Itn add classes
This pull request **introduces 1 alert** when merging fe433b5014740ebc502c7562933de52402e2a7a5 into c5426c871d7ae7a006f496e33d2977d1791ebe51 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-f9718579a2247addeb8826e193a17d91647924cb)

**new alerts:**

* 1 for Unused import