WIP: Restoring Megatron unit test; Fixing Megatron initialization; unused …
This pull request **introduces 4 alerts** and **fixes 8** when merging dca86d9367a59e969c14dd3bac2321db6e9a7b16 into 25abffdd37efb3a9f5a6e236d910f045271ae08f - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-ec901cb9fdf53607236db93f64f526687b49cea5)

**new alerts:**

* 2 for Unused local variable
* 2 for Unused import

**fixed alerts:**

* 8 for Unused import This pull request **introduces 2 alerts** and **fixes 8** when merging 67d8abe00438996aabf3312be19582154179cdf5 into dacdb1ad4286731f50fa33c0a74b04089d373f44 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-9972ff061575ee90629df37c3370ed78841afaaa)

**new alerts:**

* 2 for Unused import

**fixed alerts:**

* 8 for Unused import @borisfom is this still WIP? This pull request **introduces 2 alerts** and **fixes 8** when merging 7ff3e50ac34475c813c0e4ca54f61771905f0a7b into 16b87d1f7d22126b8eb471ca0538f75ade9620cf - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-31349133ef976f22408b5b7f7a72f3f40edba1b3)

**new alerts:**

* 2 for Unused import

**fixed alerts:**

* 8 for Unused import
…exports/functions cleanup

Signed-off-by: Boris Fomitchev <bfomitchev@nvidia.com>