Also allow f-contiguous mat in Gpu sger.

Instead of just crashing the program.

This enables calling CudaNdarray_Copy on a const CudaNdarray*,
which was previously impossible.

It is an error in recent versions of Vim.

Make a machanism to don't have Alloc and GpuAlloc constant folded in som...

pep8 fix + added verbose exception

Small fixes

Add shape inference for sparse/basic.py Ops

A few PEP8 fixes, string formatting and cosmetic stuff.

more pep8 fixes

various other pep8 fixes so that being pep8 compliant doesn't take as
much time

Some more typo fixes & co

Cache

Fix reduce