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/*
* LanguageModel.h
*
* Created on: 29 Oct 2015
* Author: hieu
*/
#pragma once
#include "../FF/StatefulFeatureFunction.h"
#include "../TypeDef.h"
#include "../MorphoTrie/MorphTrie.h"
#include "../legacy/Factor.h"
#include "../legacy/Util2.h"
namespace Moses2
{
////////////////////////////////////////////////////////////////////////////////////////
struct LMScores
{
LMScores()
{
}
LMScores(const LMScores ©) :
prob(copy.prob), backoff(copy.backoff)
{
}
LMScores(float inProb, float inBackoff) :
prob(inProb), backoff(inBackoff)
{
}
void Debug(std::ostream &out, const System &system) const
{
out << "(" << prob << "," << backoff << ")" << std::flush;
}
float prob, backoff;
};
////////////////////////////////////////////////////////////////////////////////////////
class LanguageModel: public StatefulFeatureFunction
{
public:
LanguageModel(size_t startInd, const std::string &line);
virtual ~LanguageModel();
virtual void Load(System &system);
virtual void SetParameter(const std::string& key, const std::string& value);
virtual FFState* BlankState(MemPool &pool, const System &sys) const;
virtual void EmptyHypothesisState(FFState &state, const ManagerBase &mgr,
const InputType &input, const Hypothesis &hypo) const;
virtual void
EvaluateInIsolation(MemPool &pool, const System &system, const Phrase<Moses2::Word> &source,
const TargetPhraseImpl &targetPhrase, Scores &scores,
SCORE &estimatedScore) const;
virtual void
EvaluateInIsolation(MemPool &pool, const System &system, const Phrase<SCFG::Word> &source,
const TargetPhrase<SCFG::Word> &targetPhrase, Scores &scores,
SCORE &estimatedScore) const;
virtual void EvaluateWhenApplied(const ManagerBase &mgr,
const Hypothesis &hypo, const FFState &prevState, Scores &scores,
FFState &state) const;
virtual void EvaluateWhenApplied(const SCFG::Manager &mgr,
const SCFG::Hypothesis &hypo, int featureID, Scores &scores,
FFState &state) const;
protected:
std::string m_path;
FactorType m_factorType;
size_t m_order;
MorphTrie<const Factor*, LMScores> m_root;
SCORE m_oov;
const Factor *m_bos;
const Factor *m_eos;
void ShiftOrPush(std::vector<const Factor*> &context,
const Factor *factor) const;
std::pair<SCORE, void*> Score(
const std::vector<const Factor*> &context) const;
SCORE BackoffScore(const std::vector<const Factor*> &context) const;
void DebugContext(const std::vector<const Factor*> &context) const;
};
}
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