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// $Id$
/***********************************************************************
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
***********************************************************************/
#include <algorithm>
#include "TargetPhraseCollection.h"
using namespace std;
namespace Moses
{
// helper for sort
struct CompareTargetPhrase {
bool operator() (const TargetPhrase *a, const TargetPhrase *b) {
return a->GetFutureScore() > b->GetFutureScore();
}
};
void TargetPhraseCollection::NthElement(size_t tableLimit)
{
vector<TargetPhrase*>::iterator
iterMiddle = (tableLimit == 0 || m_collection.size() < tableLimit) ?m_collection.end() : m_collection.begin() + tableLimit;
//std::sort(m_collection.begin(), m_collection.end(), CompareTargetPhrase());
std::nth_element(m_collection.begin(), iterMiddle, m_collection.end(), CompareTargetPhrase());
}
void TargetPhraseCollection::Prune(bool adhereTableLimit, size_t tableLimit)
{
NthElement(tableLimit);
if (adhereTableLimit && m_collection.size() > tableLimit) {
for (size_t ind = tableLimit; ind < m_collection.size(); ++ind) {
TargetPhrase *targetPhrase = m_collection[ind];
delete targetPhrase;
}
m_collection.erase(m_collection.begin() + tableLimit, m_collection.end());
}
}
void TargetPhraseCollection::Sort(bool adhereTableLimit, size_t tableLimit)
{
std::vector<TargetPhrase*>::iterator iterMiddle;
iterMiddle = (tableLimit == 0 || m_collection.size() < tableLimit)
? m_collection.end()
: m_collection.begin()+tableLimit;
std::partial_sort(m_collection.begin(), iterMiddle, m_collection.end(),
CompareTargetPhrase());
if (adhereTableLimit && m_collection.size() > tableLimit) {
for (size_t i = tableLimit; i < m_collection.size(); ++i) {
TargetPhrase *targetPhrase = m_collection[i];
delete targetPhrase;
}
m_collection.erase(m_collection.begin()+tableLimit, m_collection.end());
}
}
}
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