sigmoid.h

Go to the documentation of this file.

#include <cmath>

#include "classify/kernel/polynomial.h"
#include "meta.h"

#ifndef META_CLASSIFY_KERNEL_SIGMOID_H_
#define META_CLASSIFY_KERNEL_SIGMOID_H_

namespace meta
{
namespace classify
{
namespace kernel
{

class sigmoid
{
  public:
    sigmoid(double alpha, double c) : alpha_{alpha}, c_{c}
    {
        /* nothing */
    }

    template <class PostingsData>
    double operator()(const PostingsData& first,
                      const PostingsData& second) const;

  private:
    double alpha_;

    double c_;

    polynomial dot_{1, 0.0};
};
}
}
}

#include "classify/kernel/sigmoid.tcc"
#endif