[mlpack-git] [mlpack] Fix drop out layer (#463)

[stereomatchingkiss]

Maybe we can set scale when the ratio is changed, but current api cannot do that. Something as following

    void SetRatio(double ratioValue)
    {
        ratio = ratioValue;
        scale = 1.0 / (1.0 - ratio);
    }

I think I would setup the value of scale as you suggested and specify the range of the ratio on the comments

    param ratio The ratio of the drop out(ratio > 0 && ratio < 1), by default it is 0.5

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https://github.com/mlpack/mlpack/pull/463#issuecomment-150465372
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