openset
nounUK /ˈəʊpən sɛt/
US /ˈoʊpən sɛt/
An open set is a group of points where every point has a little space around it that is still inside the group.
In topology class, the teacher showed that an open interval like (0, 1) is an open set.
OTHER MEANINGS
2. In tennis, an open set refers to a set played in a tournament that any qualified player may enter.
She signed up for the open set at the local club tournament.
3. In data science, an open set is a dataset where new, unseen categories can appear during testing.
The model struggled because the open set contained classes it had never seen before.
4. In music, an open set can mean a performance with no fixed seating or ticket restrictions.
The band played an open set at the park for anyone who wanted to listen.