Update conformer
State: closed | Pull request: yes

+ Polished the conformer code and configs.
+ Added mask_value to the specaug
+ Refactored positional embedding classes

This pull request **introduces 2 alerts** when merging 2ef5e0aa075a37fe454e06ebd21c9a1a7997e387 into 941ef1fd71bd2515a4ba7092d65146edfddc1229 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-3e6ed5bf88ad7156404b98a3a0a051245a0f4195)

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This pull request **introduces 2 alerts** when merging 7ef28967f5fbb8d29701966f1e40566f0a1212ee into 941ef1fd71bd2515a4ba7092d65146edfddc1229 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-ed3196b8925b7802817d423bbda9036096473e3a)

**new alerts:**

* 2 for Unused import

This pull request **introduces 3 alerts** when merging 8326fe1168e5bace51558a39c9320e5e036b7508 into 941ef1fd71bd2515a4ba7092d65146edfddc1229 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-48a54e2a0359191d63f68d3fb643866cfc6976af)

**new alerts:**

* 2 for Unused import
* 1 for \_\_init\_\_ method calls overridden method

This pull request **introduces 1 alert** when merging 193b2484e9f625d74c53bf4efc5bddeede5a6ae7 into 941ef1fd71bd2515a4ba7092d65146edfddc1229 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-c837f74aea24c47665c4e37be5fc1d1ca0c85142)

**new alerts:**

* 1 for \_\_init\_\_ method calls overridden method

This pull request **introduces 1 alert** when merging 8631cfafd92dfc20fef0c8cbea22400abc534479 into 941ef1fd71bd2515a4ba7092d65146edfddc1229 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-b72bc56c31c05ab4119a33c58a4b8663dcd910ee)

**new alerts:**

* 1 for \_\_init\_\_ method calls overridden method

This pull request **introduces 1 alert** when merging fba34c975d0f2fa009b96adeb9d0f7d7994eeb13 into e7b2eb641e89460e805c7106856179c82fbf1ea3 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-5ae23ef356f4b470cd4497a3b219d63dc6cf03d1)

**new alerts:**

* 1 for \_\_init\_\_ method calls overridden method

This pull request **introduces 1 alert** when merging 7d064d8cf93a11994e48b61f7ab47b794b9cf9de into 4c1d7b586fe764894f3468a11369aebc4962fa9f - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-53df09955c43d9b75f3cbdffb02c8a196f1d051c)

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@vsl9 , @jbalam-nv  and @blisc could you please double-check changes to WER computation: ``nemo/collections/asr/metrics/wer.py``

This pull request **introduces 2 alerts** when merging 5a72dffc97ce5d4c99e93318b46020fea3ef9da4 into 4fe96b152a74ba2dd3e044cd76fe91dfda566c08 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-baf49f0ba3e564020ae4f571599d9329b02cb3e9)

**new alerts:**

* 1 for Unused import
* 1 for \_\_init\_\_ method calls overridden method

This pull request **introduces 1 alert** when merging f5f622c37685d654c09c247a3b539be70bf54fad into 4fe96b152a74ba2dd3e044cd76fe91dfda566c08 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-69d03bd9277e7e56943c59c9c987d6596e190e35)

**new alerts:**

* 1 for \_\_init\_\_ method calls overridden method

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**new alerts:**

* 1 for \_\_init\_\_ method calls overridden method