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/******************************************************************************
IrstLM: IRST Language Model Toolkit, compile LM
Copyright (C) 2006 Marcello Federico, ITC-irst Trento, Italy
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
******************************************************************************/
using namespace std;
#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <stdlib.h>
#include "util.h"
#include "math.h"
#include "lmtable.h"
/* GLOBAL OPTIONS ***************/
std::string stxt = "no";
std::string seval = "";
std::string sdebug = "0";
std::string smemmap = "0";
/********************************/
void usage(const char *msg = 0) {
if (msg) { std::cerr << msg << std::endl; }
std::cerr << "Usage: compile-lm [options] input-file.lm [output-file.blm]" << std::endl;
if (!msg) std::cerr << std::endl
<< " compile-lm reads a standard LM file in ARPA format and produces" << std::endl
<< " a compiled representation that the IRST LM toolkit can quickly" << std::endl
<< " read and process. LM file can be compressed with gzip." << std::endl << std::endl;
std::cerr << "Options:\n"
<< "--text=[yes|no] -t=[yes|no] (output is again in text format)\n"
<< "--eval=text-file -e=text-file (computes perplexity of text-file and returns)\n"
<< "--debug=1 -d=1 (verbose output for --eval option)\n"
<< "--memmap=1 --mm=1 (uses memory map to read a binary LM)\n" ;
}
bool starts_with(const std::string &s, const std::string &pre) {
if (pre.size() > s.size()) return false;
if (pre == s) return true;
std::string pre_equals(pre+'=');
if (pre_equals.size() > s.size()) return false;
return (s.substr(0,pre_equals.size()) == pre_equals);
}
std::string get_param(const std::string& opt, int argc, const char **argv, int& argi)
{
std::string::size_type equals = opt.find_first_of('=');
if (equals != std::string::npos && equals < opt.size()-1) {
return opt.substr(equals+1);
}
std::string nexto;
if (argi + 1 < argc) {
nexto = argv[++argi];
} else {
usage((opt + " requires a value!").c_str());
exit(1);
}
return nexto;
}
void handle_option(const std::string& opt, int argc, const char **argv, int& argi)
{
if (opt == "--help" || opt == "-h") { usage(); exit(1); }
if (starts_with(opt, "--text") || starts_with(opt, "-t"))
stxt = get_param(opt, argc, argv, argi);
else
if (starts_with(opt, "--eval") || starts_with(opt, "-e"))
seval = get_param(opt, argc, argv, argi);
else
if (starts_with(opt, "--debug") || starts_with(opt, "-d"))
sdebug = get_param(opt, argc, argv, argi);
else
if (starts_with(opt, "--memmap") || starts_with(opt, "-mm"))
smemmap = get_param(opt, argc, argv, argi);
else {
usage(("Don't understand option " + opt).c_str());
exit(1);
}
}
int main(int argc, const char **argv)
{
if (argc < 2) { usage(); exit(1); }
std::vector<std::string> files;
for (int i=1; i < argc; i++) {
std::string opt = argv[i];
if (opt[0] == '-') { handle_option(opt, argc, argv, i); }
else files.push_back(opt);
}
if (files.size() > 2) { usage("Too many arguments"); exit(1); }
if (files.size() < 1) { usage("Please specify a LM file to read from"); exit(1); }
bool textoutput = (stxt == "yes"? true : false);
int debug = atoi(sdebug.c_str());
int memmap = atoi(smemmap.c_str());
std::string infile = files[0];
std::string outfile="";
if (files.size() == 1) {
outfile=infile;
//remove path information
std::string::size_type p = outfile.rfind('/');
if (p != std::string::npos && ((p+1) < outfile.size()))
outfile.erase(0,p+1);
//eventually strip .gz
if (outfile.compare(outfile.size()-3,3,".gz")==0)
outfile.erase(outfile.size()-3,3);
outfile+=(textoutput?".lm":".blm");
}
else
outfile = files[1];
cerr << "inpfile: " << infile << std::endl;
cerr << "outfile: " << outfile << std::endl;
lmtable lmt;
std::cout << "Reading " << infile << "..." << std::endl;
inputfilestream inp(infile.c_str());
if (!inp.good()) {
std::cerr << "Failed to open " << infile << "!\n";
exit(1);
}
lmt.load(inp,infile.c_str(),memmap);
if (seval != ""){
std::cerr << "Start Eval\n";
std::cerr << "OOV code: " << lmt.dict->oovcode() << "\n";
ngram ng(lmt.dict);
std::cout.setf(ios::fixed);
std::cout.precision(2);
if (debug>1) std::cout.precision(8);
std::fstream inptxt(seval.c_str(),std::ios::in);
int Nbo=0,Nw=0,Noov=0;
double logPr=0,PP=0,PPwp=0,Pr;
int bos=ng.dict->encode(ng.dict->BoS());
#ifdef TRACE_CACHE
lmt.init_probcache();
#endif
while(inptxt >> ng){
if (ng.size>lmt.maxlevel()) ng.size=lmt.maxlevel();
// reset ngram at begin of sentence
if (*ng.wordp(1)==bos) continue;
lmt.bo_state(0);
if (ng.size>=1){
logPr+=(Pr=lmt.clprob(ng));
if (debug>1)
std::cout << ng << "[" << ng.size << "-gram]" << " " << Pr << "\n";
if (*ng.wordp(1) == lmt.dict->oovcode()) Noov++;
Nw++; if (lmt.bo_state()) Nbo++;
}
}
PP=exp((-logPr * log(10.0)) /Nw);
PPwp= PP * exp(Noov * log(10000000.0-lmt.dict->size())/Nw);
std::cout << "%% Nw=" << Nw << " PP=" << PP << " PPwp=" << PPwp
<< " Nbo=" << Nbo << " Noov=" << Noov
<< " OOV=" << (float)Noov/Nw * 100.0 << "%\n";
return 0;
};
std::cout << "Saving to " << outfile << std::endl;
if (textoutput)
lmt.savetxt(outfile.c_str());
else
lmt.savebin(outfile.c_str());
return 0;
}
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