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#include "SemposScorer.h"
#include <algorithm>
#include <vector>
#include <stdexcept>
#include <fstream>
#include "Util.h"
#include "SemposOverlapping.h"
using namespace std;
namespace MosesTuning
{
SemposScorer::SemposScorer(const string& config)
: StatisticsBasedScorer("SEMPOS", config),
m_ovr(SemposOverlappingFactory::GetOverlapping(getConfig("overlapping", "cap-micro"),this)),
m_enable_debug(false)
{
const string& debugSwitch = getConfig("debug", "0");
if (debugSwitch == "1") m_enable_debug = true;
m_semposMap.clear();
string weightsfile = getConfig("weightsfile", "");
if (weightsfile != "") {
loadWeights(weightsfile);
}
}
SemposScorer::~SemposScorer() {}
void SemposScorer::setReferenceFiles(const vector<string>& referenceFiles)
{
//make sure reference data is clear
m_ref_sentences.clear();
//load reference data
for (size_t rid = 0; rid < referenceFiles.size(); ++rid) {
ifstream refin(referenceFiles[rid].c_str());
if (!refin) {
throw runtime_error("Unable to open: " + referenceFiles[rid]);
}
m_ref_sentences.push_back(vector<sentence_t>());
string line;
while (getline(refin,line)) {
line = preprocessSentence(line);
str_sentence_t sentence;
splitSentence(line, sentence);
sentence_t encodedSentence;
encodeSentence(sentence, encodedSentence);
m_ref_sentences[rid].push_back(encodedSentence);
}
}
}
void SemposScorer::prepareStats(size_t sid, const string& text, ScoreStats& entry)
{
vector<ScoreStatsType> stats;
const string& sentence = preprocessSentence(text);
str_sentence_t splitCandSentence;
splitSentence(sentence, splitCandSentence);
sentence_t encodedCandSentence;
encodeSentence(splitCandSentence, encodedCandSentence);
if (m_ref_sentences.size() == 1) {
stats = m_ovr->prepareStats(encodedCandSentence, m_ref_sentences[0][sid]);
} else {
float max = -1.0f;
for (size_t rid = 0; rid < m_ref_sentences.size(); ++rid) {
const vector<ScoreStatsType>& tmp = m_ovr->prepareStats(encodedCandSentence, m_ref_sentences[rid][sid]);
if (m_ovr->calculateScore(tmp) > max) {
stats = tmp;
}
}
}
entry.set(stats);
}
void SemposScorer::splitSentence(const string& sentence, str_sentence_t& splitSentence)
{
splitSentence.clear();
vector<string> tokens;
split(sentence, ' ', tokens);
for (vector<string>::iterator it = tokens.begin(); it != tokens.end(); ++it) {
vector<string> factors;
if (it->empty()) continue;
split(*it, '|', factors);
if (factors.size() != 2) throw runtime_error("Sempos scorer accepts two factors (item|class)");
const string& item = factors[0];
const string& klass = factors[1];
splitSentence.push_back(make_pair(item, klass));
}
}
void SemposScorer::encodeSentence(const str_sentence_t& sentence, sentence_t& encodedSentence)
{
for (str_sentence_it it = sentence.begin(); it != sentence.end(); ++it) {
const int tlemma = encodeString(it->first);
const int sempos = encodeSempos(it->second);
if (sempos >= 0) {
encodedSentence.insert(make_pair(tlemma,sempos));
}
}
}
int SemposScorer::encodeString(const string& str)
{
encoding_it encoding = m_stringMap.find(str);
int encoded_str;
if (encoding == m_stringMap.end()) {
encoded_str = static_cast<int>(m_stringMap.size());
m_stringMap[str] = encoded_str;
} else {
encoded_str = encoding->second;
}
return encoded_str;
}
int SemposScorer::encodeSempos(const string& sempos)
{
if (sempos == "-") return -1;
encoding_it it = m_semposMap.find(sempos);
if (it == m_semposMap.end()) {
const int classNumber = static_cast<int>(m_semposMap.size());
if (classNumber == kMaxNOC) {
throw std::runtime_error("Number of classes is greater than kMaxNOC");
}
m_semposMap[sempos] = classNumber;
return classNumber;
} else {
return it->second;
}
}
float SemposScorer::weight(int item) const
{
std::map<int,float>::const_iterator it = weightsMap.find(item);
if (it == weightsMap.end()) {
return 1.0f;
} else {
return it->second;
}
}
void SemposScorer::loadWeights(const string& weightsfile)
{
string line;
ifstream myfile;
myfile.open(weightsfile.c_str(), ifstream::in);
if (myfile.is_open()) {
while ( myfile.good() ) {
getline (myfile,line);
vector<string> fields;
if (line == "") continue;
split(line, '\t', fields);
if (fields.size() != 2) throw std::runtime_error("Bad format of a row in weights file.");
int encoded = encodeString(fields[0]);
float weight = atof(fields[1].c_str());
weightsMap[encoded] = weight;
}
myfile.close();
} else {
cerr << "Unable to open file "<< weightsfile << endl;
exit(1);
}
}
}
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