lm_ranker.h

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#ifndef META_LM_RANKER_H_
#define META_LM_RANKER_H_

#include "index/ranker/ranker.h"

namespace meta
{
namespace index
{

class language_model_ranker : public ranker
{
  public:
    const static std::string id;

    double score_one(const score_data& sd) override;

    double initial_score(const score_data& sd) const override;

    virtual double smoothed_prob(const score_data& sd) const = 0;

    virtual double doc_constant(const score_data& sd) const = 0;

    virtual ~language_model_ranker() = default;
};
}
}

#endif