I tried many things, but they all failed early. Doing this to submit a
pull request,
as asked by Fred.

Add grad() to GpuDnnConvGrad* ops

Fix recursive import. Do not make dnn import opt. opt stil import dnn

fixing #1868 Misc accumulated fixes

Fix crash at import

Revert "Fixed dependencies for theano.sandbox.cuda import"

new citation policy

Fixed dependencies for theano.sandbox.cuda import

Opt

Make automatic insertions of dnn_conv() use the optimal cuDNN code path (2)

Annotate ConvOp and GpuConv with direction hint and use this to select algorithm in conv_dnn optimizer

Remove warning caused by AdvancedSubtensor.infer_shape.

This just remove warning and to not implement the case where the
warning was generated.

Make automatic insertions of dnn_conv() use the optimal cuDNN code path