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Copy pathtensor-impl-utils.cc
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52 lines (39 loc) · 1.6 KB
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// tensor/tensor-impl-utils.cc
// Copyright 2019 Johns Hopkins University (author: Daniel Povey)
// See ../../COPYING for clarification regarding multiple authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
// MERCHANTABLITY OR NON-INFRINGEMENT.
// See the Apache 2 License for the specific language governing permissions and
// limitations under the License.
#include "tensor/tensor-impl-utils.h"
namespace kaldi {
namespace tensor {
void Slice(int32 axis, int32 start, int32 end, TensorImpl *t) {
int32 num_axes = t->num_axes;
int32 raxis = (axis >= 0 ? num_axes - 1 - axis : - 1 - axis);
if (static_cast<uint32>(raxis) >= static_cast<uint32>(num_axes)) {
KALDI_ERR << "Axis out of range: " << axis << ", num-axes = "
<< num_axes;
}
int32 dim = t->dims[raxis], stride = t->strides[raxis];
if (end <= start || start < 0 || end > dim) {
KALDI_ERR << "Slice() parameters out of range: start,end = "
<< start << "," << end << ", dim = " << dim;
}
AddToPointer(stride * static_cast<int64>(start), t);
int32 new_dim = end - start;
t->dims[raxis] = new_dim;
if (new_dim == 1)
t->strides[raxis] = 0;
}
} // namespace kaldi
} // namespace tensor