Likelihood.hpp

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#pragma once
 
#include "Data.hpp"

class Likelihood {
protected:
  const Data &data; 
 
public:
  Likelihood(const Data &data) : data(data) {}

 
  virtual double cluster_loglikelihood(int cluster_index) const = 0;

 
  virtual double cluster_loglikelihood(
      int cluster_index,
      const Eigen::Ref<const Eigen::VectorXi> &cls_ass_k) const = 0;

  virtual double clusters_loglikelihood(int c1, int c2) const {
    return cluster_loglikelihood(c1) + cluster_loglikelihood(c2);
  }

 
  virtual double point_loglikelihood_cond(int point_index,
                                          int cluster_index) const = 0;
 
  virtual ~Likelihood() = default;
};