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125 lines
3.7 KiB
C++
125 lines
3.7 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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#pragma once
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#include <iostream>
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#include <ostream>
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#include <set>
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#include <vector>
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#include <cstdlib>
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#include <boost/functional/hash.hpp>
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namespace Moses
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{
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class AlignmentInfoCollection;
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/** Collection of non-terminal alignment pairs, ordered by source index.
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* Usually held by a TargetPhrase to map non-terms in hierarchical/syntax models
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*/
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class AlignmentInfo
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{
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friend std::ostream& operator<<(std::ostream &, const AlignmentInfo &);
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friend struct AlignmentInfoOrderer;
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friend struct AlignmentInfoHasher;
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friend class AlignmentInfoCollection;
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public:
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typedef std::set<std::pair<size_t,size_t> > CollType;
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typedef std::vector<size_t> NonTermIndexMap;
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typedef CollType::const_iterator const_iterator;
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const_iterator begin() const { return m_collection.begin(); }
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const_iterator end() const { return m_collection.end(); }
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void Add(size_t sourcePos, size_t targetPos) {
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m_collection.insert(std::pair<size_t, size_t>(sourcePos, targetPos));
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}
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/** Provides a map from target-side to source-side non-terminal indices.
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* The target-side index should be the rule symbol index (counting terminals).
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* The index returned is the rule non-terminal index (ignoring terminals).
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*/
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const NonTermIndexMap &GetNonTermIndexMap() const {
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return m_nonTermIndexMap;
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}
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// for phrase-based models, this contains all alignments, for hierarchical models only the NT alignments
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const CollType &GetAlignments() const {
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return m_collection;
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}
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size_t GetSize() const { return m_collection.size(); }
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std::vector< const std::pair<size_t,size_t>* > GetSortedAlignments() const;
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bool operator==(const AlignmentInfo& rhs) const
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{
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return m_collection == rhs.m_collection &&
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m_nonTermIndexMap == rhs.m_nonTermIndexMap;
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}
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private:
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//! AlignmentInfo objects should only be created by an AlignmentInfoCollection
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explicit AlignmentInfo(const std::set<std::pair<size_t,size_t> > &pairs);
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void BuildNonTermIndexMap();
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CollType m_collection;
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NonTermIndexMap m_nonTermIndexMap;
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};
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/** Define an arbitrary strict weak ordering between AlignmentInfo objects
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* for use by AlignmentInfoCollection.
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*/
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struct AlignmentInfoOrderer
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{
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bool operator()(const AlignmentInfo &a, const AlignmentInfo &b) const {
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if (a.m_collection == b.m_collection) {
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return a.m_nonTermIndexMap < b.m_nonTermIndexMap;
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}
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else {
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return a.m_collection < b.m_collection;
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}
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}
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};
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/**
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* Hashing functoid
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**/
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struct AlignmentInfoHasher
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{
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size_t operator()(const AlignmentInfo& a) const
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{
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size_t seed = 0;
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boost::hash_combine(seed,a.m_collection);
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boost::hash_combine(seed,a.m_nonTermIndexMap);
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return seed;
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}
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};
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inline size_t hash_value(const AlignmentInfo& a) {
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static AlignmentInfoHasher hasher;
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return hasher(a);
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}
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}
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