shift-feats.cc
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// featbin/shift-feats.cc
// Copyright 2009-2011 Microsoft Corporation
// 2013-2015 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 "base/kaldi-common.h"
#include "util/common-utils.h"
#include "matrix/kaldi-matrix.h"
namespace kaldi {
void ShiftFeatureMatrix(const Matrix<BaseFloat> &src, int32 shift,
Matrix<BaseFloat>* rearranged) {
for (int32 r = 0; r < src.NumRows(); r++) {
int32 src_r = r - shift;
if (src_r < 0) src_r = 0;
if (src_r >= src.NumRows()) src_r = src.NumRows() - 1;
rearranged->Row(r).CopyFromVec(src.Row(src_r));
}
}
}
int main(int argc, char *argv[]) {
try {
using namespace kaldi;
const char *usage =
"Copy features, and possibly shift them while maintaining the "
"num-frames.\n"
"Usage: shift-feats [options] <feature-rspecifier> "
"<feature-wspecifier>\n"
"or: shift-feats [options] <feats-rxfilename> <feats-wxfilename>\n"
"e.g.: shift-feats --shift=-1 foo.scp bar.ark\n"
"or: shift-feats --shift=1 foo.mat bar.mat\n"
"See also: copy-feats, copy-matrix, select-feats, subset-feats,\n"
"subsample-feats, splice-feats, paste-feats, concat-feats, "
"extract-feature-segments\n";
ParseOptions po(usage);
bool binary = true;
int32 shift = 0;
po.Register("shift", &shift, "Number of frames by which to shift the "
"features.");
po.Register("binary", &binary, "Binary-mode output (not relevant if "
"writing to archive)");
po.Read(argc, argv);
if (po.NumArgs() != 2) {
po.PrintUsage();
exit(1);
}
int32 num_done = 0, num_err = 0;
if (ClassifyRspecifier(po.GetArg(1), NULL, NULL) != kNoRspecifier) {
SequentialBaseFloatMatrixReader feat_reader(po.GetArg(1));
BaseFloatMatrixWriter feat_writer(po.GetArg(2));
for (; !feat_reader.Done(); feat_reader.Next()) {
const std::string &key = feat_reader.Key();
const Matrix<BaseFloat> &src = feat_reader.Value();
if (src.NumRows() == 0) {
KALDI_WARN << "Empty matrix for key " << key;
num_err++;
continue;
}
Matrix<BaseFloat> rearranged(src.NumRows(), src.NumCols());
ShiftFeatureMatrix(src, shift, &rearranged);
feat_writer.Write(key, rearranged);
num_done++;
}
KALDI_LOG << "Shifted " << num_done << " features by "
<< shift << " frames; " << num_err << " with errors.";
return (num_done > 0 ? 0 : 1);
} else {
std::string feat_rxfilename = po.GetArg(1),
feat_wxfilename = po.GetArg(2);
Matrix<BaseFloat> src;
ReadKaldiObject(feat_rxfilename, &src);
if (src.NumRows() == 0)
KALDI_ERR << "Empty input matrix";
Matrix<BaseFloat> rearranged(src.NumRows(), src.NumCols());
ShiftFeatureMatrix(src, shift, &rearranged);
WriteKaldiObject(rearranged, feat_wxfilename, binary);
// we do not print any log messages here
}
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}
/*
test:
echo "foo [ 1 1; 2 2; 3 3 ]" | shift-feats --shift=1 ark:- ark,t:-
outputs:
foo [
1 1
1 1
2 2 ]
echo "[ 1 1; 2 2; 3 3 ]" | ./shift-feats --print-args=false --binary=false \
--shift=1 - -
*/