Powerset multi-class cross entropy loss for neural speaker diarization

Benchmark Model Rank Results
speaker-diarization-on-ami-ihm-diarization-testPowerset (domain-adapted)#1DER: 18.0
speaker-diarization-on-msdwild-few-val-audio-diarizationPowerset (domain-adapted)#3DER: 28.5
speaker-diarization-on-voxconverse-v0-3-test-zero-collarPowerset (domain-adapted)#3DER: 10.4
speaker-diarization-on-alimeeting-far-diarization-testPowerset (compound training)#6DER: 23.3
speaker-diarization-on-ami-sdm-diarization-testPowerset (compound training)#6DER: 22.0
speaker-diarization-on-dihard-iii-full-eval-system-sadPowerset (domain-adapted)#6DER: 21.3