nnet-get-egs.cc File Reference

#include <sstream>
#include "base/kaldi-common.h"
#include "util/common-utils.h"
#include "hmm/transition-model.h"
#include "nnet2/nnet-example-functions.h"

Include dependency graph for nnet-get-egs.cc:

Go to the source code of this file.

Namespaces
	kaldi
	This code computes Goodness of Pronunciation (GOP) and extracts phone-level pronunciation feature for mispronunciations detection tasks, the reference:
	kaldi::nnet2

Functions
static void	ProcessFile (const MatrixBase< BaseFloat > &feats, const Posterior &pdf_post, const std::string &utt_id, int32 left_context, int32 right_context, int32 num_frames, int32 const_feat_dim, int64 *num_frames_written, int64 *num_egs_written, NnetExampleWriter *example_writer)
int	main (int argc, char *argv[])

Function Documentation

main()

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 94 of file nnet-get-egs.cc.

References SequentialTableReader< Holder >::Done(), ParseOptions::GetArg(), RandomAccessTableReader< Holder >::HasKey(), KALDI_LOG, KALDI_WARN, SequentialTableReader< Holder >::Key(), SequentialTableReader< Holder >::Next(), ParseOptions::NumArgs(), MatrixBase< Real >::NumRows(), ParseOptions::PrintUsage(), kaldi::nnet2::ProcessFile(), ParseOptions::Read(), ParseOptions::Register(), RandomAccessTableReader< Holder >::Value(), and SequentialTableReader< Holder >::Value().

                                 {
  try {
    using namespace kaldi;
    using namespace kaldi::nnet2;
    typedef kaldi::int32 int32;
    typedef kaldi::int64 int64;

    const char *usage =
        "Get frame-by-frame examples of data for neural network training.\n"
        "Essentially this is a format change from features and posteriors\n"
        "into a special frame-by-frame format.  To split randomly into\n"
        "different subsets, do nnet-copy-egs with --random=true, but\n"
        "note that this does not randomize the order of frames.\n"
        "\n"
        "Usage:  nnet-get-egs [options] <features-rspecifier> "
        "<pdf-post-rspecifier> <training-examples-out>\n"
        "\n"
        "An example [where $feats expands to the actual features]:\n"
        "nnet-get-egs --left-context=8 --right-context=8 \"$feats\" \\\n"
        "  \"ark:gunzip -c exp/nnet/ali.1.gz | ali-to-pdf exp/nnet/1.nnet ark:- ark:- | ali-to-post ark:- ark:- |\" \\\n"
        "   ark:- \n"
        "Note: the --left-context and --right-context would be derived from\n"
        "the output of nnet-info.";
        
    
    int32 left_context = 0, right_context = 0,
        num_frames = 1, const_feat_dim = 0;
    
    ParseOptions po(usage);
    po.Register("left-context", &left_context, "Number of frames of left "
                "context the neural net requires.");
    po.Register("right-context", &right_context, "Number of frames of right "
                "context the neural net requires.");
    po.Register("num-frames", &num_frames, "Number of frames with labels "
                "that each example contains.");
    po.Register("const-feat-dim", &const_feat_dim, "If specified, the last "
                "const-feat-dim dimensions of the feature input are treated as "
                "constant over the context window (so are not spliced)");
    
    po.Read(argc, argv);

    if (po.NumArgs() != 3) {
      po.PrintUsage();
      exit(1);
    }

    std::string feature_rspecifier = po.GetArg(1),
        pdf_post_rspecifier = po.GetArg(2),
        examples_wspecifier = po.GetArg(3);

    // Read in all the training files.
    SequentialBaseFloatMatrixReader feat_reader(feature_rspecifier);
    RandomAccessPosteriorReader pdf_post_reader(pdf_post_rspecifier);
    NnetExampleWriter example_writer(examples_wspecifier);
    
    int32 num_done = 0, num_err = 0;
    int64 num_frames_written = 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();
      if (!pdf_post_reader.HasKey(key)) {
        KALDI_WARN << "No pdf-level posterior for key " << key;
        num_err++;
      } else {
        const Posterior &pdf_post = pdf_post_reader.Value(key);
        if (pdf_post.size() != feats.NumRows()) {
          KALDI_WARN << "Posterior has wrong size " << pdf_post.size()
                     << " versus " << feats.NumRows();
          num_err++;
          continue;
        }
        ProcessFile(feats, pdf_post, key,
                    left_context, right_context, num_frames,
                    const_feat_dim, &num_frames_written, &num_egs_written,
                    &example_writer);
        num_done++;
      }
    }

    KALDI_LOG << "Finished generating examples, "
              << "successfully processed " << num_done
              << " feature files, wrote " << num_egs_written << " examples, "
              << " with " << num_frames_written << " egs in total; "
              << 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;
  }
}