[mlpack-git] [mlpack/mlpack] use constexpr to replace static const (#612)

[Marcus Edel]

I'm not sure I get the intention to prefer constexpr in this case. There is no expression that can be evaluated during compilation using one of the parameter. Also, removing static isn't a good idea, since once the program is compiled, constexpr is no longer relevant and I would prefer to initialize the variable once.

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