[feature] Drum Transcription: add num_threads and parallel_workers for madmom beat extraction
#111
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When running
omnizart drum transcribe <audio file>on drum transcription benchmark datasets (e.g. IDMT), I frequently face the issue which the program hangs after printing "Extracting feature...".A deeper dive points me towards the parallelism at
MadmomBeatTracking.processmight overload the CPU cores. Hence I might suggest to introduce thenum_threadsandparallel_workersoptional parameters for users to choose whether to run this part with / without parallelism.