lattice-scale.cc File Reference

#include "base/kaldi-common.h"
#include "util/common-utils.h"
#include "fstext/fstext-lib.h"
#include "lat/kaldi-lattice.h"

Include dependency graph for lattice-scale.cc:

Go to the source code of this file.

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

Function Documentation

main()

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

Definition at line 27 of file lattice-scale.cc.

References SequentialTableReader< Holder >::Done(), ParseOptions::GetArg(), KALDI_ASSERT, KALDI_LOG, SequentialTableReader< Holder >::Key(), SequentialTableReader< Holder >::Next(), ParseOptions::NumArgs(), ParseOptions::PrintUsage(), ParseOptions::Read(), ParseOptions::Register(), fst::ScaleLattice(), SequentialTableReader< Holder >::Value(), and TableWriter< Holder >::Write().

                                 {
  try {
    using namespace kaldi;
    typedef kaldi::int32 int32;
    typedef kaldi::int64 int64;
    using fst::SymbolTable;
    using fst::VectorFst;
    using fst::StdArc;

    const char *usage =
        "Apply scaling to lattice weights\n"
        "Usage: lattice-scale [options] lattice-rspecifier lattice-wspecifier\n"
        " e.g.: lattice-scale --lm-scale=0.0 ark:1.lats ark:scaled.lats\n";

    ParseOptions po(usage);
    bool write_compact = true;
    BaseFloat acoustic_scale = 1.0;
    BaseFloat inv_acoustic_scale = 1.0;
    BaseFloat lm_scale = 1.0;
    BaseFloat acoustic2lm_scale = 0.0;
    BaseFloat lm2acoustic_scale = 0.0;

    po.Register("write-compact", &write_compact, "If true, write in normal (compact) form.");
    po.Register("acoustic-scale", &acoustic_scale, "Scaling factor for acoustic likelihoods");
    po.Register("inv-acoustic-scale", &inv_acoustic_scale, "An alternative way "
                "of setting the acoustic scale: you can set its inverse.");
    po.Register("lm-scale", &lm_scale, "Scaling factor for graph/lm costs");
    po.Register("acoustic2lm-scale", &acoustic2lm_scale, "Add this times original acoustic costs to LM costs");
    po.Register("lm2acoustic-scale", &lm2acoustic_scale, "Add this times original LM costs to acoustic costs");

    po.Read(argc, argv);

    if (po.NumArgs() != 2) {
      po.PrintUsage();
      exit(1);
    }

    std::string lats_rspecifier = po.GetArg(1),
        lats_wspecifier = po.GetArg(2);

    int32 n_done = 0;

    KALDI_ASSERT(acoustic_scale == 1.0 || inv_acoustic_scale == 1.0);
    if (inv_acoustic_scale != 1.0)
      acoustic_scale = 1.0 / inv_acoustic_scale;

    std::vector<std::vector<double> > scale(2);
    scale[0].resize(2);
    scale[1].resize(2);
    scale[0][0] = lm_scale;
    scale[0][1] = acoustic2lm_scale;
    scale[1][0] = lm2acoustic_scale;
    scale[1][1] = acoustic_scale;

    if (write_compact) {
      SequentialCompactLatticeReader compact_lattice_reader(lats_rspecifier);

      // Write as compact lattice.
      CompactLatticeWriter compact_lattice_writer(lats_wspecifier);

      for (; !compact_lattice_reader.Done(); compact_lattice_reader.Next()) {
        CompactLattice lat = compact_lattice_reader.Value();
        ScaleLattice(scale, &lat);
        compact_lattice_writer.Write(compact_lattice_reader.Key(), lat);
        n_done++;
      }
    } else {
      SequentialLatticeReader lattice_reader(lats_rspecifier);

      // Write as regular lattice.
      LatticeWriter lattice_writer(lats_wspecifier);

      for (; !lattice_reader.Done(); lattice_reader.Next()) {
        Lattice lat = lattice_reader.Value();
        ScaleLattice(scale, &lat);
        lattice_writer.Write(lattice_reader.Key(), lat);
        n_done++;
      }
    }

    KALDI_LOG << "Done " << n_done << " lattices.";
    return (n_done != 0 ? 0 : 1);
  } catch(const std::exception &e) {
    std::cerr << e.what();
    return -1;
  }
}