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Summary:
This PR adds AV-ASR recipe which contains sample implementations of training and evaluation pipelines for RNNT based automatic, visual, and audio-visual (ASR, VSR, AV-ASR) models on LRS3. This repository includes both streaming/non-streaming modes.

CC stavros99 xiaohui-zhang YumengTao mthrok nateanl hwangjeff

Pull Request resolved: https://github.com/pytorch/audio/pull/3278

Reviewed By: nateanl

Differential Revision: D46121550

Pulled By: mpc001

fbshipit-source-id: bb44b97ae25e87df2a73a707008be46af4ad0fc6

Summary:
Adds Conformer RNN-T LibriSpeech training recipe to examples directory.

Produces 30M-parameter model that achieves the following WER:

|                     |          WER |
|:-------------------:|-------------:|
| test-clean          |       0.0310 |
| test-other          |       0.0805 |
| dev-clean           |       0.0314 |
| dev-other           |       0.0827 |

Pull Request resolved: https://github.com/pytorch/audio/pull/2329

Reviewed By: xiaohui-zhang

Differential Revision: D35578727

Pulled By: hwangjeff

fbshipit-source-id: afa9146c5b647727b8605d104d928110a1d3976d

Summary: Pull Request resolved: https://github.com/pytorch/audio/pull/2237

Reviewed By: mthrok

Differential Revision: D34267000

Pulled By: nateanl

fbshipit-source-id: 4c264aea6cf3fba5d8728d5fe60f9f471815852d

Summary:
Adds SentencePiece model training script for LibriSpeech Emformer RNN-T example recipe; updates readme with references.

Pull Request resolved: https://github.com/pytorch/audio/pull/2218

Reviewed By: nateanl

Differential Revision: D34177295

Pulled By: hwangjeff

fbshipit-source-id: 9f32805af792fb8c6f834f2812e20104177a6c43