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52 lines
2.0 KiB
52 lines
2.0 KiB
8 years ago
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/* 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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#include "paddle/framework/lod_tensor.h"
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#include <glog/logging.h>
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namespace paddle {
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namespace framework {
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LODTensor LODTensor::SliceShared(size_t level_begin, size_t level_end) 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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// slice levels just need to update LOD info, each level will contains the
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// whole tensor_, so no need to modify tensor_.
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return LODTensor(tensor_, new_lod);
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}
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LODTensor LODTensor::SliceShared(size_t level, size_t elem_begin,
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size_t elem_end) 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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true /*tensor_shared*/);
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// slice elements just need to update LOD info, because offsets are not
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// changed, so the original tensor_ can be reused.
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return LODTensor(tensor_, new_lod);
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}
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} // namespace framework
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} // namespace paddle
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