Instance id naming rules

Hi there,

I want to extract a group of specific semantic classes for a bunch of instance GT data, including images and instance gt files. But Instance Name in Semantics Schema Editor is something like, Semantics_03au. It seems that id recorded in .npy is a int, say, 1, 2, 3, 4.

How Instance Name related to the instance id? What’s naming rules for instance id?