wehub-resource-sync
82 lines
2.7 KiB
C++
82 lines
2.7 KiB
C++
// Copyright (c) 2023 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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#include "paddle/phi/kernels/funcs/strided_reshape_utils.h"
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#include <array>
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#include "paddle/phi/core/kernel_registry.h"
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#include "paddle/phi/kernels/reshape_kernel.h"
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namespace phi {
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bool ReshapeStride(const DDim& old_dims,
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const DDim& old_stride,
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const DDim& new_dims,
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DDim& new_stride) { // NOLINT
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int64_t numel = product(old_dims);
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if (numel < 0) {
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std::array<int64_t, 2> tmp = {};
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tmp[0] = 1;
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tmp[1] = new_dims.size();
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new_stride = DDim(tmp.data(), 2);
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return true;
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} else if (numel == 0) {
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if (old_dims == new_dims) {
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new_stride = old_stride;
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} else {
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new_stride = new_dims;
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new_stride[new_dims.size() - 1] = 1;
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for (int i = new_dims.size() - 2; i >= 0; i--) {
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new_stride[i] = new_stride[i + 1] *
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std::max(static_cast<int64_t>(1), new_dims[i + 1]);
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}
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}
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return true;
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} else {
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int64_t old_numel = 1;
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int64_t new_numel = 1;
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int64_t old_stride_lastvalue = old_stride[old_stride.size() - 1];
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int new_stride_index = new_dims.size() - 1;
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new_stride = new_dims;
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for (int old_dims_index = old_dims.size() - 1; old_dims_index >= 0;
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old_dims_index--) {
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old_numel *= old_dims[old_dims_index];
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if ((old_dims_index == 0) || (old_dims[old_dims_index - 1] != 1 &&
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old_stride[old_dims_index - 1] !=
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old_numel * old_stride_lastvalue)) {
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while (new_stride_index >= 0 &&
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(new_numel < old_numel || new_dims[new_stride_index] == 1)) {
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new_stride[new_stride_index] = new_numel * old_stride_lastvalue;
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new_numel *= new_dims[new_stride_index];
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new_stride_index--;
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}
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if (new_numel != old_numel) {
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return false;
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}
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if (old_dims_index > 0) {
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old_numel = 1;
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new_numel = 1;
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old_stride_lastvalue = old_stride[old_dims_index - 1];
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}
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}
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}
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if (new_stride_index != -1) {
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return false;
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}
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return true;
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}
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return false;
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}
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} // namespace phi
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