fst-train.C
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/*******************************************************************/
/* */
/* File: fst-train.C */
/* Author: Helmut Schmid */
/* Purpose: EM training of a transducer */
/* Created: Mon Aug 8 15:11:36 2005 */
/* Modified: Thu Nov 27 17:20:49 2008 (schmid) */
/* */
/*******************************************************************/
#include <math.h>
#include "compact.h"
using std::cerr;
using std::vector;
const int BUFFER_SIZE=1000;
bool Verbose=true;
bool BothLayers=false;
bool Disambiguate=false;
vector<char*> Filenames;
/*******************************************************************/
/* */
/* print_parameters */
/* */
/*******************************************************************/
void print_parameters( vector<double> &arcfreq, vector<double> &finalfreq,
FILE *file )
{
size_t n = finalfreq.size();
fwrite(&n, sizeof(n), 1, file);
n = arcfreq.size();
fwrite(&n, sizeof(n), 1, file);
for( size_t n=0; n<finalfreq.size(); n++ ) {
float f = (float)log(finalfreq[n]);
fwrite(&f, sizeof(f), 1, file);
}
for( size_t a=0; a<arcfreq.size(); a++ ) {
float f = (float)log(arcfreq[a]);
fwrite(&f, sizeof(f), 1, file);
}
}
/*******************************************************************/
/* */
/* usage */
/* */
/*******************************************************************/
void usage()
{
cerr << "\nUsage: fst-train [options] file [file]\n\n";
cerr << "Options:\n";
cerr << "-t tfile: alternative transducer\n";
cerr << "-b: input with surface and analysis characters\n";
cerr << "-d: disambiguate symbolically (use only the simplest analyses)\n";
cerr << "-q: suppress status messages\n";
cerr << "-h: print this message\n";
exit(1);
}
/*******************************************************************/
/* */
/* get_flags */
/* */
/*******************************************************************/
void get_flags( int *argc, char **argv )
{
for( int i=1; i<*argc; i++ ) {
if (strcmp(argv[i],"-q") == 0) {
Verbose = false;
argv[i] = NULL;
}
else if (strcmp(argv[i],"-d") == 0) {
Disambiguate = true;
argv[i] = NULL;
}
else if (strcmp(argv[i],"-b") == 0) {
BothLayers = true;
argv[i] = NULL;
}
else if (strcmp(argv[i],"-h") == 0) {
usage();
argv[i] = NULL;
}
else if (i < *argc-1) {
if (strcmp(argv[i],"-t") == 0) {
Filenames.push_back(argv[i+1]);
argv[i] = NULL;
argv[++i] = NULL;
}
}
}
// remove flags from the argument list
int k;
for( int i=k=1; i<*argc; i++)
if (argv[i] != NULL)
argv[k++] = argv[i];
*argc = k;
}
/*******************************************************************/
/* */
/* main */
/* */
/*******************************************************************/
int main( int argc, char **argv )
{
FILE *file;
vector<CompactTransducer*> transducer;
get_flags(&argc, argv);
if (argc < 2)
usage();
Filenames.push_back(argv[1]);
try {
for( size_t i=0; i<Filenames.size(); i++ ) {
if ((file = fopen(Filenames[i],"rb")) == NULL) {
fprintf(stderr, "\nError: Cannot open transducer file %s\n\n",
Filenames[i]);
exit(1);
}
if (Verbose)
cerr << "reading transducer from file \"" << Filenames[i] <<"\"...\n";
transducer.push_back(new CompactTransducer(file));
fclose(file);
transducer[i]->simplest_only = Disambiguate;
if (Verbose)
cerr << "finished.\n";
}
if (argc <= 2)
file = stdin;
else {
if ((file = fopen(argv[2],"rt")) == NULL) {
fprintf(stderr,"\nError: Cannot open input file %s\n\n",argv[2]);
exit(1);
}
}
vector<vector<double> > arcfreq, finalfreq;
finalfreq.resize(transducer.size());
arcfreq.resize(transducer.size());
for( size_t i=0; i<transducer.size(); i++ ) {
finalfreq[i].resize(transducer[i]->node_count(), 0.0);
arcfreq[i].resize(transducer[i]->arc_count(), 0.0);
}
char buffer[BUFFER_SIZE];
int N=0;
while (fgets(buffer, BUFFER_SIZE, file)) {
if (Verbose && ++N % 100 == 0)
fprintf(stderr,"\r%d", N);
int l=(int)strlen(buffer)-1;
if (buffer[l] == '\n')
buffer[l] = '\0';
for( size_t i=0; i<transducer.size(); i++ ) {
if (BothLayers) {
if (transducer[i]->train2(buffer, arcfreq[i], finalfreq[i] ))
break;
}
else {
if (transducer[i]->train(buffer, arcfreq[i], finalfreq[i] ))
break;
}
}
}
if (Verbose)
fputc('\n', stderr);
for( size_t i=0; i<transducer.size(); i++ ) {
char buffer[1000];
FILE *outfile;
sprintf(buffer, "%s.prob", Filenames[i]);
if ((outfile = fopen(buffer,"wb")) == NULL) {
fprintf(stderr, "\nError: Cannot open probability file %s.prob\n\n",
Filenames[i]);
exit(1);
}
transducer[i]->estimate_probs( arcfreq[i], finalfreq[i] );
print_parameters( arcfreq[i], finalfreq[i], outfile );
}
}
catch (const char *p) {
cerr << p << "\n";
return 1;
}
return 0;
}