tree 1d280b3ac9eab78543e232bbf33de8418ce5e5d6
parent 6029c07a3ddce313e27d914a9c7dffb53b48b4cc
author Matthias Boehm <mboehm7@gmail.com> 1597496975 +0200
committer Matthias Boehm <mboehm7@gmail.com> 1597497007 +0200

[MINOR] Performance replace operations (w/ pattern, replacement)

As more and more pre-processing techniques use replace operations for
robustness against NaN and other special values, this patch makes a
performance improvement for special cases. So far we always allocated
the output and copied values with on-the-fly replacement of the pattern
and awareness for NaNs. Now, we first probe with (early abort) if the
matrix contains the pattern and only if this is the case allocate and
copy the values; otherwise the we simply return the input.