diff options
Diffstat (limited to 'pro-train/mr_pro_reduce.cc')
| -rw-r--r-- | pro-train/mr_pro_reduce.cc | 140 |
1 files changed, 89 insertions, 51 deletions
diff --git a/pro-train/mr_pro_reduce.cc b/pro-train/mr_pro_reduce.cc index 5382e1a5..491ceb3a 100644 --- a/pro-train/mr_pro_reduce.cc +++ b/pro-train/mr_pro_reduce.cc @@ -7,6 +7,7 @@ #include <boost/program_options.hpp> #include <boost/program_options/variables_map.hpp> +#include "filelib.h" #include "weights.h" #include "sparse_vector.h" #include "optimize.h" @@ -25,6 +26,7 @@ void InitCommandLine(int argc, char** argv, po::variables_map* conf) { ("interpolation,p",po::value<double>()->default_value(0.9), "Output weights are p*w + (1-p)*w_prev") ("memory_buffers,m",po::value<unsigned>()->default_value(200), "Number of memory buffers (LBFGS)") ("sigma_squared,s",po::value<double>()->default_value(1.0), "Sigma squared for Gaussian prior") + ("testset,t",po::value<string>(), "Optional held-out test set to tune regularizer") ("help,h", "Help"); po::options_description dcmdline_options; dcmdline_options.add(opts); @@ -60,13 +62,79 @@ void ParseSparseVector(string& line, size_t cur, SparseVector<double>* out) { } } +void ReadCorpus(istream* pin, vector<pair<bool, SparseVector<double> > >* corpus) { + istream& in = *pin; + corpus->clear(); + bool flag = false; + int lc = 0; + string line; + SparseVector<double> x; + while(getline(in, line)) { + ++lc; + if (lc % 1000 == 0) { cerr << '.'; flag = true; } + if (lc % 40000 == 0) { cerr << " [" << lc << "]\n"; flag = false; } + if (line.empty()) continue; + const size_t ks = line.find("\t"); + assert(string::npos != ks); + assert(ks == 1); + const bool y = line[0] == '1'; + x.clear(); + ParseSparseVector(line, ks + 1, &x); + corpus->push_back(make_pair(y, x)); + } + if (flag) cerr << endl; +} + +void GradAdd(const SparseVector<double>& v, const double scale, vector<double>* acc) { + for (SparseVector<double>::const_iterator it = v.begin(); + it != v.end(); ++it) { + (*acc)[it->first] += it->second * scale; + } +} + +double TrainingInference(const vector<double>& x, + const vector<pair<bool, SparseVector<double> > >& corpus, + vector<double>* g = NULL) { + if (g) fill(g->begin(), g->end(), 0.0); + + double cll = 0; + for (int i = 0; i < corpus.size(); ++i) { + const double dotprod = corpus[i].second.dot(x) + x[0]; // x[0] is bias + double lp_false = dotprod; + double lp_true = -dotprod; + if (0 < lp_true) { + lp_true += log1p(exp(-lp_true)); + lp_false = log1p(exp(lp_false)); + } else { + lp_true = log1p(exp(lp_true)); + lp_false += log1p(exp(-lp_false)); + } + lp_true*=-1; + lp_false*=-1; + if (corpus[i].first) { // true label + cll -= lp_true; + if (g) { + // g -= corpus[i].second * exp(lp_false); + GradAdd(corpus[i].second, -exp(lp_false), g); + (*g)[0] -= exp(lp_false); // bias + } + } else { // false label + cll -= lp_false; + if (g) { + // g += corpus[i].second * exp(lp_true); + GradAdd(corpus[i].second, exp(lp_true), g); + (*g)[0] += exp(lp_true); // bias + } + } + } + return cll; +} + int main(int argc, char** argv) { po::variables_map conf; InitCommandLine(argc, argv, &conf); string line; - vector<pair<bool, SparseVector<double> > > training; - int lc = 0; - bool flag = false; + vector<pair<bool, SparseVector<double> > > training, testing; SparseVector<double> old_weights; const double psi = conf["interpolation"].as<double>(); if (psi < 0.0 || psi > 1.0) { cerr << "Invalid interpolation weight: " << psi << endl; } @@ -75,20 +143,11 @@ int main(int argc, char** argv) { w.InitFromFile(conf["weights"].as<string>()); w.InitSparseVector(&old_weights); } - while(getline(cin, line)) { - ++lc; - if (lc % 1000 == 0) { cerr << '.'; flag = true; } - if (lc % 40000 == 0) { cerr << " [" << lc << "]\n"; flag = false; } - if (line.empty()) continue; - const size_t ks = line.find("\t"); - assert(string::npos != ks); - assert(ks == 1); - const bool y = line[0] == '1'; - SparseVector<double> x; - ParseSparseVector(line, ks + 1, &x); - training.push_back(make_pair(y, x)); + ReadCorpus(&cin, &training); + if (conf.count("testset")) { + ReadFile rf(conf["testset"].as<string>()); + ReadCorpus(rf.stream(), &testing); } - if (flag) cerr << endl; cerr << "Number of features: " << FD::NumFeats() << endl; vector<double> x(FD::NumFeats(), 0.0); // x[0] is bias @@ -96,44 +155,23 @@ int main(int argc, char** argv) { it != old_weights.end(); ++it) x[it->first] = it->second; vector<double> vg(FD::NumFeats(), 0.0); - SparseVector<double> g; bool converged = false; LBFGSOptimizer opt(FD::NumFeats(), conf["memory_buffers"].as<unsigned>()); - double ppl = 0; while(!converged) { - double cll = 0; - double dbias = 0; - g.clear(); - for (int i = 0; i < training.size(); ++i) { - const double dotprod = training[i].second.dot(x) + x[0]; // x[0] is bias - double lp_false = dotprod; - double lp_true = -dotprod; - if (0 < lp_true) { - lp_true += log1p(exp(-lp_true)); - lp_false = log1p(exp(lp_false)); - } else { - lp_true = log1p(exp(lp_true)); - lp_false += log1p(exp(-lp_false)); - } - lp_true*=-1; - lp_false*=-1; - if (training[i].first) { // true label - cll -= lp_true; - ppl += lp_true / log(2); - g -= training[i].second * exp(lp_false); - dbias -= exp(lp_false); - } else { // false label - cll -= lp_false; - ppl += lp_false / log(2); - g += training[i].second * exp(lp_true); - dbias += exp(lp_true); - } - } + double cll = TrainingInference(x, training, &vg); + double ppl = cll / log(2); ppl /= training.size(); - ppl = pow(2.0, - ppl); - vg.clear(); - g.init_vector(&vg); - vg[0] = dbias; + ppl = pow(2.0, ppl); + double tppl = 0.0; + + // evaluate optional held-out test set + if (testing.size()) { + tppl = TrainingInference(x, testing) / log(2); + tppl /= testing.size(); + tppl = pow(2.0, tppl); + } + + // handle regularizer #if 1 const double sigsq = conf["sigma_squared"].as<double>(); double norm = 0; @@ -148,7 +186,7 @@ int main(int argc, char** argv) { double reg = 0; #endif cll += reg; - cerr << cll << " (REG=" << reg << ")\tPPL=" << ppl << "\t"; + cerr << cll << " (REG=" << reg << ")\tPPL=" << ppl << "\t TEST_PPL=" << tppl << "\t"; try { vector<double> old_x = x; do { |