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// $Id$
#ifndef moses_DynamicCacheBasedLanguageModel_h
#define moses_DynamicCacheBasedLanguageModel_h
#include "moses/Util.h"
#include "FeatureFunction.h"
#ifdef WITH_THREADS
#include <boost/thread/shared_mutex.hpp>
#include <boost/thread/locks.hpp>
#endif
typedef std::pair<int, float> decaying_cache_value_t;
typedef std::map<std::string, decaying_cache_value_t > decaying_cache_t;
#define CBLM_QUERY_TYPE_UNDEFINED (-1)
#define CBLM_QUERY_TYPE_ALLSUBSTRINGS 0
#define CBLM_QUERY_TYPE_WHOLESTRING 1
#define CBLM_SCORE_TYPE_UNDEFINED (-1)
#define CBLM_SCORE_TYPE_HYPERBOLA 0
#define CBLM_SCORE_TYPE_POWER 1
#define CBLM_SCORE_TYPE_EXPONENTIAL 2
#define CBLM_SCORE_TYPE_COSINE 3
#define CBLM_SCORE_TYPE_HYPERBOLA_REWARD 10
#define CBLM_SCORE_TYPE_POWER_REWARD 11
#define CBLM_SCORE_TYPE_EXPONENTIAL_REWARD 12
#define PI 3.14159265
namespace Moses
{
class Range;
/** Calculates score for the Dynamic Cache-Based pseudo LM
*/
class DynamicCacheBasedLanguageModel : public StatelessFeatureFunction
{
// data structure for the cache;
// the key is the word and the value is the decaying score
decaying_cache_t m_cache;
size_t m_query_type; //way of querying the cache
size_t m_score_type; //way of scoring entries of the cache
std::string m_initfiles; // vector of files loaded in the initialization phase
std::string m_name; // internal name to identify this instance of the Cache-based pseudo LM
float m_lower_score; //lower_bound_score for no match
bool m_constant; //flag for setting a non-decaying cache
std::vector<float> precomputedScores;
unsigned int m_maxAge;
#ifdef WITH_THREADS
//multiple readers - single writer lock
mutable boost::shared_mutex m_cacheLock;
#endif
float decaying_score(unsigned int age);
void SetPreComputedScores();
float GetPreComputedScores(const unsigned int age);
float Evaluate_Whole_String( const TargetPhrase&) const;
float Evaluate_All_Substrings( const TargetPhrase&) const;
void Decay();
void Update(std::vector<std::string> words, int age);
void ClearEntries(std::vector<std::string> entries);
void Execute(std::vector<std::string> commands);
void Execute_Single_Command(std::string command);
void Load_Multiple_Files(std::vector<std::string> files);
void Load_Single_File(const std::string file);
void Insert(std::vector<std::string> ngrams);
// void EvaluateInIsolation(const Phrase&, const TargetPhrase&, ScoreComponentCollection&, ScoreComponentCollection& ) const;
void Print() const;
protected:
static DynamicCacheBasedLanguageModel* s_instance;
static std::map< const std::string, DynamicCacheBasedLanguageModel* > s_instance_map;
public:
DynamicCacheBasedLanguageModel(const std::string &line);
~DynamicCacheBasedLanguageModel();
inline const std::string GetName() {
return m_name;
};
inline void SetName(const std::string name) {
m_name = name;
}
static const DynamicCacheBasedLanguageModel* Instance(const std::string& name) {
if (s_instance_map.find(name) == s_instance_map.end()) {
return NULL;
}
return s_instance_map[name];
}
static DynamicCacheBasedLanguageModel* InstanceNonConst(const std::string& name) {
if (s_instance_map.find(name) == s_instance_map.end()) {
return NULL;
}
return s_instance_map[name];
}
static const DynamicCacheBasedLanguageModel& Instance() {
return *s_instance;
}
static DynamicCacheBasedLanguageModel& InstanceNonConst() {
return *s_instance;
}
bool IsUseable(const FactorMask &mask) const {
return true;
}
void Load();
void Load(const std::string filestr);
void Execute(std::string command);
void SetParameter(const std::string& key, const std::string& value);
void ExecuteDlt(std::map<std::string, std::string> dlt_meta);
void ClearEntries(std::string &entries);
void Insert(std::string &entries);
void Clear();
virtual void EvaluateInIsolation(const Phrase &source
, const TargetPhrase &targetPhrase
, ScoreComponentCollection &scoreBreakdown
, ScoreComponentCollection &estimatedScores) const;
void EvaluateWithSourceContext(const InputType &input
, const InputPath &inputPath
, const TargetPhrase &targetPhrase
, const StackVec *stackVec
, ScoreComponentCollection &scoreBreakdown
, ScoreComponentCollection *estimatedScores = NULL) const {
}
void EvaluateTranslationOptionListWithSourceContext(const InputType &input
, const TranslationOptionList &translationOptionList) const {
}
void EvaluateWhenApplied(const Hypothesis& hypo,
ScoreComponentCollection* accumulator) const {
}
void EvaluateWhenApplied(const ChartHypothesis &hypo,
ScoreComponentCollection* accumulator) const {
}
void SetQueryType(size_t type);
void SetScoreType(size_t type);
void SetMaxAge(unsigned int age);
};
}
#endif
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