Convert inputs of batchnormalization.backward() to be C-contiguous (master) #2582
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Changed the target branch of #2580 to master.
Also I added tests that use non-c-contiguous inputs as suggested in the comments in #2580. A new argument (param_shape = (3,)) is added because cudnn is used only if
x.ndim == 4 and head_ndim == 2, which requireslen(param_shape) == 1(or ifx.ndim == 2, which requiresparam_shape == ()but it causes some inconsistency with the existing test codes).