Improve performance of RNG sampling routines #613
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This patch improves the speed at which samples are drawn from
gaussian distributions. The improvement is activate for matrices
with more than 2500 components (roughly 32x32x3 and above).
For large matrices (224x224x3 and above) the expected speedup is
up to 3x.
This patch also improves the performance of sampling using
RNG.uniform().
The speedup is activated for matrices with 12500+ components
and is around 2x for large images (224x224x3).