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Summary:
Initial step to migrate to upstream CTC decoder.

https://circleci.com/api/v1.1/project/github/pytorch/audio/1174432/output/107/0?file=true&allocation-id=642636c6eaaa102ce75beb8e-0-build%2FB77C8AB

Pull Request resolved: https://github.com/pytorch/audio/pull/3225

Reviewed By: nateanl

Differential Revision: D44581338

Pulled By: mthrok

fbshipit-source-id: 1517fa0cd5e4ba001d136eb0dfc2a9349afcd2da

Summary:
In librosa 0.10 release, positional arguments are deprecated (see https://github.com/librosa/librosa/pull/1521 for details). The PR fixes the HiFiGAN unit test by using keyword arguments for `librosa.filters.mel` function.

Pull Request resolved: https://github.com/pytorch/audio/pull/3185

Reviewed By: mthrok

Differential Revision: D44218852

Pulled By: nateanl

fbshipit-source-id: 6171f7bec6a2144917697c1d640e701d95ec60d7

Summary:
This commit adds CUDA frame support to FilterGraph

It initializes and attaches CUDA frames context to FilterGraph,
so that CUDA frames can be processed in FilterGraph.

As a result, it enables
1. CUDA filter support such as `scale_cuda`
2. Properly retrieve the pixel format coming out of FilterGraph when
   CUDA HW acceleration is enabled. (currently it is reported as "cuda")

Resolves https://github.com/pytorch/audio/issues/3159

Pull Request resolved: https://github.com/pytorch/audio/pull/3183

Reviewed By: hwangjeff

Differential Revision: D44183722

Pulled By: mthrok

fbshipit-source-id: 522d21039c361ddfaa87fa89cf49c19d210ac62f

Summary:
Add GitHub Action-based GPU test jobs.
- It seems that there is 2 hour upper cap so only running CUDA/GPU tests.
- Since Kaldi related features are not available, they are disabled.

Pull Request resolved: https://github.com/pytorch/audio/pull/3029

Reviewed By: hwangjeff

Differential Revision: D42983800

Pulled By: mthrok

fbshipit-source-id: 47fefe39c635d1c73ad6799ddacefd2666fe5403