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#include "SoftMatchingFeature.h"
#include "moses/AlignmentInfo.h"
#include "moses/TargetPhrase.h"
#include "moses/ChartHypothesis.h"
#include "moses/StaticData.h"
#include "moses/InputFileStream.h"
#include "moses/FactorCollection.h"
#include "moses/Util.h"
namespace Moses
{
SoftMatchingFeature::SoftMatchingFeature(const std::string &line)
: StatelessFeatureFunction(0, line)
, m_softMatches(moses_MaxNumNonterminals)
, m_scoreIdentical(true)
{
ReadParameters();
}
void SoftMatchingFeature::SetParameter(const std::string& key, const std::string& value)
{
std::cerr << "setting: " << this->GetScoreProducerDescription() << " - " << key << "\n";
if (key == "tuneable") {
m_tuneable = Scan<bool>(value);
} else if (key == "filterable") { //ignore
} else if (key == "path") {
const std::string filePath = value;
Load(filePath);
} else if (key == "score-identical") {
m_scoreIdentical = Scan<bool>(value);
} else {
UTIL_THROW(util::Exception, "Unknown argument " << key << "=" << value);
}
}
bool SoftMatchingFeature::Load(const std::string& filePath)
{
StaticData &SD = StaticData::InstanceNonConst();
InputFileStream inStream(filePath);
std::string line;
while(getline(inStream, line)) {
std::vector<std::string> tokens = Tokenize(line);
UTIL_THROW_IF2(tokens.size() != 2, "Error: wrong format of SoftMatching file: must have two nonterminals per line");
// no soft matching necessary if LHS and RHS are the same
if (tokens[0] == tokens[1]) {
continue;
}
Word LHS, RHS;
LHS.CreateFromString(Output, SD.options().output.factor_order, tokens[0], true);
RHS.CreateFromString(Output, SD.options().output.factor_order, tokens[1], true);
m_softMatches[RHS[0]->GetId()].push_back(LHS);
GetOrSetFeatureName(RHS, LHS);
}
SD.SetSoftMatches(m_softMatches);
return true;
}
void SoftMatchingFeature::EvaluateWhenApplied(const ChartHypothesis& hypo,
ScoreComponentCollection* accumulator) const
{
const TargetPhrase& target = hypo.GetCurrTargetPhrase();
const AlignmentInfo::NonTermIndexMap &nonTermIndexMap = target.GetAlignNonTerm().GetNonTermIndexMap();
// loop over the rule that is being applied
for (size_t pos = 0; pos < target.GetSize(); ++pos) {
const Word& word = target.GetWord(pos);
// for non-terminals, trigger the feature mapping the LHS of the previous hypo to the RHS of this hypo
if (word.IsNonTerminal()) {
size_t nonTermInd = nonTermIndexMap[pos];
const ChartHypothesis* prevHypo = hypo.GetPrevHypo(nonTermInd);
const Word& prevLHS = prevHypo->GetTargetLHS();
if ( (word != prevLHS) || m_scoreIdentical ) {
const std::string &name = GetOrSetFeatureName(word, prevLHS);
accumulator->PlusEquals(this,name,1);
}
}
}
}
// when loading, or when we notice that non-terminals have been added after loading, we resize vectors
void SoftMatchingFeature::ResizeCache() const
{
FactorCollection& fc = FactorCollection::Instance();
size_t numNonTerminals = fc.GetNumNonTerminals();
m_nameCache.resize(numNonTerminals);
for (size_t i = 0; i < numNonTerminals; i++) {
m_nameCache[i].resize(numNonTerminals);
}
}
const std::string& SoftMatchingFeature::GetOrSetFeatureName(const Word& RHS, const Word& LHS) const
{
try {
#ifdef WITH_THREADS //try read-only lock
boost::shared_lock<boost::shared_mutex> read_lock(m_accessLock);
#endif
const std::string &name = m_nameCache.at(RHS[0]->GetId()).at(LHS[0]->GetId());
if (!name.empty()) {
return name;
}
} catch (const std::out_of_range& oor) {
#ifdef WITH_THREADS //need to resize cache; write lock
boost::unique_lock<boost::shared_mutex> lock(m_accessLock);
#endif
ResizeCache();
}
#ifdef WITH_THREADS //need to update cache; write lock
boost::unique_lock<boost::shared_mutex> lock(m_accessLock);
#endif
std::string &name = m_nameCache[RHS[0]->GetId()][LHS[0]->GetId()];
const std::vector<FactorType> & oFactors
= StaticData::Instance().options().output.factor_order;
std::string LHS_string = LHS.GetString(oFactors, false);
std::string RHS_string = RHS.GetString(oFactors, false);
name = LHS_string + "->" + RHS_string;
return name;
}
}
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