The dscore scoring tool computes diarization error rate with a collar of 0 milliseconds by default and counts regions of overlapping speech.

Checked against its source on October 17, 2026

In the source's own words

“with a default collar size of 0 ms and explicitly including regions that contain overlapping speech in the reference diarization”

dscore: scoring tool for speaker diarization (README), Neville Ryant, GitHub, n.d., Section on DER scoring.

What it measures: A reader comparing two DER figures should first check the collar and overlap settings, because they change the number.
What it does not show: Software default, not a standard. Papers may set other values, and the README describes this one tool only.