A short implementation of the chi-squared distance between sets
of histograms. This is a very useful distance e.g. in the area of
object recognition.
The code uses compiler intrinsics (on x86 and x86-64) and OpenMP
parallelism if supported, making it -to my knowledge- the fastest
implementation that is freely available.
See LICENSE.txt for the licensing terms.
(C) 2007-2008, Christoph Lampert <christoph.lampert@gmail.com>
Changelog:
2008/07/21: bug fixed in SHUFFLE for double entries.
Thanks for Sebastian Nowozin for spotting this.
2009/02/15: bug fixed in symmetric chi2 calculation
and python wrapper. Thanks to Nicolas Pinto
for spotting this.