[mlpack-git] [mlpack] Fix bug #358 (CosineTreeTest/CosineNodeCosineSplit test sometimes fails, only on i386) (#581)

[lozhnikov]

If I am not mistaken the `arma::dot` is not precompiled. So it may be calculated differently due to compiler optimizations. For example if you combine summands in the reverse order you may get another result which differs by a calculational inaccuracy.

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