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#ifndef _TRANSLATION_TABLE_
#define _TRANSLATION_TABLE_
#include <memory>
#include <string>
#include <unordered_map>
#include <boost/filesystem.hpp>
#include <boost/functional/hash.hpp>
using namespace std;
namespace fs = boost::filesystem;
namespace extractor {
typedef boost::hash<pair<int, int>> PairHash;
class Alignment;
class DataArray;
/**
* Bilexical table with conditional probabilities.
*/
class TranslationTable {
public:
TranslationTable(
shared_ptr<DataArray> source_data_array,
shared_ptr<DataArray> target_data_array,
shared_ptr<Alignment> alignment);
virtual ~TranslationTable();
// Returns p(e | f).
virtual double GetTargetGivenSourceScore(const string& source_word,
const string& target_word);
// Returns p(f | e).
virtual double GetSourceGivenTargetScore(const string& source_word,
const string& target_word);
void WriteBinary(const fs::path& filepath) const;
protected:
TranslationTable();
private:
// Increment links count for the given (f, e) word pair.
void IncrementLinksCount(
unordered_map<int, int>& source_links_count,
unordered_map<int, int>& target_links_count,
unordered_map<pair<int, int>, int, PairHash>& links_count,
int source_word_id,
int target_word_id) const;
shared_ptr<DataArray> source_data_array;
shared_ptr<DataArray> target_data_array;
unordered_map<pair<int, int>, pair<double, double>, PairHash>
translation_probabilities;
};
} // namespace extractor
#endif
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