[mlpack-git] [mlpack/mlpack] only initialize variable once (#614)

[stereomatchingkiss]

Refine of pull request #612 

constexpr make sure the variable can initialize at compile time
static make sure the variable will initialize only once
You can view, comment on, or merge this pull request online at:

  https://github.com/mlpack/mlpack/pull/614

-- Commit Summary --

  * only initialize variable once

-- File Changes --

    M src/mlpack/methods/ann/layer/log_softmax_layer.hpp (10)

-- Patch Links --

https://github.com/mlpack/mlpack/pull/614.patch
https://github.com/mlpack/mlpack/pull/614.diff

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