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#include <iostream>
#include "config.h"
#ifndef HAVE_EIGEN
int main() { std::cerr << "Please rebuild with --with-eigen PATH\n"; return 1; }
#else
#include <cmath>
#include <boost/program_options.hpp>
#include <boost/program_options/variables_map.hpp>
#include <Eigen/Dense>
#include "m.h"
#include "lattice.h"
#include "stringlib.h"
#include "filelib.h"
#include "tdict.h"
namespace po = boost::program_options;
using namespace std;
bool InitCommandLine(int argc, char** argv, po::variables_map* conf) {
po::options_description opts("Configuration options");
opts.add_options()
("iterations,i",po::value<unsigned>()->default_value(5),"Number of iterations of training")
("diagonal_tension,T", po::value<double>()->default_value(4.0), "How sharp or flat around the diagonal is the alignment distribution (0 = uniform, >0 sharpens)")
("testset,x", po::value<string>(), "After training completes, compute the log likelihood of this set of sentence pairs under the learned model");
po::options_description clo("Command line options");
clo.add_options()
("config", po::value<string>(), "Configuration file")
("help,h", "Print this help message and exit");
po::options_description dconfig_options, dcmdline_options;
dconfig_options.add(opts);
dcmdline_options.add(opts).add(clo);
po::store(parse_command_line(argc, argv, dcmdline_options), *conf);
if (conf->count("config")) {
ifstream config((*conf)["config"].as<string>().c_str());
po::store(po::parse_config_file(config, dconfig_options), *conf);
}
po::notify(*conf);
if (argc < 2 || conf->count("help")) {
cerr << "Usage " << argv[0] << " [OPTIONS] corpus.fr-en\n";
cerr << dcmdline_options << endl;
return false;
}
return true;
}
int main(int argc, char** argv) {
po::variables_map conf;
if (!InitCommandLine(argc, argv, &conf)) return 1;
const string fname = argv[argc - 1];
const int ITERATIONS = conf["iterations"].as<unsigned>();
const double diagonal_tension = conf["diagonal_tension"].as<double>();
string testset;
if (conf.count("testset")) testset = conf["testset"].as<string>();
double tot_len_ratio = 0;
double mean_srclen_multiplier = 0;
vector<double> unnormed_a_i;
for (int iter = 0; iter < ITERATIONS; ++iter) {
cerr << "ITERATION " << (iter + 1) << endl;
ReadFile rf(fname);
istream& in = *rf.stream();
double likelihood = 0;
double denom = 0.0;
int lc = 0;
bool flag = false;
string line;
string ssrc, strg;
while(true) {
getline(in, line);
if (!in) break;
++lc;
if (lc % 1000 == 0) { cerr << '.'; flag = true; }
if (lc %50000 == 0) { cerr << " [" << lc << "]\n" << flush; flag = false; }
ParseTranslatorInput(line, &ssrc, &strg);
Lattice src, trg;
LatticeTools::ConvertTextToLattice(ssrc, &src);
LatticeTools::ConvertTextToLattice(strg, &trg);
if (src.size() == 0 || trg.size() == 0) {
cerr << "Error: " << lc << "\n" << line << endl;
assert(src.size() > 0);
assert(trg.size() > 0);
}
if (src.size() > unnormed_a_i.size())
unnormed_a_i.resize(src.size());
if (iter == 0)
tot_len_ratio += static_cast<double>(trg.size()) / static_cast<double>(src.size());
denom += trg.size();
vector<double> probs(src.size() + 1);
bool first_al = true; // used for write_alignments
for (int j = 0; j < trg.size(); ++j) {
const WordID& f_j = trg[j][0].label;
double sum = 0;
const double j_over_ts = double(j) / trg.size();
double prob_a_i = 1.0 / src.size();
double az = 0;
for (int ta = 0; ta < src.size(); ++ta) {
unnormed_a_i[ta] = exp(-fabs(double(ta) / src.size() - j_over_ts) * diagonal_tension);
az += unnormed_a_i[ta];
}
for (int i = 1; i <= src.size(); ++i) {
prob_a_i = unnormed_a_i[i-1] / az;
probs[i] = 1; // tt.prob(src[i-1][0].label, f_j) * prob_a_i;
sum += probs[i];
}
}
}
// log(e) = 1.0
double base2_likelihood = likelihood / log(2);
if (flag) { cerr << endl; }
if (iter == 0) {
mean_srclen_multiplier = tot_len_ratio / lc;
cerr << "expected target length = source length * " << mean_srclen_multiplier << endl;
}
cerr << " log_e likelihood: " << likelihood << endl;
cerr << " log_2 likelihood: " << base2_likelihood << endl;
cerr << " cross entropy: " << (-base2_likelihood / denom) << endl;
cerr << " perplexity: " << pow(2.0, -base2_likelihood / denom) << endl;
}
return 0;
}
#endif
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