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