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123 lines
3.9 KiB
C++
123 lines
3.9 KiB
C++
/***********************************************************************
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Moses - statistical machine translation system
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Copyright (C) 2006-2011 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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#include "ChartCell.h"
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#include "ChartCellCollection.h"
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#include "ChartTranslationOptions.h"
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#include "ChartManager.h"
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#include "RuleCubeItem.h"
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#include "RuleCubeQueue.h"
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#include "Range.h"
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#include "Util.h"
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#include "util/exception.hh"
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#include <boost/functional/hash.hpp>
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namespace Moses
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{
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std::size_t hash_value(const HypothesisDimension &dimension)
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{
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boost::hash<const ChartHypothesis*> hasher;
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return hasher(dimension.GetHypothesis());
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}
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RuleCubeItem::RuleCubeItem(const ChartTranslationOptions &transOpt,
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const ChartCellCollection &/*allChartCells*/)
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: m_translationDimension(0, transOpt.GetTargetPhrases())
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, m_hypothesis(0)
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{
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CreateHypothesisDimensions(transOpt.GetStackVec());
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}
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// create the RuleCube from an existing one, differing only in one dimension
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RuleCubeItem::RuleCubeItem(const RuleCubeItem ©, int hypoDimensionIncr)
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: m_translationDimension(copy.m_translationDimension)
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, m_hypothesisDimensions(copy.m_hypothesisDimensions)
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, m_hypothesis(0)
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{
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if (hypoDimensionIncr == -1) {
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m_translationDimension.IncrementPos();
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} else {
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HypothesisDimension &dimension = m_hypothesisDimensions[hypoDimensionIncr];
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dimension.IncrementPos();
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}
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}
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RuleCubeItem::~RuleCubeItem()
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{
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delete m_hypothesis;
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}
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void RuleCubeItem::EstimateScore()
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{
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m_score = m_translationDimension.GetTranslationOption()->GetPhrase().GetFutureScore();
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std::vector<HypothesisDimension>::const_iterator p;
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for (p = m_hypothesisDimensions.begin();
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p != m_hypothesisDimensions.end(); ++p) {
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m_score += p->GetHypothesis()->GetFutureScore();
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}
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}
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void RuleCubeItem::CreateHypothesis(const ChartTranslationOptions &transOpt,
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ChartManager &manager)
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{
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m_hypothesis = new ChartHypothesis(transOpt, *this, manager);
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m_hypothesis->EvaluateWhenApplied();
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m_score = m_hypothesis->GetFutureScore();
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}
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ChartHypothesis *RuleCubeItem::ReleaseHypothesis()
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{
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UTIL_THROW_IF2(m_hypothesis == NULL, "Hypothesis is NULL");
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ChartHypothesis *hypo = m_hypothesis;
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m_hypothesis = NULL;
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return hypo;
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}
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// for each non-terminal, create a ordered list of matching hypothesis from the
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// chart
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void RuleCubeItem::CreateHypothesisDimensions(const StackVec &stackVec)
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{
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for (StackVec::const_iterator p = stackVec.begin(); p != stackVec.end();
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++p) {
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const HypoList *stack = (*p)->GetStack().cube;
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assert(stack);
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// there have to be hypothesis with the desired non-terminal
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// (otherwise the rule would not be considered)
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assert(!stack->empty());
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// create a list of hypotheses that match the non-terminal
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HypothesisDimension dimension(0, *stack);
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// add them to the vector for such lists
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m_hypothesisDimensions.push_back(dimension);
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}
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}
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bool RuleCubeItem::operator<(const RuleCubeItem &compare) const
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{
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if (m_translationDimension == compare.m_translationDimension) {
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return m_hypothesisDimensions < compare.m_hypothesisDimensions;
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}
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return m_translationDimension < compare.m_translationDimension;
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}
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}
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