Optional. The instance of the object,
expressed as a positive integer. Used to tell
apart objects of the same type (i.e.
AnnotationSpec) when multiple are present on a
NOTE: Instance ID prediction quality is not a
part of model evaluation and is done as best
effort. Especially in cases when an entity goes
off-screen for a longer time (minutes), when it
comes back it may be given a new instance ID.
Required. A time (frame) of a video to which
this annotation pertains. Represented as the
duration since the video's start.
Output only. The confidence that this annotation is positive
for the video at the time_offset, value in [0, 1], higher
means higher positivity confidence. For annotations created
by the user the score is 1. When user approves an
annotation, the original float score is kept (and not
changed to 1).