Flip the filter for finding matched patch

[Huihui94]

In the patches.py file, there is a method called find_patch_matches. I wonder to know why the third and forth dimension of b should be changed to b[:, :, ::-1, ::-1]
if convs is None:
convs = K.conv2d(a, b[:, :, ::-1, ::-1], border_mode='valid')
Thank you so much!

[gjpicker]

the filter_flip=True is the default param of conv2d ,which belong to theano.sandbox.cuda.dnn.dnn_conv or theano.tensor.nnet that is latest update to replace dnn

so , conv2d(input,b[:, :, ::-1, ::-1]) is equal to conv2d(input,b,filter_flip=False) where filter_flip is explictly defined to False in func's param .

otherwise ,filter_flip is explained in this_link