->Resize(dx_dims);
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}
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}
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if (y_grad) {
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if (dy_dims != y_help.dims()) {
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y_grad->Resize(dy_dims);
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}
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}
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}
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} // namespace phi
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