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scfg_make_main.cc
/*************************************************************************/
/* */
/* Centre for Speech Technology Research */
/* University of Edinburgh, UK */
/* Copyright (c) 1996,1997 */
/* All Rights Reserved. */
/* */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* permit persons to whom this work is furnished to do so, subject to */
/* the following conditions: */
/* 1. The code must retain the above copyright notice, this list of */
/* conditions and the following disclaimer. */
/* 2. Any modifications must be clearly marked as such. */
/* 3. Original authors' names are not deleted. */
/* 4. The authors' names are not used to endorse or promote products */
/* derived from this software without specific prior written */
/* permission. */
/* */
/* THE UNIVERSITY OF EDINBURGH AND THE CONTRIBUTORS TO THIS WORK */
/* DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING */
/* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT */
/* SHALL THE UNIVERSITY OF EDINBURGH NOR THE CONTRIBUTORS BE LIABLE */
/* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES */
/* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN */
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/* THIS SOFTWARE. */
/* */
/*************************************************************************/
/* Author : Alan W Black */
/* Date : October 1997 */
/*-----------------------------------------------------------------------*/
/* Build a stochastic context feee grammar with N non-terminals and */
/* M terminals specific as lists or numbers */
/* Probabilities are either even or random on rules and specified as */
/* probs or -log prob */
/* */
/*=======================================================================*/
#include <cstdlib>
#include <cstdio>
#include <iostream>
#include <fstream>
#include <cstring>
#include "EST.h"
#include "EST_SCFG.h"
#include "siod.h"
EST_String outfile = "-";
EST_String domain = "nlogp";
EST_String values = "equal";
static int scfg_make_main(int argc, char **argv);
static void load_symbols(EST_StrList &syms,const EST_String &filename);
static void make_symbols(EST_StrList &syms,int n,const EST_String &prefix);
static LISP assign_probs(LISP rules, const EST_String &domain,
const EST_String &values);
static LISP make_all_rules(const EST_StrList &NonTerminals,
const EST_StrList &Terminals);
static void generate_probs(double *probs,int num);
/** @name <command>scfg_make</command> <emphasis>Make the rules for a stochastic context free grammar</emphasis>
@id scfg-make-manual
* @toc
*/
//@{
/**@name Synopsis
*/
//@{
//@synopsis
/**
Builds a stochastic context free grammar from a vocabulary of non-terminal
and terminal symbols. An exhaustive set of all possible binary rules
are generated with random (or equal) probabilities (or negative log
probabilities). This program is designed for making grammars that
can be trained using scfg_train.
*/
//@}
/**@name OPTIONS
*/
//@{
//@options
//@}
int main(int argc, char **argv)
{
scfg_make_main(argc,argv);
exit(0);
return 0;
}
static int scfg_make_main(int argc, char **argv)
{
// Top level function generates a probabilistic grammar
EST_Option al;
EST_StrList files;
EST_StrList NonTerminals, Terminals;
LISP rules,r;
FILE *fd;
parse_command_line
(argc, argv,
EST_String("[options]\n")+
"Summary: Build a stochastic context free grammar\n"+
"-nonterms <string> Number of nonterminals or file containing them\n"+
"-terms <string> Number of terminals or file containing them\n"+
"-domain <string> {nlogp}\n"+
" Values to be nlogp (negative log probabilities)\n"+
" or prob (probabilities)\n"+
"-values <string> {equal}\n"+
" General initial scores on rules as equal or\n"
" random\n"+
"-heap <int> {500000}\n"+
" Set size of Lisp heap, only needed for large grammars\n"+
"-o <ofile> File to save grammar (default stdout)\n",
files, al);
if (al.present("-o"))
outfile = al.val("-o");
else
outfile = "-";
if (al.present("-domain"))
{
if (al.val("-domain") == "nlogp")
domain = "nlogp";
else if (al.val("-domain") == "prob")
domain = "prob";
else
{
cerr << "scfg_make: domain must be nlogp or prob" << endl;
exit(1);
}
}
if (al.present("-values"))
{
if (al.val("-values") == "equal")
values = "equal";
else if (al.val("-values") == "random")
values = "random";
else
{
cerr << "scfg_make: values must be equal or random" << endl;
exit(1);
}
}
if (al.present("-nonterms"))
{
if (al.val("-nonterms").matches(RXint))
make_symbols(NonTerminals,al.ival("-nonterms"),"NT");
else
load_symbols(NonTerminals,al.val("-nonterms"));
}
else
{
cerr << "scfg_make: no nonterminals specified" << endl;
exit(1);
}
if (al.present("-terms"))
{
if (al.val("-terms").matches(RXint))
make_symbols(Terminals,al.ival("-terms"),"T");
else
load_symbols(Terminals,al.val("-terms"));
}
else
{
cerr << "scfg_make: no terminals specified" << endl;
exit(1);
}
siod_init(al.ival("-heap"));
rules = make_all_rules(NonTerminals,Terminals);
rules = assign_probs(rules,domain,values);
if (outfile == "-")
fd = stdout;
else
{
if ((fd=fopen(outfile,"w")) == NULL)
{
cerr << "scfg_make: failed to open file \"" << outfile <<
"\" for writing" << endl;
exit(1);
}
}
for (r=rules; r != NIL; r=cdr(r))
pprint_to_fd(fd,car(r));
if (fd != stdout)
fclose(fd);
return 0;
}
static LISP make_all_rules(const EST_StrList &NonTerminals,
const EST_StrList &Terminals)
{
// Build all possibly rules (CNF)
// NT -> NT NT and NT -> T
EST_Litem *p,*q,*r;
LISP rules = NIL;
for (p=NonTerminals.head(); p != 0; p=p->next())
{
int num_rules_nt = (NonTerminals.length()*NonTerminals.length())+
Terminals.length();
double *probs = new double[num_rules_nt];
generate_probs(probs,num_rules_nt);
int i=0;
for (q=NonTerminals.head(); q != 0; q=q->next())
for (r=NonTerminals.head(); r != 0; r=r->next(),i++)
rules = cons(cons(flocons(probs[i]),
cons(rintern(NonTerminals(p)),
cons(rintern(NonTerminals(q)),
cons(rintern(NonTerminals(r)),NIL)))),
rules);
for (q=Terminals.head(); q != 0; q=q->next(),i++)
rules = cons(cons(flocons(probs[i]),
cons(rintern(NonTerminals(p)),
cons(rintern(Terminals(q)),NIL))),
rules);
delete [] probs;
}
return reverse(rules);
}
static void generate_probs(double *probs,int num)
{
// Generate probabilities
int i;
if (values == "equal")
{
double defp = 1.0/(float)num;
for (i=0; i < num; i++)
probs[i] = defp;
}
else if (values == "random")
{
// This isn't random but is somewhat arbitrary
double sum = 0;
for (i=0; i < num; i++)
{
probs[i] = (double)abs(rand())/(double)0x7fff;
sum += probs[i];
}
for (i=0; i < num; i++)
{
probs[i] /= sum;
}
}
else
{
cerr << "scfg_make: unknown value for probability distribution"
<< endl;
exit(1);
}
}
static LISP assign_probs(LISP rules, const EST_String &domain,
const EST_String &values)
{
// Modify probs (don't know how to do random probs yet)
LISP r;
(void)values;
if (domain == "nlogp")
for (r=rules; r != NIL; r = cdr(r))
{
if (get_c_float(car(car(r))) == 0)
CAR(car(r)) = flocons(40);
else
CAR(car(r)) = flocons(-log(get_c_float(car(car(r)))));
}
return rules;
}
static void make_symbols(EST_StrList &syms,int n,const EST_String &prefix)
{
// Generate n symbols with given prefix
int i;
int magnitude,t;
for (magnitude=0,t=n; t > 0; t=t/10)
magnitude++;
char *name = walloc(char,prefix.length()+magnitude+1);
char *skel = walloc(char,prefix.length()+5);
sprintf(skel,"%s%%%02dd",(const char *)prefix,magnitude);
for (i=0; i < n; i++)
{
sprintf(name,skel,i);
syms.append(name);
}
wfree(name);
wfree(skel);
}
static void load_symbols(EST_StrList &syms,const EST_String &filename)
{
// Load symbol list for file
load_StrList(filename,syms);
}
EST_Option
Definition EST_Option.h:50
EST_Option::ival
int ival(const EST_String &rkey, int m=1) const
Definition EST_Option.cc:76
EST_String
Definition EST_String.h:70
EST_String::length
int length(void) const
Length of string ({not} length of underlying chunk).
Definition EST_String.h:241
EST_String::matches
int matches(const char *e, int pos=0) const
Exactly match this string?
Definition EST_String.cc:652
EST_TKVL::val
const V & val(const K &rkey, bool m=0) const
return value according to key (const)
Definition EST_TKVL.cc:145
EST_TKVL::present
const int present(const K &rkey) const
Returns true if key is present.
Definition EST_TKVL.cc:222
EST_TList::append
void append(const T &item)
add item onto end of list
Definition EST_TList.h:191