kernel-function.H

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#ifndef RERANKER_KERNEL_FUNCTION_H_
#define RERANKER_KERNEL_FUNCTION_H_

#include "feature-vector.H"

namespace reranker {

class KernelFunction {
 public:
  virtual ~KernelFunction() { }
  virtual double Apply(const FeatureVector<int,double> &fv1,
                       const FeatureVector<int,double> &fv2) {
    return Apply(fv1, -1, fv2, -1);
  }

  virtual double Apply(const FeatureVector<int,double> &fv1, int index1,
                       const FeatureVector<int,double> &fv2, int index2)
      const = 0;
};

}  // namespace reranker

#endif