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nnet3-xvector-get-egs.cc
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nnet3-xvector-get-egs.cc
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// nnet3bin/nnet3-xvector-get-egs.cc
// Copyright 2016-2017 Johns Hopkins University (author: Daniel Povey)
// 2016-2017 Johns Hopkins University (author: Daniel Garcia-Romero)
// 2016-2017 David Snyder
// 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 <sstream>
#include "util/common-utils.h"
#include "nnet3/nnet-example.h"
namespace kaldi {
namespace nnet3 {
// A struct for holding information about the position and
// duration of each chunk.
struct ChunkInfo {
std::string name;
int32 output_archive_id;
int32 start_frame;
int32 num_frames;
int32 label;
};
// Process the range input file and store it as a map from utterance
// name to vector of ChunkInfo structs.
static void ProcessRangeFile(const std::string &range_rxfilename,
unordered_map<std::string, std::vector<ChunkInfo *> > *utt_to_chunks) {
Input range_input(range_rxfilename);
if (!range_rxfilename.empty()) {
std::string line;
while (std::getline(range_input.Stream(), line)) {
ChunkInfo *chunk_info = new ChunkInfo();
std::vector<std::string> fields;
SplitStringToVector(line, " \t\n\r", true, &fields);
if (fields.size() != 6)
KALDI_ERR << "Expected 6 fields in line of range file, got "
<< fields.size() << " instead.";
std::string utt = fields[0],
start_frame_str = fields[3],
num_frames_str = fields[4],
label_str = fields[5];
if (!ConvertStringToInteger(fields[1], &(chunk_info->output_archive_id))
|| !ConvertStringToInteger(start_frame_str, &(chunk_info->start_frame))
|| !ConvertStringToInteger(num_frames_str, &(chunk_info->num_frames))
|| !ConvertStringToInteger(label_str, &(chunk_info->label)))
KALDI_ERR << "Expected integer for output archive in range file.";
chunk_info->name = utt + "-" + start_frame_str + "-" + num_frames_str
+ "-" + label_str;
unordered_map<std::string, std::vector<ChunkInfo*> >::iterator
got = utt_to_chunks->find(utt);
if (got == utt_to_chunks->end()) {
std::vector<ChunkInfo* > chunk_infos;
chunk_infos.push_back(chunk_info);
utt_to_chunks->insert(std::pair<std::string,
std::vector<ChunkInfo* > > (utt, chunk_infos));
} else {
got->second.push_back(chunk_info);
}
}
}
}
static void WriteExamples(const MatrixBase<BaseFloat> &feats,
const std::vector<ChunkInfo *> &chunks, const std::string &utt,
bool compress, int32 num_pdfs, int32 *num_egs_written,
std::vector<NnetExampleWriter *> *example_writers) {
for (std::vector<ChunkInfo *>::const_iterator it = chunks.begin();
it != chunks.end(); ++it) {
ChunkInfo *chunk = *it;
NnetExample eg;
int32 num_rows = feats.NumRows(),
feat_dim = feats.NumCols();
if (num_rows < chunk->num_frames) {
KALDI_WARN << "Unable to create examples for utterance " << utt
<< ". Requested chunk size of "
<< chunk->num_frames
<< " but utterance has only " << num_rows << " frames.";
} else {
// The requested chunk positions are approximate. It's possible
// that they slightly exceed the number of frames in the utterance.
// If that occurs, we can shift the chunks location back slightly.
int32 shift = std::min(0, num_rows - chunk->start_frame
- chunk->num_frames);
SubMatrix<BaseFloat> chunk_mat(feats, chunk->start_frame + shift,
chunk->num_frames, 0, feat_dim);
NnetIo nnet_input = NnetIo("input", 0, chunk_mat);
for (std::vector<Index>::iterator indx_it = nnet_input.indexes.begin();
indx_it != nnet_input.indexes.end(); ++indx_it)
indx_it->n = 0;
Posterior label;
std::vector<std::pair<int32, BaseFloat> > post;
post.push_back(std::pair<int32, BaseFloat>(chunk->label, 1.0));
label.push_back(post);
NnetExample eg;
eg.io.push_back(nnet_input);
eg.io.push_back(NnetIo("output", num_pdfs, 0, label));
if (compress)
eg.Compress();
if (chunk->output_archive_id >= example_writers->size())
KALDI_ERR << "Requested output index exceeds number of specified "
<< "output files.";
(*example_writers)[chunk->output_archive_id]->Write(
chunk->name, eg);
(*num_egs_written) += 1;
}
}
}
} // namespace nnet3
} // namespace kaldi
int main(int argc, char *argv[]) {
try {
using namespace kaldi;
using namespace kaldi::nnet3;
typedef kaldi::int32 int32;
const char *usage =
"Get examples for training an nnet3 neural network for the xvector\n"
"system. Each output example contains a chunk of features from some\n"
"utterance along with a speaker label. The location and length of\n"
"the feature chunks are specified in the 'ranges' file. Each line\n"
"is interpreted as follows:\n"
" <source-utterance> <relative-output-archive-index> "
"<absolute-archive-index> <start-frame-index> <num-frames> "
"<speaker-label>\n"
"where <relative-output-archive-index> is interpreted as a zero-based\n"
"index into the wspecifiers provided on the command line (<egs-0-out>\n"
"and so on), and <absolute-archive-index> is ignored by this program.\n"
"For example:\n"
" utt1 3 13 65 300 3\n"
" utt1 0 10 50 400 3\n"
" utt2 ...\n"
"\n"
"Usage: nnet3-xvector-get-egs [options] <ranges-filename> "
"<features-rspecifier> <egs-0-out> <egs-1-out> ... <egs-N-1-out>\n"
"\n"
"For example:\n"
"nnet3-xvector-get-egs ranges.1 \"$feats\" ark:egs_temp.1.ark"
" ark:egs_temp.2.ark ark:egs_temp.3.ark\n";
bool compress = true;
int32 num_pdfs = -1;
ParseOptions po(usage);
po.Register("compress", &compress, "If true, write egs in "
"compressed format.");
po.Register("num-pdfs", &num_pdfs, "Number of speakers in the training "
"list.");
po.Read(argc, argv);
if (po.NumArgs() < 3) {
po.PrintUsage();
exit(1);
}
std::string range_rspecifier = po.GetArg(1),
feature_rspecifier = po.GetArg(2);
std::vector<NnetExampleWriter *> example_writers;
for (int32 i = 3; i <= po.NumArgs(); i++)
example_writers.push_back(new NnetExampleWriter(po.GetArg(i)));
unordered_map<std::string, std::vector<ChunkInfo *> > utt_to_chunks;
ProcessRangeFile(range_rspecifier, &utt_to_chunks);
SequentialBaseFloatMatrixReader feat_reader(feature_rspecifier);
int32 num_done = 0,
num_err = 0,
num_egs_written = 0;
for (; !feat_reader.Done(); feat_reader.Next()) {
std::string key = feat_reader.Key();
const Matrix<BaseFloat> &feats = feat_reader.Value();
unordered_map<std::string, std::vector<ChunkInfo*> >::iterator
got = utt_to_chunks.find(key);
if (got == utt_to_chunks.end()) {
KALDI_WARN << "Could not create examples from utterance "
<< key << " because it has no entry in the ranges "
<< "input file.";
num_err++;
} else {
std::vector<ChunkInfo *> chunks = got->second;
WriteExamples(feats, chunks, key, compress, num_pdfs,
&num_egs_written, &example_writers);
num_done++;
}
}
// Free memory
for (unordered_map<std::string, std::vector<ChunkInfo*> >::iterator
map_it = utt_to_chunks.begin();
map_it != utt_to_chunks.end(); ++map_it) {
DeletePointers(&map_it->second);
}
DeletePointers(&example_writers);
KALDI_LOG << "Finished generating examples, "
<< "successfully processed " << num_done
<< " feature files, wrote " << num_egs_written << " examples; "
<< num_err << " files had errors.";
return (num_egs_written == 0 || num_err > num_done ? 1 : 0);
} catch(const std::exception &e) {
std::cerr << e.what() << '\n';
return -1;
}
}