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// PPMLanguageModel.h
//
/////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 1999-2004 David Ward
//
/////////////////////////////////////////////////////////////////////////////
#ifndef __WordLanguageModel_h__
#define __WordLanguageModel_h__
#include <cstdlib>
#include "../../Common/NoClones.h"
#include "../../Common/Allocators/PooledAlloc.h"
#include "PPMLanguageModel.h"
#include "../SettingsStore.h"
#include "../Alphabet/AlphInfo.h"
#include "../Alphabet/AlphabetMap.h"
#include <vector>
#include <map>
#include <string>
#include <stdio.h>
//static char dumpTrieStr[40000];
//const int maxcont =200;
namespace Dasher {
/// \ingroup LM
/// \{
///
/// Language model using words
///
class CWordLanguageModel:public CLanguageModel, protected CSettingsUser {
public:
CWordLanguageModel(CSettingsUser *pCreator, const CAlphInfo *pAlph, const CAlphabetMap *pAlphMap);
virtual ~ CWordLanguageModel();
Context CreateEmptyContext();
void ReleaseContext(Context context);
Context CloneContext(Context context);
virtual void GetProbs(Context Context, std::vector < unsigned int >&Probs, int iNorm, int iUniform) const;
virtual void EnterSymbol(Context context, int Symbol);
virtual void LearnSymbol(Context context, int Symbol);
private:
class CWordnode {
public:
CWordnode * find_symbol(int sym)const;
CWordnode *child;
CWordnode *next;
CWordnode *vine;
unsigned int count;
int sbl;
CWordnode(int sym);
CWordnode();
void RecursiveDump(std::ofstream & file);
};
class CWordContext {
public:
CWordContext(CWordContext const &input) {
head = input.head;
word_head = input.word_head;
current_word = input.current_word;
order = input.order;
word_order = input.word_order;
}
CWordContext(CWordnode * _head = 0, int _order = 0): head(_head), order(_order), word_head(_head), word_order(0)
{}; // FIXME - doesn't work if we're trying to create a non-empty context
~CWordContext() {
};
void dump();
CWordnode *head;
int order;
std::string current_word;
CWordnode *word_head;
int word_order;
std::vector < unsigned int >oSpellingProbs;
int m_iSpellingNorm;
double m_dSpellingFactor;
/// Pointer to the letter based model - note that we don't
/// actually own this, so don't delete it
CPPMLanguageModel *m_pSpellingModel;
///
/// The corresponding context in the spelling model
CPPMLanguageModel::Context oSpellingContext;
};
CWordnode *AddSymbolToNode(CWordnode * pNode, symbol sym, int *update, bool bLearn);
void AddSymbol(CWordContext & context, symbol sym, bool bLearn);
void CollapseContext(CWordContext & context, bool bLearn);
int lookup_word(const std::string & w);
int lookup_word_const(const std::string & w) const;
const CAlphabetMap *m_pAlphMap;
const int m_iSpaceSymbol;
CWordContext *m_rootcontext;
CWordnode *m_pRoot;
std::map < std::string, int >dict; // Dictionary
int nextid;
int iWordStart;
int wordidx;
int NodesAllocated;
int max_order;
CPPMLanguageModel *pSpellingModel; // Use this to predict the spellings of new words
mutable CSimplePooledAlloc < CWordnode > m_NodeAlloc;
CPooledAlloc < CWordContext > m_ContextAlloc;
};
/// \}
////////////////////////////////////////////////////////////////////////
// Inline functions
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
inline Dasher::CWordLanguageModel::CWordnode::CWordnode(symbol sym):sbl(sym) {
child = next = vine = 0;
count = 1;
}
////////////////////////////////////////////////////////////////////////
inline CWordLanguageModel::CWordnode::CWordnode() {
child = next = vine = 0;
count = 1;
}
///////////////////////////////////////////////////////////////////
inline CLanguageModel::Context CWordLanguageModel::CreateEmptyContext() {
return CloneContext((Context)m_rootcontext);
}
///////////////////////////////////////////////////////////////////
inline CLanguageModel::Context CWordLanguageModel::CloneContext(Context Copy) {
CWordContext *pCont = m_ContextAlloc.Alloc();
CWordContext *pCopy = (CWordContext *) Copy;
*pCont = *pCopy;
// Create a clone of the spelling context
pCont->oSpellingContext = pCont->m_pSpellingModel->CloneContext(pCopy->oSpellingContext);
return (Context) pCont;
}
///////////////////////////////////////////////////////////////////
inline void CWordLanguageModel::ReleaseContext(Context release) {
// Urgh!
CWordContext *pCont(reinterpret_cast<CWordContext *>(release));
pCont->m_pSpellingModel->ReleaseContext(pCont->oSpellingContext);
m_ContextAlloc.Free(pCont);
}
///////////////////////////////////////////////////////////////////
} // end namespace Dasher
#endif /* #ifndef __WordLanguageModel_H__ */
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