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Summary:
Adds unit tests for Emformer RNN-T LibriSpeech recipe. Also makes changes to recipe to resolve errors with pickling lambda functions in Windows.

Pull Request resolved: https://github.com/pytorch/audio/pull/2216

Reviewed By: nateanl

Differential Revision: D34171480

Pulled By: hwangjeff

fbshipit-source-id: 5fcebb457051f3041766324863728411180f5e1e

Summary:
Consolidates LibriSpeech and TED-LIUM Release 3 Emformer RNN-T training recipes in a single directory.

Pull Request resolved: https://github.com/pytorch/audio/pull/2212

Reviewed By: mthrok

Differential Revision: D34120104

Pulled By: hwangjeff

fbshipit-source-id: 29c6e27195d5998f76d67c35b718110e73529456

Summary:
Moves ASR features out of `torchaudio.prototype`. Specifically, merges contents of `torchaudio.prototype.models` into `torchaudio.models` and contents of `torchaudio.prototype.pipelines` into `torchaudio.pipelines` and updates refs, tests, and docs accordingly.

Pull Request resolved: https://github.com/pytorch/audio/pull/2187

Reviewed By: nateanl, mthrok

Differential Revision: D33918092

Pulled By: hwangjeff

fbshipit-source-id: f003f289a7e5d7d43f85b7c270b58bdf2ed6344c

Summary:
Adds script for generating global feature statistics along with new feature statistics json for LibriSpeech RNN-T training recipe.

Pull Request resolved: https://github.com/pytorch/audio/pull/2183

Reviewed By: mthrok

Differential Revision: D33902377

Pulled By: hwangjeff

fbshipit-source-id: ec347a685ae67aefc485084aac6ed2efd653250f

Summary: Pull Request resolved: https://github.com/pytorch/audio/pull/2178

Reviewed By: mthrok

Differential Revision: D33797649

Pulled By: nateanl

fbshipit-source-id: 7a8f54294e7b5bd4d343c8e361e747bfd8b5b603

Summary:
Regroup RNN-T components under `torchaudio.prototype.models` and `torchaudio.prototype.pipelines`.

Updated docs: https://492321-90321822-gh.circle-artifacts.com/0/docs/prototype.html

Pull Request resolved: https://github.com/pytorch/audio/pull/2110

Reviewed By: carolineechen, mthrok

Differential Revision: D33354116

Pulled By: hwangjeff

fbshipit-source-id: 9cf4afed548cb173d56211c16d31bcfa25a8e4cb

Summary:
Pull Request resolved: https://github.com/pytorch/audio/pull/2096

run: `arc lint --apply-patches --paths-cmd 'hg files -I "./**/*.py"'`

Reviewed By: mthrok

Differential Revision: D33297351

fbshipit-source-id: 7bf5956edf0717c5ca90219f72414ff4eeaf5aa8

Summary:
Add training recipe for RNN-T Emformer ASR model to examples directory.

Pull Request resolved: https://github.com/pytorch/audio/pull/2052

Reviewed By: nateanl

Differential Revision: D32814096

Pulled By: hwangjeff

fbshipit-source-id: a5153044efc16cb39f0e6413369a6791637af76a