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61 lines
2.3 KiB
61 lines
2.3 KiB
/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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/framework/details/lod_tensor.h"
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namespace paddle {
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namespace framework {
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template <typename T>
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LODTensor LODTensor::SliceCopied(size_t level_begin, size_t level_end,
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const platform::Place &dst_place) const {
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PADDLE_ENFORCE(HasLOD(), "has no LOD info, can't be sliced.");
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auto new_lod = details::SliceLOD(*lod_start_pos_, level_begin, level_end);
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auto new_tensor = std::make_shared<Tensor>();
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new_tensor->CopyFrom<T>(*tensor_, dst_place);
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return LODTensor(new_tensor, new_lod);
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}
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template <typename T>
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LODTensor LODTensor::SliceCopied(size_t level, size_t elem_begin,
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size_t elem_end,
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const platform::Place &dst_place) const {
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PADDLE_ENFORCE(HasLOD(), "has no LOD info, can't be sliced.");
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PADDLE_ENFORCE(level < NumLevels(), "level [%d] out of range [%d]", level,
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NumLevels());
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PADDLE_ENFORCE(elem_begin < NumElements(level),
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"element begin [%d] out of range [%d]", elem_begin,
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NumElements(level));
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PADDLE_ENFORCE(elem_end < NumElements(level) + 1,
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"element end [%d] out of range [%d]", elem_end,
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NumElements(level));
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auto new_lod = details::SliceLOD(*lod_start_pos_, level, elem_begin, elem_end,
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false /*tensor_shared*/);
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auto start_idx = new_lod->front().front();
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auto end_idx = new_lod->front().back() - 1 /*the next element's start*/;
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auto sliced_tensor = tensor_->Slice<T>(start_idx, end_idx);
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auto new_tensor = std::make_shared<Tensor>();
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new_tensor->CopyFrom<T>(sliced_tensor, dst_place);
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return LODTensor(new_tensor, new_lod);
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}
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} // namespace framework
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} // namespace paddle
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