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What does this PR do?
This updates KsponSpeech recipe according to the recent changes in Speechbrain.
Not only conformer-medium model is updated, this PR includes new models, such as conformer-small, branchformer-medium, which can serve as new benchmarks for the dataset and models.
Tokenizers and transformer language model used previously trained ones.
Other updates include metadata build script using multiprocessing, and unzip script that follows recent KsponSpeech directory structure updates.
These are all CTC-Attention models, and training process of conformer-transducer model is underway for streaming cases.
We are consistently seeing the demand for KsponSpeech models from the community, as can be seen in issues and model downloads from the huggingface hub.
I believe the continuous updates of the KsponSpeech models will benefit the research community and the industry as a whole.
There are several other things that should be accomplished before this PR is completed.
Before submitting
PR review
Reviewer checklist