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#ifndef _IS_SOURCE_TARGET_SINGLETON_H_
#define _IS_SOURCE_TARGET_SINGLETON_H_
#include "feature.h"
namespace extractor {
namespace features {
/**
* Boolean feature checking if the phrase pair occurs only once in the data.
*/
class IsSourceTargetSingleton : public Feature {
public:
double Score(const FeatureContext& context) const;
string GetName() const;
};
} // namespace features
} // namespace extractor
#endif
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