gamma and beta dimensionality error in GroupNorm operator

[wintersurvival]

Description

In the implement of mxnet.sym.GroupNorm，the size of gamma and beta is (group_number,)。However, in the paper of group norm the size of gamma and beta is (channel_number,) like the way of batchnorm.

Error Message

To Reproduce

Steps to reproduce

What have you tried to solve it?

Environment

mxnet v1.6.0

paste outputs here

[sxjscience]

Should be a bug @haojin2 .

[samskalicky]

@apeforest assign [@haojin2 ]
feel free to re-assign to the appropriate person

[mikeobr]

Group Norm is available in the latest 1.6 release, does this issue mean it shouldn't be used?

[yzhliu]

fixed by #18199