[Bug] Custom Distillation MMSeg CWD loss nan problem

[Priyanshu88]

Describe the bug

I am training the segnext_l model as a standard teacher on my data and keeping the checkpoint obtained for distillation(mmseg/cwd) from segnext_l--->segnext_tiny. When doing this after starting few iterations i am getting all losses as nan for all upcoming iterations.

I am using all the latest versions .

The results of student model also remains 0.