Neural Clustering model
This pull request **introduces 26 alerts** when merging 426bfeebea7528ea52a4ab130076546f2a37c7e6 into 4781d1744765fafdcd1238d8d4a9c3f94057aa23 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-5739c24c7c6ab00b4184aecc25110c9ddffdeb5a)

**new alerts:**

* 14 for Unused import
* 8 for Unused local variable
* 2 for &#39;import \*&#39; may pollute namespace
* 1 for Illegal raise
* 1 for Variable defined multiple times