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#include "translation_table.h"
#include <string>
#include <vector>
#include <boost/functional/hash.hpp>
#include "alignment.h"
#include "data_array.h"
using namespace std;
using namespace tr1;
TranslationTable::TranslationTable(shared_ptr<DataArray> source_data_array,
shared_ptr<DataArray> target_data_array,
shared_ptr<Alignment> alignment) :
source_data_array(source_data_array), target_data_array(target_data_array) {
const vector<int>& source_data = source_data_array->GetData();
const vector<int>& target_data = target_data_array->GetData();
unordered_map<int, int> source_links_count;
unordered_map<int, int> target_links_count;
unordered_map<pair<int, int>, int, PairHash > links_count;
for (size_t i = 0; i < source_data_array->GetNumSentences(); ++i) {
const vector<pair<int, int> >& links = alignment->GetLinks(i);
int source_start = source_data_array->GetSentenceStart(i);
int next_source_start = source_data_array->GetSentenceStart(i + 1);
int target_start = target_data_array->GetSentenceStart(i);
int next_target_start = target_data_array->GetSentenceStart(i + 1);
vector<int> source_sentence(source_data.begin() + source_start,
source_data.begin() + next_source_start);
vector<int> target_sentence(target_data.begin() + target_start,
target_data.begin() + next_target_start);
vector<int> source_linked_words(source_sentence.size());
vector<int> target_linked_words(target_sentence.size());
for (pair<int, int> link: links) {
source_linked_words[link.first] = 1;
target_linked_words[link.second] = 1;
int source_word = source_sentence[link.first];
int target_word = target_sentence[link.second];
++source_links_count[source_word];
++target_links_count[target_word];
++links_count[make_pair(source_word, target_word)];
}
// TODO(pauldb): Something seems wrong here. No NULL word?
}
for (pair<pair<int, int>, int> link_count: links_count) {
int source_word = link_count.first.first;
int target_word = link_count.first.second;
double score1 = 1.0 * link_count.second / source_links_count[source_word];
double score2 = 1.0 * link_count.second / target_links_count[target_word];
translation_probabilities[link_count.first] = make_pair(score1, score2);
}
}
double TranslationTable::GetTargetGivenSourceScore(
const string& source_word, const string& target_word) {
if (!source_data_array->HasWord(source_word) ||
!target_data_array->HasWord(target_word)) {
return -1;
}
int source_id = source_data_array->GetWordId(source_word);
int target_id = target_data_array->GetWordId(target_word);
return translation_probabilities[make_pair(source_id, target_id)].first;
}
double TranslationTable::GetSourceGivenTargetScore(
const string& source_word, const string& target_word) {
if (!source_data_array->HasWord(source_word) ||
!target_data_array->HasWord(target_word) == 0) {
return -1;
}
int source_id = source_data_array->GetWordId(source_word);
int target_id = target_data_array->GetWordId(target_word);
return translation_probabilities[make_pair(source_id, target_id)].second;
}
void TranslationTable::WriteBinary(const fs::path& filepath) const {
FILE* file = fopen(filepath.string().c_str(), "w");
int size = translation_probabilities.size();
fwrite(&size, sizeof(int), 1, file);
for (auto entry: translation_probabilities) {
fwrite(&entry.first, sizeof(entry.first), 1, file);
fwrite(&entry.second, sizeof(entry.second), 1, file);
}
}
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