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Diffstat (limited to 'training/grammar_convert.cc')
| -rw-r--r-- | training/grammar_convert.cc | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/training/grammar_convert.cc b/training/grammar_convert.cc new file mode 100644 index 00000000..22ba0f46 --- /dev/null +++ b/training/grammar_convert.cc @@ -0,0 +1,316 @@ +#include <iostream> +#include <algorithm> +#include <sstream> + +#include <boost/lexical_cast.hpp> +#include <boost/program_options.hpp> + +#include "tdict.h" +#include "filelib.h" +#include "hg.h" +#include "hg_io.h" +#include "kbest.h" +#include "viterbi.h" +#include "weights.h" + +namespace po = boost::program_options; +using namespace std; + +WordID kSTART; + +void InitCommandLine(int argc, char** argv, po::variables_map* conf) { + po::options_description opts("Configuration options"); + opts.add_options() + ("input,i", po::value<string>()->default_value("-"), "Input file") + ("format,f", po::value<string>()->default_value("cfg"), "Input format. Values: cfg, json, split") + ("output,o", po::value<string>()->default_value("json"), "Output command. Values: json, 1best") + ("reorder,r", "Add Yamada & Knight (2002) reorderings") + ("weights,w", po::value<string>(), "Feature weights for k-best derivations [optional]") + ("collapse_weights,C", "Collapse order features into a single feature whose value is all of the locally applying feature weights") + ("k_derivations,k", po::value<int>(), "Show k derivations and their features") + ("max_reorder,m", po::value<int>()->default_value(999), "Move a constituent at most this far") + ("help,h", "Print this help message and exit"); + po::options_description clo("Command line options"); + po::options_description dcmdline_options; + dcmdline_options.add(opts); + + po::store(parse_command_line(argc, argv, dcmdline_options), *conf); + po::notify(*conf); + + if (conf->count("help") || conf->count("input") == 0) { + cerr << "\nUsage: grammar_convert [-options]\n\nConverts a grammar file (in Hiero format) into JSON hypergraph.\n"; + cerr << dcmdline_options << endl; + exit(1); + } +} + +int GetOrCreateNode(const WordID& lhs, map<WordID, int>* lhs2node, Hypergraph* hg) { + int& node_id = (*lhs2node)[lhs]; + if (!node_id) + node_id = hg->AddNode(lhs)->id_ + 1; + return node_id - 1; +} + +void FilterAndCheckCorrectness(int goal, Hypergraph* hg) { + if (goal < 0) { + cerr << "Error! [S] not found in grammar!\n"; + exit(1); + } + if (hg->nodes_[goal].in_edges_.size() != 1) { + cerr << "Error! [S] has more than one rewrite!\n"; + exit(1); + } + int old_size = hg->nodes_.size(); + hg->TopologicallySortNodesAndEdges(goal); + if (hg->nodes_.size() != old_size) { + cerr << "Warning! During sorting " << (old_size - hg->nodes_.size()) << " disappeared!\n"; + } +} + +void CreateEdge(const TRulePtr& r, const Hypergraph::TailNodeVector& tail, Hypergraph::Node* head_node, Hypergraph* hg) { + Hypergraph::Edge* new_edge = hg->AddEdge(r, tail); + hg->ConnectEdgeToHeadNode(new_edge, head_node); + new_edge->feature_values_ = r->scores_; +} + +// from a category label like "NP_2", return "NP" +string PureCategory(WordID cat) { + assert(cat < 0); + string c = TD::Convert(cat*-1); + size_t p = c.find("_"); + if (p == string::npos) return c; + return c.substr(0, p); +}; + +string ConstituentOrderFeature(const TRule& rule, const vector<int>& pi) { + const static string kTERM_VAR = "x"; + const vector<WordID>& f = rule.f(); + map<string, int> used; + vector<string> terms(f.size()); + for (int i = 0; i < f.size(); ++i) { + const string term = (f[i] < 0 ? PureCategory(f[i]) : kTERM_VAR); + int& count = used[term]; + if (!count) { + terms[i] = term; + } else { + ostringstream os; + os << term << count; + terms[i] = os.str(); + } + ++count; + } + ostringstream os; + os << PureCategory(rule.GetLHS()) << ':'; + for (int i = 0; i < f.size(); ++i) { + if (i > 0) os << '_'; + os << terms[pi[i]]; + } + return os.str(); +} + +bool CheckPermutationMask(const vector<int>& mask, const vector<int>& pi) { + assert(mask.size() == pi.size()); + + int req_min = -1; + int cur_max = 0; + int cur_mask = -1; + for (int i = 0; i < mask.size(); ++i) { + if (mask[i] != cur_mask) { + cur_mask = mask[i]; + req_min = cur_max - 1; + } + if (pi[i] > req_min) { + if (pi[i] > cur_max) cur_max = pi[i]; + } else { + return false; + } + } + + return true; +} + +void PermuteYKRecursive(int nodeid, const WordID& parent, const int max_reorder, Hypergraph* hg) { + Hypergraph::Node* node = &hg->nodes_[nodeid]; + if (node->in_edges_.size() != 1) { + cerr << "Multiple rewrites of [" << TD::Convert(node->cat_ * -1) << "] (parent is [" << TD::Convert(parent*-1) << "])\n"; + cerr << " not recursing!\n"; + return; + } + const int oe_index = node->in_edges_.front(); + const TRule& rule = *hg->edges_[oe_index].rule_; + const Hypergraph::TailNodeVector orig_tail = hg->edges_[oe_index].tail_nodes_; + const int tail_size = orig_tail.size(); + for (int i = 0; i < tail_size; ++i) { + PermuteYKRecursive(hg->edges_[oe_index].tail_nodes_[i], node->cat_, max_reorder, hg); + } + const vector<WordID>& of = rule.f_; + if (of.size() == 1) return; +// cerr << "Permuting [" << TD::Convert(node->cat_ * -1) << "]\n"; +// cerr << "ORIG: " << rule.AsString() << endl; + vector<WordID> pi(of.size(), 0); + for (int i = 0; i < pi.size(); ++i) pi[i] = i; + + vector<int> permutation_mask(of.size(), 0); + const bool dont_reorder_across_PU = true; // TODO add configuration + if (dont_reorder_across_PU) { + int cur = 0; + for (int i = 0; i < pi.size(); ++i) { + if (of[i] >= 0) continue; + const string cat = PureCategory(of[i]); + if (cat == "PU" || cat == "PU!H" || cat == "PUNC" || cat == "PUNC!H" || cat == "CC") { + ++cur; + permutation_mask[i] = cur; + ++cur; + } else { + permutation_mask[i] = cur; + } + } + } + int fid = FD::Convert(ConstituentOrderFeature(rule, pi)); + hg->edges_[oe_index].feature_values_.set_value(fid, 1.0); + while (next_permutation(pi.begin(), pi.end())) { + if (!CheckPermutationMask(permutation_mask, pi)) + continue; + vector<WordID> nf(pi.size(), 0); + Hypergraph::TailNodeVector tail(pi.size(), 0); + bool skip = false; + for (int i = 0; i < pi.size(); ++i) { + int dist = pi[i] - i; if (dist < 0) dist *= -1; + if (dist > max_reorder) { skip = true; break; } + nf[i] = of[pi[i]]; + tail[i] = orig_tail[pi[i]]; + } + if (skip) continue; + TRulePtr nr(new TRule(rule)); + nr->f_ = nf; + int fid = FD::Convert(ConstituentOrderFeature(rule, pi)); + nr->scores_.set_value(fid, 1.0); +// cerr << "PERM: " << nr->AsString() << endl; + CreateEdge(nr, tail, node, hg); + } +} + +void PermuteYamadaAndKnight(Hypergraph* hg, int max_reorder) { + assert(hg->nodes_.back().cat_ == kSTART); + assert(hg->nodes_.back().in_edges_.size() == 1); + PermuteYKRecursive(hg->nodes_.size() - 1, kSTART, max_reorder, hg); +} + +void CollapseWeights(Hypergraph* hg) { + int fid = FD::Convert("Reordering"); + for (int i = 0; i < hg->edges_.size(); ++i) { + Hypergraph::Edge& edge = hg->edges_[i]; + edge.feature_values_.clear(); + if (edge.edge_prob_ != prob_t::Zero()) { + edge.feature_values_.set_value(fid, log(edge.edge_prob_)); + } + } +} + +void ProcessHypergraph(const vector<double>& w, const po::variables_map& conf, const string& ref, Hypergraph* hg) { + if (conf.count("reorder")) + PermuteYamadaAndKnight(hg, conf["max_reorder"].as<int>()); + if (w.size() > 0) { hg->Reweight(w); } + if (conf.count("collapse_weights")) CollapseWeights(hg); + if (conf["output"].as<string>() == "json") { + HypergraphIO::WriteToJSON(*hg, false, &cout); + if (!ref.empty()) { cerr << "REF: " << ref << endl; } + } else { + vector<WordID> onebest; + ViterbiESentence(*hg, &onebest); + if (ref.empty()) { + cout << TD::GetString(onebest) << endl; + } else { + cout << TD::GetString(onebest) << " ||| " << ref << endl; + } + } + if (conf.count("k_derivations")) { + const int k = conf["k_derivations"].as<int>(); + KBest::KBestDerivations<vector<WordID>, ESentenceTraversal> kbest(*hg, k); + for (int i = 0; i < k; ++i) { + const KBest::KBestDerivations<vector<WordID>, ESentenceTraversal>::Derivation* d = + kbest.LazyKthBest(hg->nodes_.size() - 1, i); + if (!d) break; + cerr << log(d->score) << " ||| " << TD::GetString(d->yield) << " ||| " << d->feature_values << endl; + } + } +} + +int main(int argc, char **argv) { + kSTART = TD::Convert("S") * -1; + po::variables_map conf; + InitCommandLine(argc, argv, &conf); + string infile = conf["input"].as<string>(); + const bool is_split_input = (conf["format"].as<string>() == "split"); + const bool is_json_input = is_split_input || (conf["format"].as<string>() == "json"); + const bool collapse_weights = conf.count("collapse_weights"); + Weights wts; + vector<double> w; + if (conf.count("weights")) { + wts.InitFromFile(conf["weights"].as<string>()); + wts.InitVector(&w); + } + if (collapse_weights && !w.size()) { + cerr << "--collapse_weights requires a weights file to be specified!\n"; + exit(1); + } + ReadFile rf(infile); + istream* in = rf.stream(); + assert(*in); + int lc = 0; + Hypergraph hg; + map<WordID, int> lhs2node; + while(*in) { + string line; + ++lc; + getline(*in, line); + if (is_json_input) { + if (line.empty() || line[0] == '#') continue; + string ref; + if (is_split_input) { + size_t pos = line.rfind("}}"); + assert(pos != string::npos); + size_t rstart = line.find("||| ", pos); + assert(rstart != string::npos); + ref = line.substr(rstart + 4); + line = line.substr(0, pos + 2); + } + istringstream is(line); + if (HypergraphIO::ReadFromJSON(&is, &hg)) { + ProcessHypergraph(w, conf, ref, &hg); + hg.clear(); + } else { + cerr << "Error reading grammar from JSON: line " << lc << endl; + exit(1); + } + } else { + if (line.empty()) { + int goal = lhs2node[kSTART] - 1; + FilterAndCheckCorrectness(goal, &hg); + ProcessHypergraph(w, conf, "", &hg); + hg.clear(); + lhs2node.clear(); + continue; + } + if (line[0] == '#') continue; + if (line[0] != '[') { + cerr << "Line " << lc << ": bad format\n"; + exit(1); + } + TRulePtr tr(TRule::CreateRuleMonolingual(line)); + Hypergraph::TailNodeVector tail; + for (int i = 0; i < tr->f_.size(); ++i) { + WordID var_cat = tr->f_[i]; + if (var_cat < 0) + tail.push_back(GetOrCreateNode(var_cat, &lhs2node, &hg)); + } + const WordID lhs = tr->GetLHS(); + int head = GetOrCreateNode(lhs, &lhs2node, &hg); + Hypergraph::Edge* edge = hg.AddEdge(tr, tail); + edge->feature_values_ = tr->scores_; + Hypergraph::Node* node = &hg.nodes_[head]; + hg.ConnectEdgeToHeadNode(edge, node); + } + } +} + |