TuneSet.cpp

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//Copyright (c) 2012, University of Cambridge
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#include "TuneSet.h"
#include <boost/iostreams/filter/gzip.hpp>
#include <boost/iostreams/filtering_streambuf.hpp>
#include <boost/iostreams/device/array.hpp>
#include <boost/iostreams/device/file.hpp>
#include <fstream>
#include <iostream>

DEFINE_string (lats, "", "path to vector lattices");
DEFINE_string (idxlimits, "", "sentence index limits 'min:max'");
DEFINE_string (idxscript, "", "script containing a list of sentence ids");

TuneSet::TuneSet() {
}

TuneSet::~TuneSet() {
  for (std::vector<TupleArcFst *>::iterator it = cachedLattices.begin();
       it != cachedLattices.end(); ++it) {
    delete *it;
  }
}

TupleArcFst* TuneSet::LoadLattice (const Sid s) const {
  boost::iostreams::filtering_streambuf<boost::iostreams::input> in;
  in.push (boost::iostreams::gzip_decompressor() );
  in.push (boost::iostreams::file_source (ExpandPath (m_pattern, s) ) );
  std::istream is (&in);
  TupleArcFst32* fst32 = TupleArcFst32::Read (is, fst::FstReadOptions() );
  TopSort (fst32);
  if (!fst32) {
    cerr << "ERROR: unable to load vector lattice: " << ExpandPath (m_pattern,
         s) << '\n';
    exit (1);
  }
  if (fst32->Properties (fst::kNotTopSorted, true) ) {
    cerr << "ERROR: Input lattices are not topologically sorted: " << '\n';
    exit (1);
  }
  TupleArcFst* fst = new TupleArcFst;
  fst::Expand m;
  fst::Map (*fst32, fst, fst::ExpandMapper (m) );
  delete fst32;
  return fst;
}

void TuneSet::Initialize (const bool use_cache) {
  if (FLAGS_lats.empty() ) {
    cerr << "ERROR: mandatory parameter not specified: 'lats'\n";
    exit (1);
  }
  if (!FLAGS_idxlimits.empty() ) {
    InitializeFromLimits (ids, FLAGS_idxlimits.data() );
  }
  if (!FLAGS_idxscript.empty() ) {
    InitializeFromScript (ids, FLAGS_idxscript.data() );
  }
  if (ids.size() == 0) {
    cerr
        << "ERROR: must specify either 'idxlimits' or 'idxscript' parameters"
        << '\n';
    exit (1);
  }
  tracer << "idx min=" << ids.front() << '\n';
  tracer << "idx max=" << ids.back() << '\n';
  m_pattern = FLAGS_lats;
  if (use_cache) {
    cachedLattices.push_back (0);
    for (std::vector<Sid>::const_iterator sit = ids.begin(); sit != ids.end();
         ++sit) {
      cachedLattices.push_back (LoadLattice (*sit) );
    }
    tracer << ids.size() << " vector lattices loaded\n";
  }
}

TupleArcFst* TuneSet::GetVectorLattice (const Sid s,
                                        const bool use_cache) const {
  if (use_cache) {
    return cachedLattices[s];
  }
  return LoadLattice (s);
}