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#ifndef _FEATURE_H_
#define _FEATURE_H_
#include <string>
#include "phrase.h"
using namespace std;
namespace extractor {
namespace features {
/**
* Structure providing context for computing feature scores.
*/
struct FeatureContext {
FeatureContext(const Phrase& source_phrase, const Phrase& target_phrase,
double source_phrase_count, int pair_count, int num_samples) :
source_phrase(source_phrase), target_phrase(target_phrase),
source_phrase_count(source_phrase_count), pair_count(pair_count),
num_samples(num_samples) {}
Phrase source_phrase;
Phrase target_phrase;
double source_phrase_count;
int pair_count;
int num_samples;
};
/**
* Base class for features.
*/
class Feature {
public:
virtual double Score(const FeatureContext& context) const = 0;
virtual string GetName() const = 0;
virtual ~Feature();
static const double MAX_SCORE;
};
} // namespace features
} // namespace extractor
#endif
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