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MLS English recipe #1919

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This is a recipe for the English-only subset (~44.5k hours) of the Multilingual LibriSpeech dataset available here. The data archives were restructured from the original ones from OpenSLR to make it easier to stream, which is why this new version differs from the existing recipe made in this open PR.

Currently it only supports on-the-fly feature computation (see this issue on lhotse for background), but we may change this depending on feedback.

Only non-streaming (--causal 0) zipformer model training has been tested so far.

Some files may be left over from the egs/reazonspeech recipe that I adapted this recipe from.

This is my first time contributing a recipe for a new dataset, so please let me know if there are any suggestions for changes or other feedback!

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