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113 lines
4.1 KiB
C++
113 lines
4.1 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_DecodeStep_h
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#define moses_DecodeStep_h
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#include "util/check.hh"
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#include "TypeDef.h"
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#include "Dictionary.h"
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namespace Moses
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{
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class DecodeFeature;
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class PhraseDictionaryFeature;
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class GenerationDictionary;
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class TranslationOption;
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class TranslationOptionCollection;
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class PartialTranslOptColl;
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class FactorCollection;
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class InputType;
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class TranslationSystem;
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/** Specification for a decoding step.
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* The factored translation model consists of Translation and Generation
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* steps, which consult a Dictionary of phrase translations or word
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* generations. This class implements the specification for one of these
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* steps, both the DecodeType and a pointer to the Translation or Generation Feature
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**/
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class DecodeStep
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{
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protected:
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FactorMask m_outputFactors; //! mask of what factors exist on the output side after this decode step
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std::vector<FactorType> m_conflictFactors; //! list of the factors that may conflict during this step
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std::vector<FactorType> m_newOutputFactors; //! list of the factors that are new in this step, may be empty
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const DecodeFeature* m_decodeFeature;
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public:
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DecodeStep(); //! not implemented
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DecodeStep(const DecodeFeature *featurePtr, const DecodeStep* prevDecodeStep);
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virtual ~DecodeStep();
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//! mask of factors that are present after this decode step
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const FactorMask& GetOutputFactorMask() const {
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return m_outputFactors;
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}
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//! returns true if this decode step must match some pre-existing factors
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bool IsFilteringStep() const {
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return !m_conflictFactors.empty();
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}
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//! returns true if this decode step produces one or more new factors
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bool IsFactorProducingStep() const {
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return !m_newOutputFactors.empty();
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}
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/*! returns a list (possibly empty) of the (target side) factors that
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* are produced in this decoding step. For example, if a previous step
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* generated factor 1, and this step generates 1,2, then only 2 will be
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* in the returned vector. */
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const std::vector<FactorType>& GetNewOutputFactors() const {
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return m_newOutputFactors;
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}
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/*! returns a list (possibly empty) of the (target side) factors that
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* are produced BUT ALREADY EXIST and therefore must be checked for
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* conflict or compatibility */
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const std::vector<FactorType>& GetConflictFactors() const {
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return m_conflictFactors;
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}
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/*! returns phrase table feature for translation step */
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const PhraseDictionaryFeature* GetPhraseDictionaryFeature() const;
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/*! returns generation table feature for generation step */
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const GenerationDictionary* GetGenerationDictionaryFeature() const;
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/*! Given an input TranslationOption, extend it in some way (put results in outputPartialTranslOptColl) */
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virtual void Process(const TranslationSystem* system,
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const TranslationOption &inputPartialTranslOpt
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, const DecodeStep &decodeStep
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, PartialTranslOptColl &outputPartialTranslOptColl
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, TranslationOptionCollection *toc
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, bool adhereTableLimit) const = 0;
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/** Do any sentence specific initialisation */
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virtual void InitializeBeforeSentenceProcessing(InputType const&) const {}
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};
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}
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#endif
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