wehub-resource-sync
84 lines
2.7 KiB
C++
84 lines
2.7 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/funcs/for_range.h"
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namespace phi {
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namespace funcs {
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template <typename VecXType, typename T>
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struct StackFunctor {
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HOSTDEVICE StackFunctor(const VecXType &x, T *y, int n, int post)
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: x_(x), y_(y), n_(n), post_(post) {}
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HOSTDEVICE void operator()(int idx) {
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int i = idx / (n_ * post_);
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int which_x = idx / post_ - i * n_;
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int x_index = i * post_ + idx % post_;
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y_[idx] = x_[which_x][x_index];
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}
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private:
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VecXType x_;
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T *y_;
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int n_;
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int post_;
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};
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template <typename VecDxType, typename T>
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struct StackGradFunctor {
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HOSTDEVICE StackGradFunctor(const VecDxType &dx, const T *dy, int n, int post)
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: dx_(dx), dy_(dy), n_(n), post_(post) {}
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HOSTDEVICE void operator()(int idx) {
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int i = idx / (n_ * post_);
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int which_x = idx / post_ - i * n_;
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int x_index = i * post_ + idx % post_;
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if (dx_[which_x] != nullptr) dx_[which_x][x_index] = dy_[idx];
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}
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private:
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VecDxType dx_;
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const T *dy_;
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int n_;
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int post_;
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};
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template <typename DeviceContext, typename VecXType, typename T>
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static inline void StackFunctorForRange(const DeviceContext &dev_ctx,
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const VecXType &x,
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T *y,
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int total_num,
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int n,
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int post) {
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funcs::ForRange<DeviceContext> for_range(dev_ctx, total_num);
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for_range(StackFunctor<VecXType, T>(x, y, n, post));
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}
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template <typename DeviceContext, typename VecDxType, typename T>
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static inline void StackGradFunctorForRange(const DeviceContext &dev_ctx,
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const VecDxType &dx,
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const T *dy,
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int total_num,
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int n,
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int post) {
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funcs::ForRange<DeviceContext> for_range(dev_ctx, total_num);
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for_range(StackGradFunctor<VecDxType, T>(dx, dy, n, post));
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}
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} // namespace funcs
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} // namespace phi
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