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#include "translator.h"
#include <vector>
#include "hg.h"
#include "grammar.h"
#include "bottom_up_parser.h"
#include "sentence_metadata.h"
using namespace std;
Translator::~Translator() {}
struct SCFGTranslatorImpl {
SCFGTranslatorImpl(const boost::program_options::variables_map& conf) :
max_span_limit(conf["scfg_max_span_limit"].as<int>()),
add_pass_through_rules(conf.count("add_pass_through_rules")),
goal(conf["goal"].as<string>()),
default_nt(conf["scfg_default_nt"].as<string>()) {
vector<string> gfiles = conf["grammar"].as<vector<string> >();
for (int i = 0; i < gfiles.size(); ++i) {
cerr << "Reading SCFG grammar from " << gfiles[i] << endl;
TextGrammar* g = new TextGrammar(gfiles[i]);
g->SetMaxSpan(max_span_limit);
grammars.push_back(GrammarPtr(g));
}
if (!conf.count("scfg_no_hiero_glue_grammar"))
grammars.push_back(GrammarPtr(new GlueGrammar(goal, default_nt)));
if (conf.count("scfg_extra_glue_grammar"))
grammars.push_back(GrammarPtr(new GlueGrammar(conf["scfg_extra_glue_grammar"].as<string>())));
}
const int max_span_limit;
const bool add_pass_through_rules;
const string goal;
const string default_nt;
vector<GrammarPtr> grammars;
bool Translate(const string& input,
SentenceMetadata* smeta,
const vector<double>& weights,
Hypergraph* forest) {
vector<GrammarPtr> glist = grammars;
Lattice lattice;
LatticeTools::ConvertTextOrPLF(input, &lattice);
smeta->SetSourceLength(lattice.size());
if (add_pass_through_rules)
glist.push_back(GrammarPtr(new PassThroughGrammar(lattice, default_nt)));
ExhaustiveBottomUpParser parser(goal, glist);
if (!parser.Parse(lattice, forest))
return false;
forest->Reweight(weights);
return true;
}
};
SCFGTranslator::SCFGTranslator(const boost::program_options::variables_map& conf) :
pimpl_(new SCFGTranslatorImpl(conf)) {}
bool SCFGTranslator::Translate(const string& input,
SentenceMetadata* smeta,
const vector<double>& weights,
Hypergraph* minus_lm_forest) {
return pimpl_->Translate(input, smeta, weights, minus_lm_forest);
}
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