wehub-resource-sync
81 lines
2.3 KiB
C++
81 lines
2.3 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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#include "paddle/phi/kernels/flip_kernel.h"
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#include <bitset>
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#include "paddle/phi/backends/cpu/cpu_context.h"
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#include "paddle/phi/core/kernel_registry.h"
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namespace phi {
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constexpr size_t dim_bitset_size = 64;
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template <typename T, typename Context>
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void FlipKernel(const Context& dev_ctx,
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const DenseTensor& x,
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const std::vector<int>& axis,
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DenseTensor* out) {
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auto x_dims = x.dims();
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const int total_dims = x_dims.size();
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std::bitset<dim_bitset_size> dim_bitset;
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for (auto& item : axis) {
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auto dim = item;
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if (item < 0) {
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dim += total_dims;
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}
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dim_bitset[dim] = true;
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}
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auto x_strides = common::stride(x_dims);
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auto numel = x.numel();
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const T* x_data = x.data<T>();
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T* out_data = dev_ctx.template Alloc<T>(out);
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if (out->numel() == 0) {
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return;
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}
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#ifdef PADDLE_WITH_MKLML
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#pragma omp parallel for
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#endif
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for (int64_t i = 0; i < numel; ++i) {
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int64_t cur_indices = i;
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int64_t rem = 0;
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int64_t dst_offset = 0;
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for (int d = 0; d < total_dims; ++d) {
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int64_t temp = cur_indices;
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cur_indices = cur_indices / x_strides[d];
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rem = temp - cur_indices * x_strides[d];
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dst_offset += dim_bitset[d] ? (x_dims[d] - 1 - cur_indices) * x_strides[d]
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: cur_indices * x_strides[d];
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cur_indices = rem;
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}
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out_data[i] = x_data[dst_offset];
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}
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}
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} // namespace phi
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PD_REGISTER_KERNEL(flip,
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CPU,
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ALL_LAYOUT,
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phi::FlipKernel,
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float,
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double,
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int32_t,
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int64_t,
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bool,
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phi::complex64,
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phi::complex128) {}
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