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// MixtureLanguageModel.h
//
/////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2001-2005 David Ward
//
/////////////////////////////////////////////////////////////////////////////
#ifndef __LanguageModelling_MixtureLanguageModel_h__
#define __LanguageModelling_MixtureLanguageModel_h__
#include "LanguageModel.h"
#include "PPMLanguageModel.h"
#include "DictLanguageModel.h"
//#include <iostream>
#include <vector>
/////////////////////////////////////////////////////////////////////////////
namespace Dasher {
class CMixtureLanguageModel;
/// \ingroup LM
/// \{
class CMixtureLanguageModel:public CLanguageModel, protected CSettingsUser {
public:
/////////////////////////////////////////////////////////////////////////////
CMixtureLanguageModel(CSettingsUser *pCreator, const CAlphInfo *pAlph, const CAlphabetMap *pAlphMap)
: CLanguageModel(pAlph->iEnd-1), CSettingsUser(pCreator) {
// std::cout << m_pAlphabet << std::endl;
NextContext = 0;
lma = new CPPMLanguageModel(this, m_iNumSyms);
lmb = new CDictLanguageModel(this, pAlph, pAlphMap);
};
virtual ~ CMixtureLanguageModel() {
delete lma;
delete lmb;
};
/////////////////////////////////////////////////////////////////////////////
// Context creation/destruction
////////////////////////////////////////////////////////////////////////////
// FIXME - need to work out how to do this
// Create a context (empty)
virtual CLanguageModel::Context CreateEmptyContext();
virtual CLanguageModel::Context CloneContext(CLanguageModel::Context Context);
virtual void ReleaseContext(CLanguageModel::Context Context);
/////////////////////////////////////////////////////////////////////////////
// Context modifiers
////////////////////////////////////////////////////////////////////////////
// Update context with a character - only modifies context
virtual void EnterSymbol(CLanguageModel::Context context, int Symbol) {
lma->EnterSymbol(ContextMap.find(context)->second->GetContextA(), Symbol);
lmb->EnterSymbol(ContextMap.find(context)->second->GetContextB(), Symbol);
};
// Add character to the language model at the current context and update the context
// - modifies both the context and the LanguageModel
virtual void LearnSymbol(CLanguageModel::Context context, int Symbol) {
lma->LearnSymbol(ContextMap[context]->GetContextA(), Symbol);
lmb->LearnSymbol(ContextMap[context]->GetContextB(), Symbol);
};
/////////////////////////////////////////////////////////////////////////////
// Prediction
/////////////////////////////////////////////////////////////////////////////
// Get symbol probability distribution
virtual void GetProbs(CLanguageModel::Context context, std::vector < unsigned int >&Probs, int iNorm, int iUniform) const {
int iNumSymbols = GetSize();
Probs.resize(iNumSymbols);
std::vector < unsigned int >ProbsA(iNumSymbols);
std::vector < unsigned int >ProbsB(iNumSymbols);
int iNormA(iNorm * GetLongParameter(LP_LM_MIXTURE) / 100);
int iNormB(iNorm - iNormA);
// TODO: Fix uniform here
lma->GetProbs(ContextMap.find(context)->second->GetContextA(), ProbsA, iNormA, 0);
lmb->GetProbs(ContextMap.find(context)->second->GetContextB(), ProbsB, iNormB, 0);
for(int i(1); i < iNumSymbols; i++) {
Probs[i] = ProbsA[i] + ProbsB[i];
}};
private:
CLanguageModel * lma;
CLanguageModel *lmb;
class CMixtureContext {
public:
CMixtureContext(CLanguageModel * _lma, CLanguageModel * _lmb):lma(_lma), lmb(_lmb) {
ca = lma->CreateEmptyContext();
cb = lmb->CreateEmptyContext();
};
CMixtureContext(CLanguageModel * _lma, CLanguageModel * _lmb, CLanguageModel::Context _ca, CLanguageModel::Context _cb):lma(_lma), lmb(_lmb), ca(_ca), cb(_cb) {
};
~CMixtureContext() {
lma->ReleaseContext(ca);
lmb->ReleaseContext(cb);
};
CLanguageModel::Context GetContextA() {
return ca;
}
CLanguageModel::Context GetContextB() {
return cb;
}
private:
CLanguageModel * lma;
CLanguageModel *lmb;
CLanguageModel::Context ca;
CLanguageModel::Context cb;
};
int NextContext;
std::map < int, CMixtureContext * >ContextMap;
};
/// \}
///////////////////////////////////////////////////////////////////
inline CLanguageModel::Context CMixtureLanguageModel::CreateEmptyContext() {
CMixtureContext *pCont = new CMixtureContext(lma, lmb);
ContextMap[NextContext] = pCont;
++NextContext;
return NextContext - 1;
}
///////////////////////////////////////////////////////////////////
inline CLanguageModel::Context CMixtureLanguageModel::CloneContext(CLanguageModel::Context Copy) {
CMixtureContext *pCopy = ContextMap[Copy];
CMixtureContext *pCont = new CMixtureContext(lma, lmb, lma->CloneContext(pCopy->GetContextA()), lmb->CloneContext(pCopy->GetContextB()));
ContextMap[NextContext] = pCont;
++NextContext;
return NextContext - 1;
}
///////////////////////////////////////////////////////////////////
inline void CMixtureLanguageModel::ReleaseContext(CLanguageModel::Context release) {
// m_ContextAlloc.Free( (CMixtureContext*) release );
delete ContextMap[release];
ContextMap[release] = NULL;
}
}
///////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////
#endif // ndef __LanguageModelling_MixtureLanguageModel_h__
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