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#include "translator.h"
#include <sstream>
#include <boost/shared_ptr.hpp>
#include "sentence_metadata.h"
#include "hg.h"
#include "hg_io.h"
#include "tdict.h"
using namespace std;
struct RescoreTranslatorImpl {
RescoreTranslatorImpl(const boost::program_options::variables_map& conf) :
goal_sym(conf["goal"].as<string>()),
kGOAL_RULE(new TRule("[Goal] ||| [" + goal_sym + ",1] ||| [1]")),
kGOAL(TD::Convert("Goal") * -1) {
}
bool Translate(const string& input,
const vector<double>& weights,
Hypergraph* forest) {
if (input == "{}") return false;
if (input.find("{\"rules\"") == 0) {
istringstream is(input);
Hypergraph src_cfg_hg;
if (!HypergraphIO::ReadFromJSON(&is, forest)) {
cerr << "Parse error while reading HG from JSON.\n";
abort();
}
} else {
cerr << "Can only read HG input from JSON: use training/grammar_convert\n";
abort();
}
Hypergraph::TailNodeVector tail(1, forest->nodes_.size() - 1);
Hypergraph::Node* goal = forest->AddNode(kGOAL);
Hypergraph::Edge* hg_edge = forest->AddEdge(kGOAL_RULE, tail);
forest->ConnectEdgeToHeadNode(hg_edge, goal);
forest->Reweight(weights);
return true;
}
const string goal_sym;
const TRulePtr kGOAL_RULE;
const WordID kGOAL;
};
RescoreTranslator::RescoreTranslator(const boost::program_options::variables_map& conf) :
pimpl_(new RescoreTranslatorImpl(conf)) {}
bool RescoreTranslator::TranslateImpl(const string& input,
SentenceMetadata* smeta,
const vector<double>& weights,
Hypergraph* minus_lm_forest) {
smeta->SetSourceLength(0); // don't know how to compute this
return pimpl_->Translate(input, weights, minus_lm_forest);
}
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