binary_log_loss.hpp

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#ifndef __STAN__MATH__FUNCTIONS__BINARY_LOG_LOSS_HPP__
#define __STAN__MATH__FUNCTIONS__BINARY_LOG_LOSS_HPP__

#include <boost/math/tools/promotion.hpp>

namespace stan {
  namespace math {

    template <typename T>
    inline typename boost::math::tools::promote_args<T>::type
    binary_log_loss(const int y, const T y_hat) {
      using std::log;
      return -log(y ? y_hat : (1.0 - y_hat));
    }

  }
}

#endif