mosesdecoder/moses/PartialTranslOptColl.h

97 lines
3.0 KiB
C++

// $Id$
/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (C) 2006 University of Edinburgh
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
***********************************************************************/
#ifndef moses_PartialTranslOptColl_h
#define moses_PartialTranslOptColl_h
#include <list>
#include <iostream>
#include "TranslationOption.h"
#include "Util.h"
#include "StaticData.h"
#include "FactorTypeSet.h"
namespace Moses
{
/** Contains partial translation options, while these are constructed in the class TranslationOption.
* The factored translation model allows for multiple translation and
* generation steps during a single Hypothesis expansion. For efficiency,
* all these expansions are precomputed and stored as TranslationOption.
* The expansion process itself may be still explode, so efficient handling
* of partial translation options during expansion is required.
* This class assists in this tasks by implementing pruning.
* This implementation is similar to the one in HypothesisStack.
*/
class PartialTranslOptColl
{
friend std::ostream& operator<<(std::ostream& out, const PartialTranslOptColl& possibleTranslation);
protected:
typedef std::vector<TranslationOption*> Coll;
Coll m_list;
float m_bestScore; /**< score of the best translation option */
float m_worstScore; /**< score of the worse translation option */
size_t m_maxSize; /**< maximum number of translation options allowed */
size_t m_totalPruned; /**< number of options pruned */
public:
typedef Coll::iterator iterator;
typedef Coll::const_iterator const_iterator;
const_iterator begin() const {
return m_list.begin();
}
const_iterator end() const {
return m_list.end();
}
PartialTranslOptColl();
/** destructor, cleans out list */
~PartialTranslOptColl() {
RemoveAllInColl( m_list );
}
void AddNoPrune(TranslationOption *partialTranslOpt);
void Add(TranslationOption *partialTranslOpt);
void Prune();
/** returns list of translation options */
const std::vector<TranslationOption*>& GetList() const {
return m_list;
}
/** clear out the list */
void DetachAll() {
m_list.clear();
}
/** return number of pruned partial hypotheses */
size_t GetPrunedCount() {
return m_totalPruned;
}
};
}
#endif