GitLab

Summary:
I have added BarkScale transform, which can transform a regular Spectrogram into a BarkSpectrograms similar to MelScale. ahmed-fau opened this requirement in December 2021 with the number (https://github.com/pytorch/audio/issues/2103). The new functionality includes three different well-known approximations of the Bark scale.

Pull Request resolved: https://github.com/pytorch/audio/pull/2823

Reviewed By: nateanl

Differential Revision: D41162100

Pulled By: carolineechen

fbshipit-source-id: b2670c4972e49c9ef424da5d5982576f7a4df831

Summary:
internal comparison tests: D40080919

follow up PR for pretrained models https://github.com/pytorch/audio/issues/2827

Pull Request resolved: https://github.com/pytorch/audio/pull/2826

Reviewed By: nateanl

Differential Revision: D41160061

Pulled By: carolineechen

fbshipit-source-id: f3c478b28c235af53d1d8e21b573c53684a63ac4

Summary:
Closes T136364380

Added [WavLM Model](https://github.com/microsoft/UniSpeech/tree/main/WavLM):
- Added `WavLMSelfAttention` class (from [original implementation](https://github.com/microsoft/UniSpeech/blob/2e9dde8bf815a5f5fd958e3435e5641f59f96928/WavLM/modules.py)) and adjusted existing Encoder and Transformer classes to be compatible with it
- Added factory functions `wavlm_model`, `wavlm_base`, `wavlm_large` to `models/wav2vec2/model.py`
- Added bundles for base and large models to pipelines. **TODO**: pre-trained model weights are not yet uploaded to `download.pytorch.org`, permissions not granted yet.

## Tests
- Expanded HuggingFace integration tests to cover WavLM. For there tests, added JSON configs for base and large models from HF ([base](https://huggingface.co/microsoft/wavlm-base/blob/main/config.json), [large](https://huggingface.co/microsoft/wavlm-large/blob/main/config.json)) into test assets
- Expanded TorchScript and quantization tests to cover WavLM

## Comments
There are a few workarounds I had to introduce:
- Quantization tests for WavLM were breaking down at [`torch.cat`](https://github.com/pytorch/audio/pull/2822/files#diff-6f1486901c94320ec0610a460dc674638fab9d104a61564ff7b59353a8b8547cR466) ~~until I excluded the arguments of `torch.cat` from quantization [here](https://github.com/pytorch/audio/pull/2822/files#diff-6f1486901c94320ec0610a460dc674638fab9d104a61564ff7b59353a8b8547cR368-R369). I haven't found a better way to fix it, let me know if there is one~~ The reason for this seems to be that quantization replaces `.bias` and `.weight` attributes of a `Linear` module with methods. Since we are using weights and biases directly, the code was break. The final solution suggested by nateanl was to define attention weights and biases directly in `WavLMSelfAttention`, skipping the `Linear` layers
- ~~WavLM uses position embedding in the first layer of encoder, but not in the subsequent ones.  So [UniSpeech](https://github.com/microsoft/UniSpeech/blob/2e9dde8bf815a5f5fd958e3435e5641f59f96928/WavLM/modules.py#L342) and [HF](https://github.com/huggingface/transformers/blob/b047472650cba259621549ac27b18fd2066ce18e/src/transformers/models/wavlm/modeling_wavlm.py#L441-L442) implementations only create this embedding module in the layers where it's used. However, we can't do this here because it breaks TorchScript. So as a solution I add a dummy `Identity` module to `WavLMSelfAttention` when the actual embedding is not needed: [here](https://github.com/pytorch/audio/pull/2822/files#diff-6f1486901c94320ec0610a460dc674638fab9d104a61564ff7b59353a8b8547cR361-R368).~~ Thanks nateanl for resolving this!
- I had to add dummy `position_bias` and `key_padding_mask` arguments to `SelfAttention.forward` to make TorchScript tests pass. Since both `SelfAttention` and `WavLMSelfAttention` are called from `EncoderLayer`, they need to have compatible signatures. Having a variable number of arguments with `**kwargs` or checking object class doesn't seem to work with TorchScript, so I instead made both types of attention accept `position_bias` and `key_padding_mask` arguments.

Nit: do we still need to specify `__all__` if there are no wildcard imports in `__init__.py`, e.g. in `torchaudio/models/__init__.py`?

Pull Request resolved: https://github.com/pytorch/audio/pull/2822

Reviewed By: nateanl

Differential Revision: D41121855

Pulled By: sgrigory

fbshipit-source-id: 9f4f787e5810010de4e74cb704063a26c66767d7

Summary:
Adds `torch.nn.Module`-based implementations for convolution and FFT convolution.

Pull Request resolved: https://github.com/pytorch/audio/pull/2811

Reviewed By: carolineechen

Differential Revision: D40881937

Pulled By: hwangjeff

fbshipit-source-id: bfe8969e6178ad4f58981efd4b2720ac006be8de

Summary: Pull Request resolved: https://github.com/pytorch/audio/pull/2825

Reviewed By: carolineechen

Differential Revision: D40954522

Pulled By: mthrok

fbshipit-source-id: 433fb856a74a340af4d49e5c65a6270f0b00c835

Summary:
PyTorch logo is included in pytorch doc theme, (and cannot be changed without custom CSS) so no need to have them here.

Pull Request resolved: https://github.com/pytorch/audio/pull/2824

Reviewed By: carolineechen

Differential Revision: D40954564

Pulled By: mthrok

fbshipit-source-id: 5e9a91fddcc92c141baf1996f721c09c037fb003

Summary:
<img width="756" alt="Screen Shot 2022-11-01 at 3 32 58 PM" src="https://user-images.githubusercontent.com/855818/199173348-f463ae71-438c-4dad-a481-b65522a8e52f.png">

Pull Request resolved: https://github.com/pytorch/audio/pull/2812

Reviewed By: carolineechen

Differential Revision: D40919942

Pulled By: mthrok

fbshipit-source-id: 18e5a709c262fb0b15ada0d303f1d0dee033beb1

Summary:
This commit re-organizes the tutorials.

1. Put all the tutorials in the left bar and make the section **folded by default**.
2. Add pytorch/tutorials-like cards in index
3. Move feature classifications to a dedicated page.

https://output.circle-artifacts.com/output/job/1f1a04a5-137e-428d-9da4-c46f59eeffa4/artifacts/0/docs/index.html

<img width="1073" alt="Screen Shot 2022-10-28 at 7 34 29 AM" src="https://user-images.githubusercontent.com/855818/198410686-3ef40ad2-c9c9-443c-800e-6e51e1b6a491.png">

Pull Request resolved: https://github.com/pytorch/audio/pull/2767

Reviewed By: carolineechen

Differential Revision: D40627547

Pulled By: mthrok

fbshipit-source-id: 098b825f242e91919126014abdab27852304ae64

Summary:
address https://github.com/pytorch/audio/issues/2780

Pull Request resolved: https://github.com/pytorch/audio/pull/2781

Reviewed By: carolineechen, mthrok

Differential Revision: D40556794

Pulled By: nateanl

fbshipit-source-id: b24912489d41e5663b4b4dcfb8be743fb962097e

Summary:
* Document `__call__` instead of `__init__`
* List CTCHypothesis first as it is used in combination with CTCDecoder
* Fix indentation of score method docstring

Pull Request resolved: https://github.com/pytorch/audio/pull/2766

Reviewed By: carolineechen

Differential Revision: D40349388

Pulled By: mthrok

fbshipit-source-id: 5e512e6c2b29d3533eb62d09b289154ccd1abf4c

Summary:
Adding and updating author information.

Pull Request resolved: https://github.com/pytorch/audio/pull/2764

Reviewed By: carolineechen

Differential Revision: D40332427

Pulled By: mthrok

fbshipit-source-id: 4f04c7351386c122e3b0a45c2ed1757a04b7dc9a

Summary: Pull Request resolved: https://github.com/pytorch/audio/pull/2738

Reviewed By: carolineechen

Differential Revision: D40238099

Pulled By: nateanl

fbshipit-source-id: c5cc94c2a348a6ef34c04b8dd26114ecb874d73e

Summary: Pull Request resolved: https://github.com/pytorch/audio/pull/2732

Reviewed By: nateanl

Differential Revision: D40186996

Pulled By: nateanl

fbshipit-source-id: a0ad325b7153c9e580dad2c515730dadbe8840c4

Summary:
* Add HW encoding to HW tutorial

https://colab.research.google.com/drive/1DDah_IaGULEO66CfQWltRqaVheBkiXdN#scrollTo=eXzKSVrHk1vS

Pull Request resolved: https://github.com/pytorch/audio/pull/2739

Reviewed By: hwangjeff

Differential Revision: D40197086

Pulled By: hwangjeff

fbshipit-source-id: 1780a5419f6705f7c24ba96bd46c3310438af7db

Summary:
Specifying multiple object in `:minigallery:` directive shows duplicated tutorials.

This commit fixes it by listing tutorials based on module used.

https://output.circle-artifacts.com/output/job/c3da2a22-40d5-4e2d-b73a-28b39e712817/artifacts/0/docs/io.html

Before:
<img width="694" alt="Screen Shot 2022-10-07 at 7 04 35 AM" src="https://user-images.githubusercontent.com/855818/194427092-ca1202e7-0731-4c18-b48b-24923d692a4a.png">

After:

<img width="648" alt="Screen Shot 2022-10-07 at 7 03 14 AM" src="https://user-images.githubusercontent.com/855818/194426950-5b780458-2bf0-43ef-b020-fcbbfdf8d41b.png">

Pull Request resolved: https://github.com/pytorch/audio/pull/2736

Reviewed By: carolineechen

Differential Revision: D40160247

Pulled By: carolineechen

fbshipit-source-id: 547496f9b569ff7a4d70db97e90f3ea503344477

Summary:
Add a tutorial for basic usage of torchaudio.io.StreamWriter.

https://output.circle-artifacts.com/output/job/55d9a495-af7a-483c-84cb-de9a08cfd2f3/artifacts/0/docs/tutorials/streamwriter_basic_tutorial.html

Pull Request resolved: https://github.com/pytorch/audio/pull/2698

Reviewed By: carolineechen

Differential Revision: D40133007

Pulled By: carolineechen

fbshipit-source-id: 141f692c32343981bfb228357f21562ffe36f623

Summary:
* Port downstream change https://github.com/pytorch/tutorials/pull/2060
* Fix inter-tutorial links and references

Pull Request resolved: https://github.com/pytorch/audio/pull/2733

Reviewed By: hwangjeff

Differential Revision: D40086902

Pulled By: hwangjeff

fbshipit-source-id: 00b04c6a1b68fb9fadd52b610b26ecaab15d52d8

Summary:
https://output.circle-artifacts.com/output/job/213c71c8-c9b5-4516-af92-a2f8dab2c9fd/artifacts/0/docs/tutorials/streamwriter_advanced.html

Pull Request resolved: https://github.com/pytorch/audio/pull/2708

Reviewed By: carolineechen

Differential Revision: D40013310

Pulled By: mthrok

fbshipit-source-id: 7226b021ce2fe951b3bf0bd41e93a6bbcf696124

Summary:
Adopt `:autosummary:` to various modules

    * torchaudio.compliance.kaldi
    * torchaudio.sox_effects
    * torchaudio.utils

Pull Request resolved: https://github.com/pytorch/audio/pull/2664

Reviewed By: nateanl

Differential Revision: D39841873

Pulled By: mthrok

fbshipit-source-id: ff4fa6976324fca5f35b737b715f976e2a722bac

Summary:
Since that new tutorials for StreamWriter are being added, there are more tutorials for media IO than the rest.
So this commit introduces sub-index for IO tutorials.

Pull Request resolved: https://github.com/pytorch/audio/pull/2703

Reviewed By: carolineechen

Differential Revision: D39769049

Pulled By: mthrok

fbshipit-source-id: 19a3981bc624fdce1d5d703c67e28a751a15e812

Summary:
* Introduce the mini-index at `torchaudio.datasets` page.
* Standardize the format of return type docstring.

https://output.circle-artifacts.com/output/job/989328b2-0270-4958-b577-19cf749af3fd/artifacts/0/docs/datasets.html

<img width="936" alt="Screen Shot 2022-09-21 at 6 56 52 PM" src="https://user-images.githubusercontent.com/855818/191475141-a97f2bea-705f-49bc-8c34-6ec869e76793.png">

https://output.circle-artifacts.com/output/job/989328b2-0270-4958-b577-19cf749af3fd/artifacts/0/docs/generated/torchaudio.datasets.CMUDict.html#torchaudio.datasets.CMUDict

<img width="1069" alt="Screen Shot 2022-09-21 at 6 57 32 PM" src="https://user-images.githubusercontent.com/855818/191475293-e3302528-27ea-4212-9c12-fd6d900fdf3e.png">

Pull Request resolved: https://github.com/pytorch/audio/pull/2692

Reviewed By: carolineechen

Differential Revision: D39687463

Pulled By: mthrok

fbshipit-source-id: 4175fc15388817d2fe76206188618dd1576281df

Summary:
* Introduce the mini-index at `torchaudio.pipelines` page.
* Add introductions
* Update pipeline tutorials

https://output.circle-artifacts.com/output/job/ccc57d95-1930-45c9-b967-c8d477d35f29/artifacts/0/docs/pipelines.html

<img width="1163" alt="Screen Shot 2022-09-20 at 1 23 29 PM" src="https://user-images.githubusercontent.com/855818/191167049-98324e93-2e16-41db-8538-3b5b54eb8224.png">

<img width="1115" alt="Screen Shot 2022-09-20 at 1 23 49 PM" src="https://user-images.githubusercontent.com/855818/191167071-4770f594-2540-43a4-a01c-e983bf59220f.png">

https://output.circle-artifacts.com/output/job/ccc57d95-1930-45c9-b967-c8d477d35f29/artifacts/0/docs/generated/torchaudio.pipelines.RNNTBundle.html#torchaudio.pipelines.RNNTBundle

<img width="1108" alt="Screen Shot 2022-09-20 at 1 24 18 PM" src="https://user-images.githubusercontent.com/855818/191167123-51b33a5f-c30c-46bc-b002-b05d2d0d27b7.png">

Pull Request resolved: https://github.com/pytorch/audio/pull/2689

Reviewed By: carolineechen

Differential Revision: D39691253

Pulled By: mthrok

fbshipit-source-id: ddf5fdadb0b64cf2867b6271ba53e8e8c0fa7e49

Summary:
* Introduce the mini-index at `torchaudio.models` page.

https://output.circle-artifacts.com/output/job/25e59810-3866-4ece-b1b7-8a10c7a2286d/artifacts/0/docs/models.html

<img width="1042" alt="Screen Shot 2022-09-20 at 1 20 50 PM" src="https://user-images.githubusercontent.com/855818/191166816-83314ad1-8b67-475b-aa10-d4cc59126295.png">

<img width="1048" alt="Screen Shot 2022-09-20 at 1 20 58 PM" src="https://user-images.githubusercontent.com/855818/191166829-1ceb65e0-9506-4328-9a2f-8b75b4e54404.png">

Pull Request resolved: https://github.com/pytorch/audio/pull/2690

Reviewed By: carolineechen

Differential Revision: D39654948

Pulled By: mthrok

fbshipit-source-id: 703d1526617596f647c85a7148f41ca55fffdbc8

Summary:
https://output.circle-artifacts.com/output/job/b23174d2-5cee-4ee9-be39-3228b9ae4abe/artifacts/0/docs/functional.html

<img width="1133" alt="Screen Shot 2022-09-20 at 11 19 23 AM" src="https://user-images.githubusercontent.com/855818/191152824-96c5b16c-bd38-4656-b1ae-0b58699dbd62.png">

Pull Request resolved: https://github.com/pytorch/audio/pull/2693

Reviewed By: carolineechen

Differential Revision: D39650930

Pulled By: mthrok

fbshipit-source-id: 28b5b03d21b922e37e02bfddda2bf1dea696cc18

Summary:
* Introduce the mini-index at `torchaudio.transforms` page.
* Add "Augmentations" subsection.
* Also updated the overall introduction.

https://output.circle-artifacts.com/output/job/1b65246a-403c-4d2c-b97d-d1b582d8b4e5/artifacts/0/docs/transforms.html

<img width="721" alt="Screen Shot 2022-09-16 at 5 20 08 PM" src="https://user-images.githubusercontent.com/855818/190591795-97c169db-a95b-480a-8d3c-d80072efa045.png">

<img width="755" alt="Screen Shot 2022-09-16 at 5 20 28 PM" src="https://user-images.githubusercontent.com/855818/190591828-03026918-febd-4194-91aa-7d8f704e17cc.png">

Pull Request resolved: https://github.com/pytorch/audio/pull/2683

Reviewed By: carolineechen

Differential Revision: D39574255

Pulled By: mthrok

fbshipit-source-id: a4beed7cacbb5184bad96efa903a3a1123dab627

Summary:
* Adopts `:autosummary:` in decoder module doc
* Hide the constructor signature of `CTCDecoder` as `ctc_decoder` function is the one client code is supposed to be using.
* Introduce `children` property to `CTCDecoderLMState` otherwise it does not show up in the doc.

https://output.circle-artifacts.com/output/job/7aac5eb9-7d2d-4f63-bcdf-83a6f40b4e5a/artifacts/0/docs/models.decoder.html

<img width="748" alt="Screen Shot 2022-09-16 at 5 23 22 PM" src="https://user-images.githubusercontent.com/855818/190592409-0c2ec8a4-d2cf-4d76-a965-8a570faaeb1a.png">

https://output.circle-artifacts.com/output/job/7aac5eb9-7d2d-4f63-bcdf-83a6f40b4e5a/artifacts/0/docs/generated/torchaudio.models.decoder.CTCDecoder.html#torchaudio.models.decoder.CTCDecoder

<img width="723" alt="Screen Shot 2022-09-16 at 5 23 53 PM" src="https://user-images.githubusercontent.com/855818/190592501-3fad1e07-ae3e-44f5-93be-f33181025390.png">

Pull Request resolved: https://github.com/pytorch/audio/pull/2684

Reviewed By: carolineechen

Differential Revision: D39574272

Pulled By: mthrok

fbshipit-source-id: d977660bd46f5cf98c535adbf2735be896b28773

Summary:
This commit adopts :autosummary: directive to `torchaudio.io` module.
It adds table of contents on `torchaudio.io` level.

https://output.circle-artifacts.com/output/job/282089d1-c120-4d22-809f-0e0ac0947c37/artifacts/0/docs/io.html
<img width="1094" alt="Screen Shot 2022-09-16 at 7 33 32 AM" src="https://user-images.githubusercontent.com/855818/190520248-27e469f8-7689-4dc2-b591-7b3f08bb4dff.png">

https://output.circle-artifacts.com/output/job/282089d1-c120-4d22-809f-0e0ac0947c37/artifacts/0/docs/generated/torchaudio.io.StreamReader.html#torchaudio.io.StreamReader
<img width="1108" alt="Screen Shot 2022-09-16 at 7 33 59 AM" src="https://user-images.githubusercontent.com/855818/190520292-d090fed0-2f18-4961-b9f3-9e4808fd437e.png">

Pull Request resolved: https://github.com/pytorch/audio/pull/2681

Reviewed By: carolineechen

Differential Revision: D39560459

Pulled By: mthrok

fbshipit-source-id: 3de5f22b8d8d0834dfd8bac8619fbfaa44c5f4dd

Summary:
Previous versions of Sphinx reported wrong path for return class. This issue is fixed on the latest Sphinx.

It allows to remove the patch we apply in `conf.py`. This is essential for the adoptation of `:autosummary:`, as it won't render correctly with the patch.

https://output.circle-artifacts.com/output/job/19d93ede-08de-4b9e-9d66-67ca5dab964e/artifacts/0/docs/pipelines.html

Pull Request resolved: https://github.com/pytorch/audio/pull/2678

Reviewed By: carolineechen

Differential Revision: D39509447

Pulled By: mthrok

fbshipit-source-id: e104bc6a87f32cba6c549a9fe8f2d1e489ee27e4

Summary:
Preparation for the adoptation of `autosummary`.

Replace `:footcite:` with `:cite:` and introduce dedicated reference page, as `:footcite:` does not work well with `autosummary`.

Example:

https://output.circle-artifacts.com/output/job/4da47ba6-d9c7-418e-b5b0-e9f8a146a6c3/artifacts/0/docs/datasets.html#cmuarctic

https://output.circle-artifacts.com/output/job/4da47ba6-d9c7-418e-b5b0-e9f8a146a6c3/artifacts/0/docs/references.html

Pull Request resolved: https://github.com/pytorch/audio/pull/2676

Reviewed By: carolineechen

Differential Revision: D39509431

Pulled By: mthrok

fbshipit-source-id: e6003dd01ec3eff3d598054690f61de8ee31ac9a

Summary: Pull Request resolved: https://github.com/pytorch/audio/pull/2675

Reviewed By: carolineechen

Differential Revision: D39515996

Pulled By: nateanl

fbshipit-source-id: 5824375f6a758af21b6ad6c635dd06081663644f

Summary:
Currently, the way feature badges are generated assumes that both documentations and the supported features page are on the same level from the root.

This does not work when we introduce `:autosummary:` which generates individual documentation pages one level below.

This commit changes it so that links to the supported features page are properly relative from the documentation level.

There is no appearance change from this commit.

Pull Request resolved: https://github.com/pytorch/audio/pull/2677

Reviewed By: carolineechen

Differential Revision: D39507451

Pulled By: mthrok

fbshipit-source-id: f18da4201f0eb747586be21c8bd9a958217aebc2

Summary:
modifications to ctc decoder LM docstrings on top of https://github.com/pytorch/audio/issues/2657

Pull Request resolved: https://github.com/pytorch/audio/pull/2658

Reviewed By: mthrok

Differential Revision: D39468921

Pulled By: carolineechen

fbshipit-source-id: c5497cc2fa22fb98a304d037e27c91bf68a9ad6a

Summary: Pull Request resolved: https://github.com/pytorch/audio/pull/2673

Reviewed By: mthrok

Differential Revision: D39507612

Pulled By: carolineechen

fbshipit-source-id: 3a9ee53f72cabd6e3085c76867017be4a6ed7f53

Summary: Pull Request resolved: https://github.com/pytorch/audio/pull/2669

Reviewed By: carolineechen, mthrok

Differential Revision: D39433560

Pulled By: nateanl

fbshipit-source-id: 5b652b31c00badb37b27a32ac25b422a5bcc74cb

Summary: Pull Request resolved: https://github.com/pytorch/audio/pull/2668

Reviewed By: nateanl, mthrok

Differential Revision: D39433671

Pulled By: carolineechen

fbshipit-source-id: 3545a5b4019832861c34fd8c05e5f8600fd80d5c

Summary:
1. Override class `__module__` attribute in `conf.py` so that no manual override is necessary
2. Fix SourceSeparationBundle member attribute

Pull Request resolved: https://github.com/pytorch/audio/pull/2656

Reviewed By: carolineechen

Differential Revision: D39293053

Pulled By: mthrok

fbshipit-source-id: 2b8d6be1aee517d0e692043c26ac2438a787adc6

Summary:
This commit adds FFmpeg-based encoder StreamWriter class.
StreamWriter is pretty much the opposite of StreamReader class, and
it supports;

* Encoding audio / still image / video
* Exporting to local file / streaming protocol / devices etc...
* File-like object support (in later commit)
* HW video encoding (in later commit)

See also: https://fburl.com/gslide/z85kn5a9 (Meta internal)

Pull Request resolved: https://github.com/pytorch/audio/pull/2628

Reviewed By: nateanl

Differential Revision: D38816650

Pulled By: mthrok

fbshipit-source-id: a9343b0d55755e186971dc96fb86eb52daa003c8

Summary:
The minor release fixes some gallery issue, which allows to remove
some of the customization we had in https://github.com/pytorch/audio/issues/2629

https://output.circle-artifacts.com/output/job/553a9b98-8260-4cb4-a681-20ef97d2c33e/artifacts/0/docs/pipelines.html#torchaudio.pipelines.Wav2Vec2ASRBundle

Pull Request resolved: https://github.com/pytorch/audio/pull/2638

Reviewed By: carolineechen, nateanl

Differential Revision: D38909097

Pulled By: mthrok

fbshipit-source-id: 78346d93b54fca2a19b28991c224324ef53221c9

Summary:
This commit fixes the issue with the recent Sphinx-Gallery update.
Also it pins the versions of Sphinx-related packages.

Before:

<img width="256" alt="Screen Shot 2022-08-17 at 10 02 23 PM" src="https://user-images.githubusercontent.com/855818/185140952-28f2d98a-b586-424c-a003-b69089f48eb9.png">

After:

https://user-images.githubusercontent.com/855818/185271889-bd4f86a0-986b-43bb-8121-bd77750d74f0.mov

Pull Request resolved: https://github.com/pytorch/audio/pull/2629

Reviewed By: carolineechen

Differential Revision: D38816417

Pulled By: mthrok

fbshipit-source-id: 11ee3f9121d9a302772ee1f461dacae52eb28852

Summary:
Resolves the following warning

```
/torchaudio/docs/source/transforms.rst:94: WARNING: Title underline too short.

:hidden:`Loudness`
-----------------
```

Pull Request resolved: https://github.com/pytorch/audio/pull/2627

Reviewed By: carolineechen

Differential Revision: D38814802

Pulled By: mthrok

fbshipit-source-id: 5dfaf2d7bae22dba0f4a14f04ca63f28d6b2a749