QA squad update tutorial and example script with usage examples
This pull request **introduces 3 alerts** when merging 916b8c79da313e93bf92ab7fed0d2f0e5436b2d9 into 730da9886249c8f4acc766b0bde516a14681ac00 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-53d748f2d12e33432e771ec04560e9d2cba50fb0)

**new alerts:**

* 2 for Unused import
* 1 for Unused local variable
QA squad update tutorial and example script with usage examples after model changes