mirror of
https://github.com/moses-smt/mosesdecoder.git
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66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
/***********************************************************************
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Moses - statistical machine translation system
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Copyright (C) 2006-2012 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 "rule_collection.h"
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#include "syntax-common/pcfg.h"
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#include <cmath>
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namespace MosesTraining
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{
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namespace Syntax
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{
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namespace PCFG
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{
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void RuleCollection::Add(std::size_t lhs, const std::vector<std::size_t> &rhs)
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{
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++collection_[lhs][rhs];
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}
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void RuleCollection::CreatePcfg(Pcfg &pcfg)
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{
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std::vector<std::size_t> key;
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for (const_iterator p = begin(); p != end(); ++p) {
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std::size_t lhs = p->first;
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const RhsCountMap &rhs_counts = p->second;
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std::size_t total = 0;
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for (RhsCountMap::const_iterator q = rhs_counts.begin();
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q != rhs_counts.end(); ++q) {
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total += q->second;
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}
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for (RhsCountMap::const_iterator q = rhs_counts.begin();
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q != rhs_counts.end(); ++q) {
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const std::vector<std::size_t> &rhs = q->first;
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std::size_t count = q->second;
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double score = std::log(static_cast<double>(count) /
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static_cast<double>(total));
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key.clear();
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key.push_back(lhs);
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key.insert(key.end(), rhs.begin(), rhs.end());
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pcfg.Add(key, score);
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}
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}
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}
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} // namespace PCFG
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} // namespace Syntax
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} // namespace MosesTraining
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