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versions were calling into cuDNN, however, the cuDNN functions for doing this
are horrifically slow, well over 100x slower than they should be, which is
surprising since these functions are so trivial.

little.

NaN is encountered.

in some cases.

Added Travis badge  ![badge](https://travis-ci.org/davisking/dlib.svg?branch=master)

If temp is nonzero but a subnormal then temp2 matrix may contain infinities which may cause temp assignment in line 225 to be a NaN (as a difference of two positive infinities).

user confusion.