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Setting `persistent_workers=True` when creating DataLoader removes a significant overhead at the start of each epoch and validation.
Yesno recipe
This is the simplest ASR recipe in icefall.
It can be run on CPU and takes less than 30 seconds to get the following WER:
[test_set] %WER 0.42% [1 / 240, 0 ins, 1 del, 0 sub ]
Please refer to https://icefall.readthedocs.io/en/latest/recipes/Non-streaming-ASR/yesno/index.html for detailed instructions.