Few fixes to enable backtranslation again
This pull request **fixes 3 alerts** when merging a0d7a2c00d22791313e5404ac1654023f4eb0ec0 into e59dd39f6f847155a82d40ebe2264a0b7f2b7a13 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-fca57bc50d3f751d5d455b5490d473ee1719d621)

**fixed alerts:**

* 3 for Unused import This pull request **fixes 3 alerts** when merging 1c1c37403c2dbd93004959ed5ac8c87f2c6bd0f8 into dddf87e22a6e87a0e2698d4aa0653f963564d755 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-bde2e8d3ff9b822f6dea1badb045846bac6112c3)

**fixed alerts:**

* 3 for Unused import