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/***********************************************************************
Moses - statistical machine translation system
Copyright (C) 2006-2011 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
***********************************************************************/
#include "ChartCell.h"
#include "ChartCellCollection.h"
#include "ChartTranslationOption.h"
#include "ChartTranslationOptionCollection.h"
#include "DotChart.h"
#include "RuleCubeItem.h"
#include "RuleCubeQueue.h"
#include "WordsRange.h"
#include "Util.h"
#include <boost/functional/hash.hpp>
namespace Moses
{
std::size_t hash_value(const HypothesisDimension &dimension)
{
boost::hash<const ChartHypothesis*> hasher;
return hasher(dimension.GetHypothesis());
}
RuleCubeItem::RuleCubeItem(const ChartTranslationOption &transOpt,
const ChartCellCollection &allChartCells)
: m_translationDimension(0,
transOpt.GetTargetPhraseCollection().GetCollection())
, m_hypothesis(0)
{
CreateHypothesisDimensions(transOpt.GetDottedRule(), allChartCells);
}
// create the RuleCube from an existing one, differing only in one dimension
RuleCubeItem::RuleCubeItem(const RuleCubeItem ©, int hypoDimensionIncr)
: m_translationDimension(copy.m_translationDimension)
, m_hypothesisDimensions(copy.m_hypothesisDimensions)
, m_hypothesis(0)
{
if (hypoDimensionIncr == -1) {
m_translationDimension.IncrementPos();
} else {
HypothesisDimension &dimension = m_hypothesisDimensions[hypoDimensionIncr];
dimension.IncrementPos();
}
}
RuleCubeItem::~RuleCubeItem()
{
delete m_hypothesis;
}
void RuleCubeItem::EstimateScore()
{
m_score = m_translationDimension.GetTargetPhrase()->GetFutureScore();
std::vector<HypothesisDimension>::const_iterator p;
for (p = m_hypothesisDimensions.begin();
p != m_hypothesisDimensions.end(); ++p) {
m_score += p->GetHypothesis()->GetTotalScore();
}
}
void RuleCubeItem::CreateHypothesis(const ChartTranslationOption &transOpt,
ChartManager &manager)
{
m_hypothesis = new ChartHypothesis(transOpt, *this, manager);
m_hypothesis->CalcScore();
m_score = m_hypothesis->GetTotalScore();
}
ChartHypothesis *RuleCubeItem::ReleaseHypothesis()
{
CHECK(m_hypothesis);
ChartHypothesis *hypo = m_hypothesis;
m_hypothesis = 0;
return hypo;
}
// for each non-terminal, create a ordered list of matching hypothesis from the
// chart
void RuleCubeItem::CreateHypothesisDimensions(
const DottedRule &dottedRule,
const ChartCellCollection &allChartCells)
{
CHECK(!dottedRule.IsRoot());
const DottedRule *prev = dottedRule.GetPrev();
if (!prev->IsRoot()) {
CreateHypothesisDimensions(*prev, allChartCells);
}
// only deal with non-terminals
if (dottedRule.IsNonTerminal()) {
// get a sorted list of the underlying hypotheses
const ChartCellLabel &cellLabel = dottedRule.GetChartCellLabel();
const ChartHypothesisCollection *hypoColl = cellLabel.GetStack();
CHECK(hypoColl);
const HypoList &hypoList = hypoColl->GetSortedHypotheses();
// there have to be hypothesis with the desired non-terminal
// (otherwise the rule would not be considered)
CHECK(!hypoList.empty());
// create a list of hypotheses that match the non-terminal
HypothesisDimension dimension(0, hypoList);
// add them to the vector for such lists
m_hypothesisDimensions.push_back(dimension);
}
}
bool RuleCubeItem::operator<(const RuleCubeItem &compare) const
{
if (m_translationDimension == compare.m_translationDimension) {
return m_hypothesisDimensions < compare.m_hypothesisDimensions;
}
return m_translationDimension < compare.m_translationDimension;
}
}
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