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