Flake8 for test_blas.py

Use GpuDnnReduction to replace GpuMaxAndArgmax when possible.

Fix alerts found with lgtm

Only compare to scipy timing in FAST_RUN.

Make sure MRG uniform in float16 do not return 0

Implement grad for AbstractBatchNormTrainGrad

Add debug code to print algo chosen at runtime for cuDNN convolutions.

Let filter_variable fix broadcast between GPU vars

Repack the pickle with protocol 2 and open in binary mode.

Implementing `GpuAdvancedIncSubtensor`

Correct a typo in make_node function (tensore.nnet.SoftmaxWithBias)