arpa-to-wfsa.cpp

/*
 arpa-to-wfsa.cpp

 Copyright (c) [2012-], Josef Robert Novak
 All rights reserved.

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   modification, are permitted #provided that the following conditions
   are met:

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   notice, this list of conditions and the following disclaimer.
   * Redistributions in binary form must reproduce the above 
   copyright notice, this list of #conditions and the following 
    disclaimer in the documentation and/or other materials provided 
    with the distribution.

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   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
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*
*/
#include "ARPA2WFST.hpp"
using namespace fst;

DEFINE_string( lm,          "",  "Input ARPA format LM." );
DEFINE_string( eps,    "<eps>",  "Epsilon symbols.");
DEFINE_string( sb,       "<s>",  "Sentence begin token.");
DEFINE_string( se,      "</s>",  "Sentence end token.");
DEFINE_string( unk,    "<UNK>",  "Unknown word token.");
DEFINE_bool( use_phi,    true,  "Use phi back-off transitions.");
DEFINE_string( ofile,       "", "Output file for writing. (STDOUT)");

int main( int argc, char* argv[] ){
  string usage = "arpa2wfsa - Transform an ARPA LM into an equivalent WFSA.\n\n Usage: ";
  set_new_handler(FailedNewHandler);
  SetFlags(usage.c_str(), &argc, &argv, false );

  if( FLAGS_lm.compare("")==0 ){
    cout << "You must supply an ARPA format lm to --lm for conversion!" << endl;
    return 0;
  }
    
  cout << "Initializing..." << endl;
  ARPA2WFST* converter = new ARPA2WFST( FLAGS_lm, FLAGS_eps, FLAGS_sb, FLAGS_se, FLAGS_unk );
  cout << "Converting..." << endl;
  converter->arpa_to_wfst( );
  
  if( FLAGS_use_phi == true ){
    cout << "Phi-ifying..." << endl;
    converter->phi_ify( );
  }
  ArcSort(&converter->arpafst, OLabelCompare<StdArc>());
  converter->arpafst.Write(FLAGS_ofile);

  return 1;
}