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Diffstat (limited to 'training/lbl_model.cc')
| -rw-r--r-- | training/lbl_model.cc | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/training/lbl_model.cc b/training/lbl_model.cc new file mode 100644 index 00000000..72d80a56 --- /dev/null +++ b/training/lbl_model.cc @@ -0,0 +1,131 @@ +#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 + |