Log loss should be comuted in base e, not 10

[erlendd]

In _evaluate_class the log loss computed uses base 10, it should be base e (natural log).
I.e.:
_loglikelihood -= m_log10(pll) + (1-m)_log10(1-pll);
should be,
_loglikelihood -= m_log(pll) + (1-m)_log(1-pll);

[yunyu-Mr]

Yes, you are right.

_loglikelihood -= m * std::log(pll) + (1-m) * std::log(1-pll);