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// memscore - in-memory phrase scoring for Statistical Machine Translation
// Christian Hardmeier, FBK-irst, Trento, 2010
// $Id$
#ifndef SCORER_H
#define SCORER_H
#include "memscore.h"
class PhraseScorerFactory
{
private:
PhraseTable &phrase_table_;
public:
explicit PhraseScorerFactory(PhraseTable &phrase_table) :
phrase_table_(phrase_table) {}
PhraseScorer *create_scorer(const char *argv[], int &argp, bool reverse);
PhraseTable &get_phrase_table() const {
return phrase_table_;
}
static const std::vector<String> &scorer_list();
};
class PhraseScorer
{
protected:
PhraseTable &phrase_table_;
bool reverse_;
explicit PhraseScorer(PhraseTable &pt, bool reverse) :
phrase_table_(!reverse ? pt : pt.reverse()), reverse_(reverse) {}
PhraseTable::iterator get_pair(Phrase src, Phrase tgt) {
PhraseTable::iterator it = phrase_table_.find(std::make_pair(src, tgt));
assert(it != phrase_table_.end());
return it;
}
private:
virtual void do_score_phrases() {}
virtual Score do_get_score(const PhraseTable::const_iterator &it) = 0;
public:
virtual ~PhraseScorer() {}
virtual Score get_discount() {}
void score_phrases() {
do_score_phrases();
}
Score get_score(const PhrasePairCounts::const_iterator &it) {
return do_get_score(phrase_table_.find(it));
}
Score get_score(const PhraseTable::const_iterator &it) {
return do_get_score(it);
}
Score get_score(Phrase src, Phrase tgt) {
PhraseTable::const_iterator it = get_pair(src, tgt);
return do_get_score(it);
}
};
#endif
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