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* Update transforms.py

* Update train.py

* Simplify trainining step in av-asr recipe

* Run pre-commit

Summary:
This PR is to include few changes in the AV-ASR recipe. The changes include better results, a faster face detector (Mediapipe), renamed variable names, a streamlined dataloader, and a few illustrated examples. These changes were made to improve the usability of the recipe.

Pull Request resolved: https://github.com/pytorch/audio/pull/3493

Reviewed By: mthrok

Differential Revision: D47758072

Pulled By: mpc001

fbshipit-source-id: 4533587776f3a7a74f3f11b0ece773a0934bacdc

Summary: Pull Request resolved: https://github.com/pytorch/audio/pull/3489

Reviewed By: mthrok

Differential Revision: D47726448

Pulled By: mpc001

fbshipit-source-id: 3d5aa7646c6bb816dcbbf70c61e98404bb148841

Summary:
This PR adds a data preparation recipe that uses the ultra face detector to extract full-face video. The resulting video output is then used as input for training and evaluating RNNT-based models for automatic speech recognition (ASR), visual speech recognition (VSR), and audio-visual ASR (AV-ASR) on the LRS3 dataset.

This PR also updates the word error rate (WER) for AV-ASR LRS3 models and improves the code readability.

Pull Request resolved: https://github.com/pytorch/audio/pull/3421

Reviewed By: mpc001

Differential Revision: D46799748

Pulled By: mthrok

fbshipit-source-id: 97af3feac0592b240617faaffa4c0ac8cef614a9

Summary: Pull Request resolved: https://github.com/pytorch/audio/pull/3410

Differential Revision: D46496786

Pulled By: mthrok

fbshipit-source-id: e517b273c40b340f39ce7db7ab1be1c3eb5f2059

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