Hmm. On of those days, have to plug it into my sngan workbook to reproduce the failure.
Is this with master or an older version? I think we improved spectral norm at least before 0.4.1, but possibly also after.
On master, I think we expect spectral norm to give the same weight in eval mode as the last time in non-eval mode. Would you be able to check that (by saving the weight.)
Best regards
Thomas