Fastpitch export
This pull request **introduces 3 alerts** and **fixes 1** when merging e99c2fbea67b64a856bd9d59420ad32249fde875 into d23ee3e3d5ed2fd17608b736ebae2b415a258a9e - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-f7d8f6f310df97f17db8897a9e541b9001de6c60)

**new alerts:**

* 3 for Unused import

**fixed alerts:**

* 1 for Unused import
Dependant on https://github.com/NVIDIA/NeMo/pull/2278
