📄 event.h

📁 Amis - A maximum entropy estimator 一个最大熵模型统计工具
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////////////////////////////////////////////////////////////////////////////  Copyright (c) 2000, Yusuke Miyao///  You may distribute under the terms of the Artistic License.//////  <id>$Id: Event.h,v 1.10 2003/05/16 08:20:14 yusuke Exp $</id>///  <collection>Maximum Entropy Estimator</collection>///  <name>Event.h</name>///  <overview>Event in ME Model</overview>/////////////////////////////////////////////////////////////////////////#ifndef Amis_Event_h_#define Amis_Event_h_#include <amis/configure.h>#include <amis/FeatureList.h>#include <amis/ErrorBase.h>#include <amis/Real.h>#include <amis/ModelBase.h>#include <amis/objstream.h>#include <amis/StringStream.h>#include <vector>#include <algorithm>AMIS_NAMESPACE_BEGINtypedef FeatureListFreq EventFreq;class IllegalEventError : public ErrorBase { public:  IllegalEventError( const std::string& s ) : ErrorBase( s ) {}  IllegalEventError( char* s ) : ErrorBase( s ) {}};///////////////////////////////////////////////////////////////////////// <classdef>/// <name>Event</name>/// <overview>An event</overview>/// <desc>/// This class describes an event object./// </desc>/// <body>template < class Feature >class Event {public:  typedef Feature FeatureType;  typedef typename Feature::FeatureFreq FeatureFreq;  //typedef FeatureList< Feature >* iterator;  //typedef const FeatureList< Feature >* const_iterator;  typedef typename std::vector< FeatureList<Feature> >::iterator iterator;  typedef typename std::vector< FeatureList<Feature> >::const_iterator const_iterator;  typedef typename std::vector< FeatureList<Feature> >::size_type size_type;  iterator begin() {    return feature_lists.begin();  }  const_iterator begin() const {    return feature_lists.begin();  }  iterator end() {    return feature_lists.end();  }  const_iterator end() const {    return feature_lists.end();  }private:#ifdef AMIS_JOINT_PROB  Real prob;#endif // AMIS_JOINT_PROB  EventFreq freq;  std::vector< FeatureList< Feature > > feature_lists;  int active_id;  static const int NULL_ACTIVE_ID = -1;public:  Event() {#ifdef AMIS_JOINT_PROB    prob = 1.0;#endif // AMIS_JOINT_PROB    freq = 0;    active_id = NULL_ACTIVE_ID;  }  ~Event() {}  void clear() {#ifdef AMIS_JOINT_PROB    prob = 1.0;#endif // AMIS_JOINT_PROB    freq = 0;    active_id = NULL_ACTIVE_ID;    feature_lists.resize( 0 );  }  void swap( Event< Feature >& event ) {#ifdef AMIS_JOINT_PROB    ::swap( prob, event.prob );#endif // AMIS_JOINT_PROB    ::swap( freq, event.freq );    feature_lists.swap( event.feature_lists );    ::swap( active_id, event.active_id );  }  void addFeatureList( const std::vector< Feature >& vec, FeatureListFreq f ) {    if ( f > 0 ) {      if ( active_id != NULL_ACTIVE_ID ) throw IllegalEventError( "Ambiguous event is disallowed" );      active_id = feature_lists.size();      feature_lists.push_back( FeatureList< Feature >( vec, 1 ) );      freq = f;    } else if ( f == 0 ) {      feature_lists.push_back( FeatureList< Feature >( vec, 0 ) );    } else {      throw IllegalEventError( "Event frequency must be positive" );    }  }  bool isValid() const {    return active_id != NULL_ACTIVE_ID;  }  const FeatureList< Feature >& observedEvent() const {    return feature_lists[ active_id ];  }  int observedEventID() const {    return active_id;  }  size_type size() const {    return feature_lists.size();  }  size_type numFeatureList() const {    return size();  }  const EventFreq eventFrequency() const {    return freq;  }  const FeatureList< Feature >& operator[]( int i ) const {    return feature_lists[ i ];  }  Real eventProbability() const {#ifdef AMIS_JOINT_PROB    return prob;#else // AMIS_JOINT_PROB    return 1.0;#endif // AMIS_JOINT_PROB  }  void setEventProbability( Real p ) {#ifdef AMIS_JOINT_PROB    prob = p;#else // AMIS_JOINT_PROB    // do nothing#endif // AMIS_JOINT_PROB  }  const FeatureListFreq frequency() const {    return freq;  }  const FeatureFreq maxFeatureCount() const {    FeatureFreq freq = Feature::MIN_FEATURE_FREQ;    for ( const_iterator it = begin(); it != end(); ++it ) {      freq = std::max( freq, it->featureCount() );    }    return freq;  }  bool isObserved( int i ) const {    if ( active_id == NULL_ACTIVE_ID ) throw IllegalEventError( "Observed feature list not found" );    return i == active_id;  }  bool isObserved( const_iterator fl ) const {    return isObserved( fl - begin() );  }  ////////////////////////////////////////////////////////////public:  void readObject( objstream& is ) {#ifdef AMIS_JOINT_PROB    is >> prob;#endif // AMIS_JOINT_PROB    is >> freq;    size_type num_fl;    is >> num_fl;    is >> active_id;    feature_lists.resize( num_fl );    for ( iterator it = begin();          it != end();          ++it ) {      it->readObject( is );    }  }  /// Read an object from a stream  void writeObject( objstream& os ) const {#ifdef AMIS_JOINT_PROB    os << prob;#endif // AMIS_JOINT_PROB    os << freq;    os << feature_lists.size();    os << active_id;    for ( const_iterator it = begin();          it != end();          ++it ) {      it->writeObject( os );    }   }  /// Write an object into a stream};AMIS_NAMESPACE_END/// </body>/// </classdef>#endif // Event_h_// end of Event.h
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