Add Local Contrast Normalization

[cesarsouza]

It would be interesting to add the Local Contrast Normalization as referenced in

Jarrett, Kavukcuoglu, Ranzato and LeCun (2009); What is the Best Multi-Stage Architecture for Object Recognition? Available at http://yann.lecun.com/exdb/publis/pdf/jarrett-iccv-09.pdf

Pinto, Cox, Dicarlo (2008); Why is Real-World Visual Object Recognition Hard? Available at http://www.ploscompbiol.org/article/info%3Adoi%2F10.1371%2Fjournal.pcbi.0040027

[prassanna-ravishankar]

Is there some place where they've published this code?

[justingruenberg]

Here is a python implementation of this: https://github.com/dibyadas/Visualize-Normalizations/blob/master/LocalContrastNorm.ipynb