Spectral norm value test (#121068)
Spectral norm implementation has extensive tests, but there doesn't appear to be any checking that indeed the spectral norm (= top singular value) is correctly calculated. There should at least be one such testcase.
This adds one such testcase for the parameterizations.py implementation of spectral norm.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/121068
Approved by: https://github.com/soulitzer
