semseg class labels

Hi , 
i found some scenes in few sequences that have class labels as 0. But in the paper/Github the classes are mentioned to be from 1 to 42. Is this something that we should handle while training? Please let us know .

<img width="293" alt="Screen Shot 2022-07-08 at 8 40 32 PM" src="https://user-images.githubusercontent.com/44398353/178085079-bba7bc9f-5856-4cf9-b718-b817c6522b34.png">

