GitLab

Summary:
This commit fixes the feature to exclude `torchaudio.prototype` module.

In `setup.py` there is a special case that is triggered if the commit is on release branch or release tag, that  excludes `torchaudio.prototype`. This was introduced to make it easy for release-related work.
It turned out that the submodules under `torchaudio.prototype`, such as `torchaudio.prototype.pipelines`, are not properly excluded from packaging.
These sub modules did not exist in previous releases, so it was not an issue.

**Note** This feature is triggered only in release branch, so the fix is not visible in the CI of this PR.
https://app.circleci.com/pipelines/github/pytorch/audio/9674/workflows/d0c9a6f1-8ca9-441a-a5f5-08926075fa39/jobs/553985?invite=true#step-104-193

The following outputs were observed when running it on local env.

* Before the change

```
$ BUILD_FFMPEG=0 BUILD_SOX=0 BUILD_CTC_DECODER=0 BUILD_RNNT=0 BUILD_KALDI=0 python setup.py clean bdist_wheel
```
```
-- Git branch: prototype-exclusion
-- Git SHA: 0af1edaa420c46be10292cbea7150c34ef80a0e1
-- Git tag: None
-- PyTorch dependency: torch
-- Building version 0.11.0+0af1eda
 --- Initializing submodules
 --- Initialized submodule
Excluding torchaudio.prototype from the package.
...
creating build/lib.macosx-11.0-arm64-3.9/torchaudio/prototype
creating build/lib.macosx-11.0-arm64-3.9/torchaudio/prototype/io
copying torchaudio/prototype/io/streamer.py -> build/lib.macosx-11.0-arm64-3.9/torchaudio/prototype/io
copying torchaudio/prototype/io/__init__.py -> build/lib.macosx-11.0-arm64-3.9/torchaudio/prototype/io
creating build/lib.macosx-11.0-arm64-3.9/torchaudio/prototype/pipelines
copying torchaudio/prototype/pipelines/__init__.py -> build/lib.macosx-11.0-arm64-3.9/torchaudio/prototype/pipelines
copying torchaudio/prototype/pipelines/rnnt_pipeline.py -> build/lib.macosx-11.0-arm64-3.9/torchaudio/prototype/pipelines
creating build/lib.macosx-11.0-arm64-3.9/torchaudio/prototype/ctc_decoder
copying torchaudio/prototype/ctc_decoder/ctc_decoder.py -> build/lib.macosx-11.0-arm64-3.9/torchaudio/prototype/ctc_decoder
copying torchaudio/prototype/ctc_decoder/__init__.py -> build/lib.macosx-11.0-arm64-3.9/torchaudio/prototype/ctc_decoder
warning: build_py: byte-compiling is disabled, skipping.
```

* After the change

```
$ BUILD_FFMPEG=0 BUILD_SOX=0 BUILD_CTC_DECODER=0 BUILD_RNNT=0 BUILD_KALDI=0 python setup.py clean bdist_wheel
```

```
-- Git branch: prototype-exclusion
-- Git SHA: 0af1edaa420c46be10292cbea7150c34ef80a0e1
-- Git tag: None
-- PyTorch dependency: torch
-- Building version 0.11.0+0af1eda
 --- Initializing submodules
 --- Initialized submodule
Excluding torchaudio.prototype from the package.
...
creating build/lib.macosx-11.0-arm64-3.9/torchaudio/models/wav2vec2
copying torchaudio/models/wav2vec2/__init__.py -> build/lib.macosx-11.0-arm64-3.9/torchaudio/models/wav2vec2
copying torchaudio/models/wav2vec2/model.py -> build/lib.macosx-11.0-arm64-3.9/torchaudio/models/wav2vec2
copying torchaudio/models/wav2vec2/components.py -> build/lib.macosx-11.0-arm64-3.9/torchaudio/models/wav2vec2
creating build/lib.macosx-11.0-arm64-3.9/torchaudio/models/wav2vec2/utils
copying torchaudio/models/wav2vec2/utils/__init__.py -> build/lib.macosx-11.0-arm64-3.9/torchaudio/models/wav2vec2/utils
copying torchaudio/models/wav2vec2/utils/import_huggingface.py -> build/lib.macosx-11.0-arm64-3.9/torchaudio/models/wav2vec2/utils
copying torchaudio/models/wav2vec2/utils/import_fairseq.py -> build/lib.macosx-11.0-arm64-3.9/torchaudio/models/wav2vec2/utils
warning: build_py: byte-compiling is disabled, skipping.
```

Pull Request resolved: https://github.com/pytorch/audio/pull/2225

Reviewed By: nateanl

Differential Revision: D34257128

Pulled By: mthrok

fbshipit-source-id: a3d6eca5803356e5aa3fe0eda82f6a9f5affb8e8