Himalayan Salt Bath

This is mostly a bug, documentation, and installation fix release.

New features

Add dynamic LRU cache for audio and feature I/O (#443)

Lhotse will now cache up to 512 audio/feature arrays that were read from disk to speed-up some common usage patterns.
This behavior can be easily disabled with lhotse.set_caching_enabled(False).

Recipe improvements

• Update timit recipe by @luomingshuang in #446
• Fixes to babel recipe by @jtrmal in #447
• Fixed bug in preparing AMI supervisions by @desh2608 in #449

General improvements

• add export multichannel to kaldi by @jtrmal in #441
• Fix documentation builds by @pzelasko in #448
• fix typo of np.stack by @glynpu in #450
• Rich exception info for I/O in Recording, MonoCut and MixedCut by @pzelasko in #454
• Fix SpecAugment docs by @pzelasko in #463
• Fix misleading manifest format in the comments by @stachu86 in #460
• Ensure the users who installed PyTorch also install torchaudio themselves by @pzelasko in #466
• Add documentation and tests for Kaldi feature extraction layers by @pzelasko in #467

New Contributors

• @glynpu made their first contribution in #450
• @stachu86 made their first contribution in #460