LOG_COSH
LOG_COSH()
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Computes the logarithm of the hyperbolic cosine of the prediction error.
``log(cosh(x))`` is approximately equal to ``(x ** 2) / 2`` for small ``x`` and to ``abs(x) - log(2)`` for large ``x``. This means that logcosh works mostly like the mean squared error, but will not be so strongly affected by the occasional wildly incorrect prediction.