  DIHARD III was the third in a series of speaker diarization challenges
intended to improve the robustness of diarization systems to variability in
recording equipment, noise conditions, and conversational domain. Speaker
diarization was evaluated under two speech activity conditions (diarization
from a reference speech activity vs. diarization from scratch) and 11 diverse
domains. The domains span a range of recording conditions and interaction
types, including read audio-books, meeting speech, clinical interviews, web
videos, and, for the first time, conversational telephone speech. A total of 30
organizations (forming 21teams) from industry and academia submitted 499 valid
system outputs. The evaluation results indicate that speaker diarization has
improved markedly since DIHARD I, particularly for two-party interactions, but
that for many domains (e.g., web video) the problem remains far from solved.
