Theano/Theano — pull request #1564 by Snarfza (2013-10-16 06:44:03+00:00)
Title: Added second derivative to max downsampling function

Amended theano/tensor/signal/downsample.py to include the second derivative for the max downsampling function. This included adding grad() method to the DownsampleFactorMaxGrad op and adding DownsampleFactorMaxGradGrad op to downsample.py