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#ifndef _CSENTROPY_H_
#define _CSENTROPY_H_
#include <vector>
#include "sparse_vector.h"
namespace training {
class CandidateSet;
class CandidateSetEntropy {
public:
explicit CandidateSetEntropy(const CandidateSet& cs) : cands_(cs) {}
// compute the entropy (expected log likelihood) of a CandidateSet
// (optional) the gradient of the entropy with respect to params
double operator()(const std::vector<double>& params,
SparseVector<double>* g = NULL) const;
private:
const CandidateSet& cands_;
};
};
#endif
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