Librispeech ctc recipe

[huangruizhe]

Added a Librispeech ctc recipe for demonstration purpose.

• This recipe demonstrates using either torch.nn.CTCLoss or k2.ctc_loss. Both can converge to similar results.
• It supports using either CTC or HMM topology with k2.ctc_loss.
• It currently uses a greedy decoder for decoding.

WER results will be posted later.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/audio/3541

• 📄 Preview Python docs built from this PR

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❌ 11 New Failures

As of commit 54fdc28:

NEW FAILURES - The following jobs have failed:

• build (3.10, 11.8) / Build doc (gh)
• build (3.8) (gh)
• tests (3.10, 11.8) / linux-job (gh)
• tests (3.10) / linux-job (gh)
• tests (3.8, 11.8) / linux-job (gh)
• tests (3.8) / linux-job (gh)
• tests (3.9, 11.8) / linux-job (gh)
• tests (3.9) / linux-job (gh)
• tests / macos-job (gh)
• unittests-windows-cpu / windows-job (gh)
• unittests-windows-gpu / windows-job (gh)

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