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mosesdecoder/phrase-extract/extract-rules-main.cpp
Rico Sennrich ae8b9cbfef glue grammar: alignment for <s> and </s>
2014-11-04 14:05:13 +00:00

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/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (C) 2009 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 <assert.h>
#include <cstdio>
#include <cstring>
#include <fstream>
#include <iostream>
#include <list>
#include <map>
#include <set>
#include <sstream>
#include <string>
#include <vector>
#include <limits>
#ifdef WIN32
// Include Visual Leak Detector
//#include <vld.h>
#endif
#include "ExtractedRule.h"
#include "Hole.h"
#include "HoleCollection.h"
#include "RuleExist.h"
#include "SentenceAlignmentWithSyntax.h"
#include "SyntaxTree.h"
#include "tables-core.h"
#include "XmlTree.h"
#include "InputFileStream.h"
#include "OutputFileStream.h"
using namespace std;
using namespace MosesTraining;
typedef vector< int > LabelIndex;
typedef map< int, int > WordIndex;
class ExtractTask
{
private:
SentenceAlignmentWithSyntax &m_sentence;
const RuleExtractionOptions &m_options;
Moses::OutputFileStream& m_extractFile;
Moses::OutputFileStream& m_extractFileInv;
Moses::OutputFileStream& m_extractFileContext;
Moses::OutputFileStream& m_extractFileContextInv;
vector< ExtractedRule > m_extractedRules;
// main functions
void extractRules();
void addRuleToCollection(ExtractedRule &rule);
void consolidateRules();
void writeRulesToFile();
// subs
void addRule( int, int, int, int, int, RuleExist &ruleExist);
void addHieroRule( int startT, int endT, int startS, int endS
, RuleExist &ruleExist, HoleCollection &holeColl, int numHoles, int initStartF, int wordCountT, int wordCountS);
void saveHieroPhrase( int startT, int endT, int startS, int endS
, HoleCollection &holeColl, LabelIndex &labelIndex, int countS);
string saveTargetHieroPhrase( int startT, int endT, int startS, int endS
, WordIndex &indexT, HoleCollection &holeColl, const LabelIndex &labelIndex, double &logPCFGScore, int countS);
string saveSourceHieroPhrase( int startT, int endT, int startS, int endS
, HoleCollection &holeColl, const LabelIndex &labelIndex);
void preprocessSourceHieroPhrase( int startT, int endT, int startS, int endS
, WordIndex &indexS, HoleCollection &holeColl, const LabelIndex &labelIndex);
void saveHieroAlignment( int startT, int endT, int startS, int endS
, const WordIndex &indexS, const WordIndex &indexT, HoleCollection &holeColl, ExtractedRule &rule);
void saveAllHieroPhrases( int startT, int endT, int startS, int endS, HoleCollection &holeColl, int countS);
inline string IntToString( int i ) {
stringstream out;
out << i;
return out.str();
}
public:
ExtractTask(SentenceAlignmentWithSyntax &sentence, const RuleExtractionOptions &options, Moses::OutputFileStream &extractFile, Moses::OutputFileStream &extractFileInv, Moses::OutputFileStream &extractFileContext, Moses::OutputFileStream &extractFileContextInv):
m_sentence(sentence),
m_options(options),
m_extractFile(extractFile),
m_extractFileInv(extractFileInv),
m_extractFileContext(extractFileContext),
m_extractFileContextInv(extractFileContextInv) {}
void Run();
};
// stats for glue grammar and unknown word label probabilities
void collectWordLabelCounts(SentenceAlignmentWithSyntax &sentence );
void writeGlueGrammar(const string &, RuleExtractionOptions &options, set< string > &targetLabelCollection, map< string, int > &targetTopLabelCollection);
void writeUnknownWordLabel(const string &);
int main(int argc, char* argv[])
{
cerr << "extract-rules, written by Philipp Koehn\n"
<< "rule extraction from an aligned parallel corpus\n";
RuleExtractionOptions options;
int sentenceOffset = 0;
#ifdef WITH_THREADS
int thread_count = 1;
#endif
if (argc < 5) {
cerr << "syntax: extract-rules corpus.target corpus.source corpus.align extract ["
<< " --GlueGrammar FILE"
<< " | --UnknownWordLabel FILE"
<< " | --OnlyDirect"
<< " | --MaxSpan[" << options.maxSpan << "]"
<< " | --MinHoleTarget[" << options.minHoleTarget << "]"
<< " | --MinHoleSource[" << options.minHoleSource << "]"
<< " | --MinWords[" << options.minWords << "]"
<< " | --MaxSymbolsTarget[" << options.maxSymbolsTarget << "]"
<< " | --MaxSymbolsSource[" << options.maxSymbolsSource << "]"
<< " | --MaxNonTerm[" << options.maxNonTerm << "]"
<< " | --MaxScope[" << options.maxScope << "]"
<< " | --SourceSyntax | --TargetSyntax"
<< " | --AllowOnlyUnalignedWords | --DisallowNonTermConsecTarget |--NonTermConsecSource | --NoNonTermFirstWord | --NoFractionalCounting"
<< " | --UnpairedExtractFormat"
<< " | --ConditionOnTargetLHS ]"
<< " | --BoundaryRules[" << options.boundaryRules << "]"
<< " | --FlexibilityScore\n";
exit(1);
}
char* &fileNameT = argv[1];
char* &fileNameS = argv[2];
char* &fileNameA = argv[3];
string fileNameGlueGrammar;
string fileNameUnknownWordLabel;
string fileNameExtract = string(argv[4]);
int optionInd = 5;
for(int i=optionInd; i<argc; i++) {
// maximum span length
if (strcmp(argv[i],"--MaxSpan") == 0) {
options.maxSpan = atoi(argv[++i]);
if (options.maxSpan < 1) {
cerr << "extract error: --maxSpan should be at least 1" << endl;
exit(1);
}
} else if (strcmp(argv[i],"--MinHoleTarget") == 0) {
options.minHoleTarget = atoi(argv[++i]);
if (options.minHoleTarget < 1) {
cerr << "extract error: --minHoleTarget should be at least 1" << endl;
exit(1);
}
} else if (strcmp(argv[i],"--MinHoleSource") == 0) {
options.minHoleSource = atoi(argv[++i]);
if (options.minHoleSource < 1) {
cerr << "extract error: --minHoleSource should be at least 1" << endl;
exit(1);
}
}
// maximum number of words in hierarchical phrase
else if (strcmp(argv[i],"--MaxSymbolsTarget") == 0) {
options.maxSymbolsTarget = atoi(argv[++i]);
if (options.maxSymbolsTarget < 1) {
cerr << "extract error: --MaxSymbolsTarget should be at least 1" << endl;
exit(1);
}
}
// maximum number of words in hierarchical phrase
else if (strcmp(argv[i],"--MaxSymbolsSource") == 0) {
options.maxSymbolsSource = atoi(argv[++i]);
if (options.maxSymbolsSource < 1) {
cerr << "extract error: --MaxSymbolsSource should be at least 1" << endl;
exit(1);
}
}
// minimum number of words in hierarchical phrase
else if (strcmp(argv[i],"--MinWords") == 0) {
options.minWords = atoi(argv[++i]);
if (options.minWords < 0) {
cerr << "extract error: --MinWords should be at least 0" << endl;
exit(1);
}
}
// maximum number of non-terminals
else if (strcmp(argv[i],"--MaxNonTerm") == 0) {
options.maxNonTerm = atoi(argv[++i]);
if (options.maxNonTerm < 1) {
cerr << "extract error: --MaxNonTerm should be at least 1" << endl;
exit(1);
}
}
// maximum scope (see Hopkins and Langmead (2010))
else if (strcmp(argv[i],"--MaxScope") == 0) {
options.maxScope = atoi(argv[++i]);
if (options.maxScope < 0) {
cerr << "extract error: --MaxScope should be at least 0" << endl;
exit(1);
}
} else if (strcmp(argv[i], "--GZOutput") == 0) {
options.gzOutput = true;
}
// allow consecutive non-terminals (X Y | X Y)
else if (strcmp(argv[i],"--TargetSyntax") == 0) {
options.targetSyntax = true;
} else if (strcmp(argv[i],"--SourceSyntax") == 0) {
options.sourceSyntax = true;
} else if (strcmp(argv[i],"--AllowOnlyUnalignedWords") == 0) {
options.requireAlignedWord = false;
} else if (strcmp(argv[i],"--DisallowNonTermConsecTarget") == 0) {
options.nonTermConsecTarget = false;
} else if (strcmp(argv[i],"--NonTermConsecSource") == 0) {
options.nonTermConsecSource = true;
} else if (strcmp(argv[i],"--NoNonTermFirstWord") == 0) {
options.nonTermFirstWord = false;
} else if (strcmp(argv[i],"--OnlyOutputSpanInfo") == 0) {
options.onlyOutputSpanInfo = true;
} else if (strcmp(argv[i],"--OnlyDirect") == 0) {
options.onlyDirectFlag = true;
} else if (strcmp(argv[i],"--GlueGrammar") == 0) {
options.glueGrammarFlag = true;
if (++i >= argc) {
cerr << "ERROR: Option --GlueGrammar requires a file name" << endl;
exit(0);
}
fileNameGlueGrammar = string(argv[i]);
cerr << "creating glue grammar in '" << fileNameGlueGrammar << "'" << endl;
} else if (strcmp(argv[i],"--UnknownWordLabel") == 0) {
options.unknownWordLabelFlag = true;
if (++i >= argc) {
cerr << "ERROR: Option --UnknownWordLabel requires a file name" << endl;
exit(0);
}
fileNameUnknownWordLabel = string(argv[i]);
cerr << "creating unknown word labels in '" << fileNameUnknownWordLabel << "'" << endl;
}
// TODO: this should be a useful option
//else if (strcmp(argv[i],"--ZipFiles") == 0) {
// zipFiles = true;
//}
// if an source phrase is paired with two target phrases, then count(t|s) = 0.5
else if (strcmp(argv[i],"--NoFractionalCounting") == 0) {
options.fractionalCounting = false;
} else if (strcmp(argv[i],"--PCFG") == 0) {
options.pcfgScore = true;
} else if (strcmp(argv[i],"--UnpairedExtractFormat") == 0) {
options.unpairedExtractFormat = true;
} else if (strcmp(argv[i],"--ConditionOnTargetLHS") == 0) {
options.conditionOnTargetLhs = true;
} else if (strcmp(argv[i],"--FlexibilityScore") == 0) {
options.flexScoreFlag = true;
} else if (strcmp(argv[i],"-threads") == 0 ||
strcmp(argv[i],"--threads") == 0 ||
strcmp(argv[i],"--Threads") == 0) {
#ifdef WITH_THREADS
thread_count = atoi(argv[++i]);
#else
cerr << "thread support not compiled in." << '\n';
exit(1);
#endif
} else if (strcmp(argv[i], "--SentenceOffset") == 0) {
if (i+1 >= argc || argv[i+1][0] < '0' || argv[i+1][0] > '9') {
cerr << "extract: syntax error, used switch --SentenceOffset without a number" << endl;
exit(1);
}
sentenceOffset = atoi(argv[++i]);
} else if (strcmp(argv[i],"--BoundaryRules") == 0) {
options.boundaryRules = true;
} else {
cerr << "extract: syntax error, unknown option '" << string(argv[i]) << "'\n";
exit(1);
}
}
cerr << "extracting hierarchical rules" << endl;
// open input files
Moses::InputFileStream tFile(fileNameT);
Moses::InputFileStream sFile(fileNameS);
Moses::InputFileStream aFile(fileNameA);
istream *tFileP = &tFile;
istream *sFileP = &sFile;
istream *aFileP = &aFile;
// open output files
string fileNameExtractInv = fileNameExtract + ".inv" + (options.gzOutput?".gz":"");
Moses::OutputFileStream extractFile;
Moses::OutputFileStream extractFileInv;
Moses::OutputFileStream extractFileContext;
Moses::OutputFileStream extractFileContextInv;
extractFile.Open((fileNameExtract + (options.gzOutput?".gz":"")).c_str());
if (!options.onlyDirectFlag)
extractFileInv.Open(fileNameExtractInv.c_str());
if (options.flexScoreFlag) {
string fileNameExtractContext = fileNameExtract + ".context" + (options.gzOutput?".gz":"");
extractFileContext.Open(fileNameExtractContext.c_str());
if (!options.onlyDirectFlag) {
string fileNameExtractContextInv = fileNameExtract + ".context.inv" + (options.gzOutput?".gz":"");
extractFileContextInv.Open(fileNameExtractContextInv.c_str());
}
}
// stats on labels for glue grammar and unknown word label probabilities
set< string > targetLabelCollection, sourceLabelCollection;
map< string, int > targetTopLabelCollection, sourceTopLabelCollection;
// loop through all sentence pairs
size_t i=sentenceOffset;
string targetString, sourceString, alignmentString;
while(getline(*tFileP, targetString)) {
i++;
getline(*sFileP, sourceString);
getline(*aFileP, alignmentString);
if (i%1000 == 0) cerr << i << " " << flush;
SentenceAlignmentWithSyntax sentence
(targetLabelCollection, sourceLabelCollection,
targetTopLabelCollection, sourceTopLabelCollection, options);
//az: output src, tgt, and alingment line
if (options.onlyOutputSpanInfo) {
cout << "LOG: SRC: " << sourceString << endl;
cout << "LOG: TGT: " << targetString << endl;
cout << "LOG: ALT: " << alignmentString << endl;
cout << "LOG: PHRASES_BEGIN:" << endl;
}
if (sentence.create(targetString.c_str(), sourceString.c_str(), alignmentString.c_str(),"", i, options.boundaryRules)) {
if (options.unknownWordLabelFlag) {
collectWordLabelCounts(sentence);
}
ExtractTask *task = new ExtractTask(sentence, options, extractFile, extractFileInv, extractFileContext, extractFileContextInv);
task->Run();
delete task;
}
if (options.onlyOutputSpanInfo) cout << "LOG: PHRASES_END:" << endl; //az: mark end of phrases
}
tFile.Close();
sFile.Close();
aFile.Close();
// only close if we actually opened it
if (!options.onlyOutputSpanInfo) {
extractFile.Close();
if (!options.onlyDirectFlag) extractFileInv.Close();
}
if (options.flexScoreFlag) {
extractFileContext.Close();
if (!options.onlyDirectFlag) extractFileContextInv.Close();
}
if (options.glueGrammarFlag)
writeGlueGrammar(fileNameGlueGrammar, options, targetLabelCollection, targetTopLabelCollection);
if (options.unknownWordLabelFlag)
writeUnknownWordLabel(fileNameUnknownWordLabel);
}
void ExtractTask::Run()
{
extractRules();
consolidateRules();
writeRulesToFile();
m_extractedRules.clear();
}
void ExtractTask::extractRules()
{
int countT = m_sentence.target.size();
int countS = m_sentence.source.size();
// phrase repository for creating hiero phrases
RuleExist ruleExist(countT);
// check alignments for target phrase startT...endT
for(int lengthT=1;
lengthT <= m_options.maxSpan && lengthT <= countT;
lengthT++) {
for(int startT=0; startT < countT-(lengthT-1); startT++) {
// that's nice to have
int endT = startT + lengthT - 1;
// if there is target side syntax, there has to be a node
if (m_options.targetSyntax && !m_sentence.targetTree.HasNode(startT,endT))
continue;
// find find aligned source words
// first: find minimum and maximum source word
int minS = std::numeric_limits<int>::max();
int maxS = -1;
vector< int > usedS = m_sentence.alignedCountS;
for(int ti=startT; ti<=endT; ti++) {
for(unsigned int i=0; i<m_sentence.alignedToT[ti].size(); i++) {
int si = m_sentence.alignedToT[ti][i];
if (si<minS) {
minS = si;
}
if (si>maxS) {
maxS = si;
}
usedS[ si ]--;
}
}
// unaligned phrases are not allowed
if( maxS == -1 )
continue;
// source phrase has to be within limits
if( maxS-minS >= m_options.maxSpan )
continue;
// check if source words are aligned to out of bound target words
bool out_of_bounds = false;
for(int si=minS; si<=maxS && !out_of_bounds; si++)
if (usedS[si]>0) {
out_of_bounds = true;
}
// if out of bound, you gotta go
if (out_of_bounds)
continue;
// done with all the checks, lets go over all consistent phrase pairs
// start point of source phrase may retreat over unaligned
for(int startS=minS;
(startS>=0 &&
startS>maxS - m_options.maxSpan && // within length limit
(startS==minS || m_sentence.alignedCountS[startS]==0)); // unaligned
startS--) {
// end point of source phrase may advance over unaligned
for(int endS=maxS;
(endS<countS && endS<startS + m_options.maxSpan && // within length limit
(endS==maxS || m_sentence.alignedCountS[endS]==0)); // unaligned
endS++) {
// if there is source side syntax, there has to be a node
if (m_options.sourceSyntax && !m_sentence.sourceTree.HasNode(startS,endS))
continue;
// TODO: loop over all source and target syntax labels
// if within length limits, add as fully-lexical phrase pair
if (endT-startT < m_options.maxSymbolsTarget && endS-startS < m_options.maxSymbolsSource) {
addRule(startT,endT,startS,endS, countS, ruleExist);
}
// take note that this is a valid phrase alignment
ruleExist.Add(startT, endT, startS, endS);
// extract hierarchical rules
// are rules not allowed to start non-terminals?
int initStartT = m_options.nonTermFirstWord ? startT : startT + 1;
HoleCollection holeColl(startS, endS); // empty hole collection
addHieroRule(startT, endT, startS, endS,
ruleExist, holeColl, 0, initStartT,
endT-startT+1, endS-startS+1);
}
}
}
}
}
void ExtractTask::preprocessSourceHieroPhrase( int startT, int endT, int startS, int endS
, WordIndex &indexS, HoleCollection &holeColl, const LabelIndex &labelIndex)
{
vector<Hole*>::iterator iterHoleList = holeColl.GetSortedSourceHoles().begin();
assert(iterHoleList != holeColl.GetSortedSourceHoles().end());
int outPos = 0;
int holeCount = 0;
int holeTotal = holeColl.GetHoles().size();
for(int currPos = startS; currPos <= endS; currPos++) {
bool isHole = false;
if (iterHoleList != holeColl.GetSortedSourceHoles().end()) {
const Hole &hole = **iterHoleList;
isHole = hole.GetStart(0) == currPos;
}
if (isHole) {
Hole &hole = **iterHoleList;
int labelI = labelIndex[ 2+holeCount+holeTotal ];
string label = m_options.sourceSyntax ?
m_sentence.sourceTree.GetNodes(currPos,hole.GetEnd(0))[ labelI ]->GetLabel() : "X";
hole.SetLabel(label, 0);
currPos = hole.GetEnd(0);
hole.SetPos(outPos, 0);
++iterHoleList;
++holeCount;
} else {
indexS[currPos] = outPos;
}
outPos++;
}
assert(iterHoleList == holeColl.GetSortedSourceHoles().end());
}
string ExtractTask::saveTargetHieroPhrase( int startT, int endT, int startS, int endS
, WordIndex &indexT, HoleCollection &holeColl, const LabelIndex &labelIndex, double &logPCFGScore
, int countS)
{
HoleList::iterator iterHoleList = holeColl.GetHoles().begin();
assert(iterHoleList != holeColl.GetHoles().end());
string out = "";
int outPos = 0;
int holeCount = 0;
for(int currPos = startT; currPos <= endT; currPos++) {
bool isHole = false;
if (iterHoleList != holeColl.GetHoles().end()) {
const Hole &hole = *iterHoleList;
isHole = hole.GetStart(1) == currPos;
}
if (isHole) {
Hole &hole = *iterHoleList;
const string &sourceLabel = hole.GetLabel(0);
assert(sourceLabel != "");
int labelI = labelIndex[ 2+holeCount ];
string targetLabel;
if (m_options.targetSyntax) {
targetLabel = m_sentence.targetTree.GetNodes(currPos,hole.GetEnd(1))[labelI]->GetLabel();
} else if (m_options.boundaryRules && (startS == 0 || endS == countS - 1)) {
targetLabel = "S";
} else {
targetLabel = "X";
}
hole.SetLabel(targetLabel, 1);
if (m_options.unpairedExtractFormat) {
out += "[" + targetLabel + "] ";
} else {
out += "[" + sourceLabel + "][" + targetLabel + "] ";
}
if (m_options.pcfgScore) {
double score = m_sentence.targetTree.GetNodes(currPos,hole.GetEnd(1))[labelI]->GetPcfgScore();
logPCFGScore -= score;
}
currPos = hole.GetEnd(1);
hole.SetPos(outPos, 1);
++iterHoleList;
holeCount++;
} else {
indexT[currPos] = outPos;
out += m_sentence.target[currPos] + " ";
}
outPos++;
}
assert(iterHoleList == holeColl.GetHoles().end());
return out.erase(out.size()-1);
}
string ExtractTask::saveSourceHieroPhrase( int startT, int endT, int startS, int endS
, HoleCollection &holeColl, const LabelIndex &labelIndex)
{
vector<Hole*>::iterator iterHoleList = holeColl.GetSortedSourceHoles().begin();
assert(iterHoleList != holeColl.GetSortedSourceHoles().end());
string out = "";
int outPos = 0;
int holeCount = 0;
for(int currPos = startS; currPos <= endS; currPos++) {
bool isHole = false;
if (iterHoleList != holeColl.GetSortedSourceHoles().end()) {
const Hole &hole = **iterHoleList;
isHole = hole.GetStart(0) == currPos;
}
if (isHole) {
Hole &hole = **iterHoleList;
const string &targetLabel = hole.GetLabel(1);
assert(targetLabel != "");
const string &sourceLabel = hole.GetLabel(0);
if (m_options.unpairedExtractFormat) {
out += "[" + sourceLabel + "] ";
} else {
out += "[" + sourceLabel + "][" + targetLabel + "] ";
}
currPos = hole.GetEnd(0);
hole.SetPos(outPos, 0);
++iterHoleList;
++holeCount;
} else {
out += m_sentence.source[currPos] + " ";
}
outPos++;
}
assert(iterHoleList == holeColl.GetSortedSourceHoles().end());
return out.erase(out.size()-1);
}
void ExtractTask::saveHieroAlignment( int startT, int endT, int startS, int endS
, const WordIndex &indexS, const WordIndex &indexT, HoleCollection &holeColl, ExtractedRule &rule)
{
// print alignment of words
for(int ti=startT; ti<=endT; ti++) {
WordIndex::const_iterator p = indexT.find(ti);
if (p != indexT.end()) { // does word still exist?
for(unsigned int i=0; i<m_sentence.alignedToT[ti].size(); i++) {
int si = m_sentence.alignedToT[ti][i];
std::string sourceSymbolIndex = IntToString(indexS.find(si)->second);
std::string targetSymbolIndex = IntToString(p->second);
rule.alignment += sourceSymbolIndex + "-" + targetSymbolIndex + " ";
if (! m_options.onlyDirectFlag)
rule.alignmentInv += targetSymbolIndex + "-" + sourceSymbolIndex + " ";
}
}
}
// print alignment of non terminals
HoleList::const_iterator iterHole;
for (iterHole = holeColl.GetHoles().begin(); iterHole != holeColl.GetHoles().end(); ++iterHole) {
const Hole &hole = *iterHole;
std::string sourceSymbolIndex = IntToString(hole.GetPos(0));
std::string targetSymbolIndex = IntToString(hole.GetPos(1));
rule.alignment += sourceSymbolIndex + "-" + targetSymbolIndex + " ";
if (!m_options.onlyDirectFlag)
rule.alignmentInv += targetSymbolIndex + "-" + sourceSymbolIndex + " ";
}
rule.alignment.erase(rule.alignment.size()-1);
if (!m_options.onlyDirectFlag) {
rule.alignmentInv.erase(rule.alignmentInv.size()-1);
}
}
void ExtractTask::saveHieroPhrase( int startT, int endT, int startS, int endS
, HoleCollection &holeColl, LabelIndex &labelIndex, int countS)
{
WordIndex indexS, indexT; // to keep track of word positions in rule
ExtractedRule rule( startT, endT, startS, endS );
// phrase labels
string targetLabel;
if (m_options.targetSyntax) {
targetLabel = m_sentence.targetTree.GetNodes(startT,endT)[labelIndex[0] ]->GetLabel();
} else if (m_options.boundaryRules && (startS == 0 || endS == countS - 1)) {
targetLabel = "S";
} else {
targetLabel = "X";
}
string sourceLabel = m_options.sourceSyntax ?
m_sentence.sourceTree.GetNodes(startS,endS)[ labelIndex[1] ]->GetLabel() : "X";
// create non-terms on the source side
preprocessSourceHieroPhrase(startT, endT, startS, endS, indexS, holeColl, labelIndex);
// target
if (m_options.pcfgScore) {
double logPCFGScore = m_sentence.targetTree.GetNodes(startT,endT)[labelIndex[0]]->GetPcfgScore();
rule.target = saveTargetHieroPhrase(startT, endT, startS, endS, indexT, holeColl, labelIndex, logPCFGScore, countS)
+ " [" + targetLabel + "]";
rule.pcfgScore = std::exp(logPCFGScore);
} else {
double logPCFGScore = 0.0f;
rule.target = saveTargetHieroPhrase(startT, endT, startS, endS, indexT, holeColl, labelIndex, logPCFGScore, countS)
+ " [" + targetLabel + "]";
}
// source
rule.source = saveSourceHieroPhrase(startT, endT, startS, endS, holeColl, labelIndex);
if (m_options.conditionOnTargetLhs) {
rule.source += " [" + targetLabel + "]";
} else {
rule.source += " [" + sourceLabel + "]";
}
// alignment
saveHieroAlignment(startT, endT, startS, endS, indexS, indexT, holeColl, rule);
// context (words to left and right)
if (m_options.flexScoreFlag) {
rule.sourceContextLeft = startS == 0 ? "<s>" : m_sentence.source[startS-1];
rule.sourceContextRight = endS+1 == m_sentence.source.size() ? "<s>" : m_sentence.source[endS+1];
rule.targetContextLeft = startT == 0 ? "<s>" : m_sentence.target[startT-1];
rule.targetContextRight = endT+1 == m_sentence.target.size() ? "<s>" : m_sentence.target[endT+1];
rule.sourceHoleString = "";
rule.targetHoleString = "";
HoleList::const_iterator iterHole;
for (iterHole = holeColl.GetHoles().begin(); iterHole != holeColl.GetHoles().end(); ++iterHole) {
const Hole &hole = *iterHole;
rule.sourceHoleString += hole.GetLabel(0) + ": ";
// rule starts with nonterminal; end of NT is considered left context
if (hole.GetStart(0) == startS) {
rule.sourceContextLeft = m_sentence.source[hole.GetEnd(0)];
}
// rule ends with nonterminal; start of NT is considered right context
else if (hole.GetEnd(0) == endS) {
rule.sourceContextRight = m_sentence.source[hole.GetStart(0)];
}
if (hole.GetStart(1) == startT) {
rule.targetContextLeft = m_sentence.target[hole.GetEnd(1)];
} else if (hole.GetEnd(1) == endT) {
rule.targetContextRight = m_sentence.target[hole.GetStart(1)];
}
for (int i = hole.GetStart(0); i <= hole.GetEnd(0); ++i) {
rule.sourceHoleString += m_sentence.source[i] + " ";
}
rule.targetHoleString += hole.GetLabel(1) + ": ";
for (int i = hole.GetStart(1); i <= hole.GetEnd(1); ++i) {
rule.targetHoleString += m_sentence.target[i] + " ";
}
}
}
addRuleToCollection( rule );
}
void ExtractTask::saveAllHieroPhrases( int startT, int endT, int startS, int endS, HoleCollection &holeColl, int countS)
{
LabelIndex labelIndex,labelCount;
// number of target head labels
int numLabels = m_options.targetSyntax ? m_sentence.targetTree.GetNodes(startT,endT).size() : 1;
labelCount.push_back(numLabels);
labelIndex.push_back(0);
// number of source head labels
numLabels = m_options.sourceSyntax ? m_sentence.sourceTree.GetNodes(startS,endS).size() : 1;
labelCount.push_back(numLabels);
labelIndex.push_back(0);
// number of target hole labels
for( HoleList::const_iterator hole = holeColl.GetHoles().begin();
hole != holeColl.GetHoles().end(); hole++ ) {
int numLabels = m_options.targetSyntax ? m_sentence.targetTree.GetNodes(hole->GetStart(1),hole->GetEnd(1)).size() : 1 ;
labelCount.push_back(numLabels);
labelIndex.push_back(0);
}
// number of source hole labels
holeColl.SortSourceHoles();
for( vector<Hole*>::iterator i = holeColl.GetSortedSourceHoles().begin();
i != holeColl.GetSortedSourceHoles().end(); i++ ) {
const Hole &hole = **i;
int numLabels = m_options.sourceSyntax ? m_sentence.sourceTree.GetNodes(hole.GetStart(0),hole.GetEnd(0)).size() : 1 ;
labelCount.push_back(numLabels);
labelIndex.push_back(0);
}
// loop through the holes
bool done = false;
while(!done) {
saveHieroPhrase( startT, endT, startS, endS, holeColl, labelIndex, countS );
for(unsigned int i=0; i<labelIndex.size(); i++) {
labelIndex[i]++;
if(labelIndex[i] == labelCount[i]) {
labelIndex[i] = 0;
if (i == labelIndex.size()-1)
done = true;
} else {
break;
}
}
}
}
// this function is called recursively
// it pokes a new hole into the phrase pair, and then calls itself for more holes
void ExtractTask::addHieroRule( int startT, int endT, int startS, int endS
, RuleExist &ruleExist, HoleCollection &holeColl
, int numHoles, int initStartT, int wordCountT, int wordCountS)
{
// done, if already the maximum number of non-terminals in phrase pair
if (numHoles >= m_options.maxNonTerm)
return;
// find a hole...
for (int startHoleT = initStartT; startHoleT <= endT; ++startHoleT) {
for (int endHoleT = startHoleT+(m_options.minHoleTarget-1); endHoleT <= endT; ++endHoleT) {
// if last non-terminal, enforce word count limit
if (numHoles == m_options.maxNonTerm-1 && wordCountT - (endHoleT-startT+1) + (numHoles+1) > m_options.maxSymbolsTarget)
continue;
// determine the number of remaining target words
const int newWordCountT = wordCountT - (endHoleT-startHoleT+1);
// always enforce min word count limit
if (newWordCountT < m_options.minWords)
continue;
// except the whole span
if (startHoleT == startT && endHoleT == endT)
continue;
// does a phrase cover this target span?
// if it does, then there should be a list of mapped source phrases
// (multiple possible due to unaligned words)
const HoleList &sourceHoles = ruleExist.GetSourceHoles(startHoleT, endHoleT);
// loop over sub phrase pairs
HoleList::const_iterator iterSourceHoles;
for (iterSourceHoles = sourceHoles.begin(); iterSourceHoles != sourceHoles.end(); ++iterSourceHoles) {
const Hole &sourceHole = *iterSourceHoles;
const int sourceHoleSize = sourceHole.GetEnd(0)-sourceHole.GetStart(0)+1;
// enforce minimum hole size
if (sourceHoleSize < m_options.minHoleSource)
continue;
// determine the number of remaining source words
const int newWordCountS = wordCountS - sourceHoleSize;
// if last non-terminal, enforce word count limit
if (numHoles == m_options.maxNonTerm-1 && newWordCountS + (numHoles+1) > m_options.maxSymbolsSource)
continue;
// enforce min word count limit
if (newWordCountS < m_options.minWords)
continue;
// hole must be subphrase of the source phrase
// (may be violated if subphrase contains additional unaligned source word)
if (startS > sourceHole.GetStart(0) || endS < sourceHole.GetEnd(0))
continue;
// make sure target side does not overlap with another hole
if (holeColl.OverlapSource(sourceHole))
continue;
// if consecutive non-terminals are not allowed, also check for source
if (!m_options.nonTermConsecSource && holeColl.ConsecSource(sourceHole) )
continue;
// check that rule scope would not exceed limit if sourceHole
// were added
if (holeColl.Scope(sourceHole) > m_options.maxScope)
continue;
// require that at least one aligned word is left (unless there are no words at all)
if (m_options.requireAlignedWord && (newWordCountS > 0 || newWordCountT > 0)) {
HoleList::const_iterator iterHoleList = holeColl.GetHoles().begin();
bool foundAlignedWord = false;
// loop through all word positions
for(int pos = startT; pos <= endT && !foundAlignedWord; pos++) {
// new hole? moving on...
if (pos == startHoleT) {
pos = endHoleT;
}
// covered by hole? moving on...
else if (iterHoleList != holeColl.GetHoles().end() && iterHoleList->GetStart(1) == pos) {
pos = iterHoleList->GetEnd(1);
++iterHoleList;
}
// covered by word? check if it is aligned
else {
if (m_sentence.alignedToT[pos].size() > 0)
foundAlignedWord = true;
}
}
if (!foundAlignedWord)
continue;
}
// update list of holes in this phrase pair
holeColl.Add(startHoleT, endHoleT, sourceHole.GetStart(0), sourceHole.GetEnd(0));
// now some checks that disallow this phrase pair, but not further recursion
bool allowablePhrase = true;
// maximum words count violation?
if (newWordCountS + (numHoles+1) > m_options.maxSymbolsSource)
allowablePhrase = false;
if (newWordCountT + (numHoles+1) > m_options.maxSymbolsTarget)
allowablePhrase = false;
// passed all checks...
if (allowablePhrase)
saveAllHieroPhrases(startT, endT, startS, endS, holeColl, wordCountS);
// recursively search for next hole
int nextInitStartT = m_options.nonTermConsecTarget ? endHoleT + 1 : endHoleT + 2;
addHieroRule(startT, endT, startS, endS
, ruleExist, holeColl, numHoles + 1, nextInitStartT
, newWordCountT, newWordCountS);
holeColl.RemoveLast();
}
}
}
}
void ExtractTask::addRule( int startT, int endT, int startS, int endS, int countS, RuleExist &ruleExist)
{
// contains only <s> or </s>. Don't output
if (m_options.boundaryRules
&& ( (startS == 0 && endS == 0)
|| (startS == countS-1 && endS == countS-1))) {
return;
}
if (m_options.onlyOutputSpanInfo) {
cout << startS << " " << endS << " " << startT << " " << endT << endl;
return;
}
ExtractedRule rule(startT, endT, startS, endS);
// phrase labels
string targetLabel,sourceLabel;
if (m_options.targetSyntax && m_options.conditionOnTargetLhs) {
sourceLabel = targetLabel = m_sentence.targetTree.GetNodes(startT,endT)[0]->GetLabel();
} else {
sourceLabel = m_options.sourceSyntax ?
m_sentence.sourceTree.GetNodes(startS,endS)[0]->GetLabel() : "X";
if (m_options.targetSyntax) {
targetLabel = m_sentence.targetTree.GetNodes(startT,endT)[0]->GetLabel();
} else if (m_options.boundaryRules && (startS == 0 || endS == countS - 1)) {
targetLabel = "S";
} else {
targetLabel = "X";
}
}
// source
rule.source = "";
for(int si=startS; si<=endS; si++)
rule.source += m_sentence.source[si] + " ";
rule.source += "[" + sourceLabel + "]";
// target
rule.target = "";
for(int ti=startT; ti<=endT; ti++)
rule.target += m_sentence.target[ti] + " ";
rule.target += "[" + targetLabel + "]";
if (m_options.pcfgScore) {
double logPCFGScore = m_sentence.targetTree.GetNodes(startT,endT)[0]->GetPcfgScore();
rule.pcfgScore = std::exp(logPCFGScore);
}
// alignment
for(int ti=startT; ti<=endT; ti++) {
for(unsigned int i=0; i<m_sentence.alignedToT[ti].size(); i++) {
int si = m_sentence.alignedToT[ti][i];
std::string sourceSymbolIndex = IntToString(si-startS);
std::string targetSymbolIndex = IntToString(ti-startT);
rule.alignment += sourceSymbolIndex + "-" + targetSymbolIndex + " ";
if (!m_options.onlyDirectFlag)
rule.alignmentInv += targetSymbolIndex + "-" + sourceSymbolIndex + " ";
}
}
// context (words to left and right)
if (m_options.flexScoreFlag) {
rule.sourceContextLeft = startS == 0 ? "<s>" : m_sentence.source[startS-1];
rule.sourceContextRight = endS+1 == m_sentence.source.size() ? "<s>" : m_sentence.source[endS+1];
rule.targetContextLeft = startT == 0 ? "<s>" : m_sentence.target[startT-1];
rule.targetContextRight = endT+1 == m_sentence.target.size() ? "<s>" : m_sentence.target[endT+1];
}
rule.alignment.erase(rule.alignment.size()-1);
if (!m_options.onlyDirectFlag)
rule.alignmentInv.erase(rule.alignmentInv.size()-1);
addRuleToCollection( rule );
}
void ExtractTask::addRuleToCollection( ExtractedRule &newRule )
{
// no double-counting of identical rules from overlapping spans
if (!m_options.duplicateRules) {
vector<ExtractedRule>::const_iterator rule;
for(rule = m_extractedRules.begin(); rule != m_extractedRules.end(); rule++ ) {
if (rule->source.compare( newRule.source ) == 0 &&
rule->target.compare( newRule.target ) == 0 &&
!(rule->endT < newRule.startT || rule->startT > newRule.endT)) { // overlapping
return;
}
}
}
m_extractedRules.push_back( newRule );
}
void ExtractTask::consolidateRules()
{
typedef vector<ExtractedRule>::iterator R;
map<int, map<int, map<int, map<int,int> > > > spanCount;
// compute number of rules per span
if (m_options.fractionalCounting) {
for(R rule = m_extractedRules.begin(); rule != m_extractedRules.end(); rule++ ) {
spanCount[ rule->startT ][ rule->endT ][ rule->startS ][ rule->endS ]++;
}
}
// compute fractional counts
for(R rule = m_extractedRules.begin(); rule != m_extractedRules.end(); rule++ ) {
rule->count = 1.0/(float) (m_options.fractionalCounting ? spanCount[ rule->startT ][ rule->endT ][ rule->startS ][ rule->endS ] : 1.0 );
}
// consolidate counts
map<std::string, map< std::string, map< std::string, float> > > consolidatedCount;
for(R rule = m_extractedRules.begin(); rule != m_extractedRules.end(); rule++ ) {
consolidatedCount[ rule->source ][ rule->target][ rule->alignment ] += rule->count;
}
for(R rule = m_extractedRules.begin(); rule != m_extractedRules.end(); rule++ ) {
float count = consolidatedCount[ rule->source ][ rule->target][ rule->alignment ];
rule->count = count;
consolidatedCount[ rule->source ][ rule->target][ rule->alignment ] = 0;
}
}
void ExtractTask::writeRulesToFile()
{
vector<ExtractedRule>::const_iterator rule;
ostringstream out;
ostringstream outInv;
ostringstream outContext;
ostringstream outContextInv;
for(rule = m_extractedRules.begin(); rule != m_extractedRules.end(); rule++ ) {
if (rule->count == 0)
continue;
out << rule->source << " ||| "
<< rule->target << " ||| "
<< rule->alignment << " ||| "
<< rule->count << " ||| ";
if (m_options.pcfgScore) {
out << " ||| " << rule->pcfgScore;
}
out << "\n";
if (!m_options.onlyDirectFlag) {
outInv << rule->target << " ||| "
<< rule->source << " ||| "
<< rule->alignmentInv << " ||| "
<< rule->count << "\n";
}
if (m_options.flexScoreFlag) {
for(int iContext=0; iContext<2; iContext++) {
outContext << rule->source << " ||| "
<< rule->target << " ||| "
<< rule->alignment << " ||| ";
iContext ? outContext << "< " << rule->sourceContextLeft << "\n" : outContext << "> " << rule->sourceContextRight << "\n";
if (!m_options.onlyDirectFlag) {
outContextInv << rule->target << " ||| "
<< rule->source << " ||| "
<< rule->alignmentInv << " ||| ";
iContext ? outContextInv << "< " << rule->targetContextLeft << "\n" : outContextInv << "> " << rule->targetContextRight << "\n";
}
}
if (rule->sourceHoleString != "") {
outContext << rule->source << " ||| "
<< rule->target << " ||| "
<< rule->alignment << " ||| v "
<< rule->sourceHoleString << "\n";
}
if (!m_options.onlyDirectFlag and rule->targetHoleString != "") {
outContextInv << rule->target << " ||| "
<< rule->source << " ||| "
<< rule->alignmentInv << " ||| v "
<< rule->targetHoleString << "\n";
}
}
}
m_extractFile << out.str();
m_extractFileInv << outInv.str();
m_extractFileContext << outContext.str();
m_extractFileContextInv << outContextInv.str();
}
void writeGlueGrammar( const string & fileName, RuleExtractionOptions &options, set< string > &targetLabelCollection, map< string, int > &targetTopLabelCollection )
{
ofstream grammarFile;
grammarFile.open(fileName.c_str());
if (!options.targetSyntax) {
grammarFile << "<s> [X] ||| <s> [S] ||| 1 ||| 0-0 ||| 0" << endl
<< "[X][S] </s> [X] ||| [X][S] </s> [S] ||| 1 ||| 0-0 1-1 ||| 0" << endl
<< "[X][S] [X][X] [X] ||| [X][S] [X][X] [S] ||| 2.718 ||| 0-0 1-1 ||| 0" << endl;
} else {
// chose a top label that is not already a label
string topLabel = "QQQQQQ";
for( unsigned int i=1; i<=topLabel.length(); i++) {
if(targetLabelCollection.find( topLabel.substr(0,i) ) == targetLabelCollection.end() ) {
topLabel = topLabel.substr(0,i);
break;
}
}
// basic rules
grammarFile << "<s> [X] ||| <s> [" << topLabel << "] ||| 1 ||| 0-0" << endl
<< "[X][" << topLabel << "] </s> [X] ||| [X][" << topLabel << "] </s> [" << topLabel << "] ||| 1 ||| 0-0 1-1" << endl;
// top rules
for( map<string,int>::const_iterator i = targetTopLabelCollection.begin();
i != targetTopLabelCollection.end(); i++ ) {
grammarFile << "<s> [X][" << i->first << "] </s> [X] ||| <s> [X][" << i->first << "] </s> [" << topLabel << "] ||| 1 ||| 0-0 1-1 2-2" << endl;
}
// glue rules
for( set<string>::const_iterator i = targetLabelCollection.begin();
i != targetLabelCollection.end(); i++ ) {
grammarFile << "[X][" << topLabel << "] [X][" << *i << "] [X] ||| [X][" << topLabel << "] [X][" << *i << "] [" << topLabel << "] ||| 2.718 ||| 0-0 1-1" << endl;
}
grammarFile << "[X][" << topLabel << "] [X][X] [X] ||| [X][" << topLabel << "] [X][X] [" << topLabel << "] ||| 2.718 ||| 0-0 1-1 " << endl; // glue rule for unknown word...
}
grammarFile.close();
}
// collect counts for labels for each word
// ( labels of singleton words are used to estimate
// distribution oflabels for unknown words )
map<string,int> wordCount;
map<string,string> wordLabel;
void collectWordLabelCounts( SentenceAlignmentWithSyntax &sentence )
{
int countT = sentence.target.size();
for(int ti=0; ti < countT; ti++) {
string &word = sentence.target[ ti ];
const vector< SyntaxNode* >& labels = sentence.targetTree.GetNodes(ti,ti);
if (labels.size() > 0) {
wordCount[ word ]++;
wordLabel[ word ] = labels[0]->GetLabel();
}
}
}
void writeUnknownWordLabel(const string & fileName)
{
ofstream outFile;
outFile.open(fileName.c_str());
typedef map<string,int>::const_iterator I;
map<string,int> count;
int total = 0;
for(I word = wordCount.begin(); word != wordCount.end(); word++) {
// only consider singletons
if (word->second == 1) {
count[ wordLabel[ word->first ] ]++;
total++;
}
}
for(I pos = count.begin(); pos != count.end(); pos++) {
double ratio = ((double) pos->second / (double) total);
if (ratio > 0.03)
outFile << pos->first << " " << ratio << endl;
}
outFile.close();
}
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