self.dataset has no key 'categories'

[Pinaki Nath Chowdhury]

is this code not updated for quite sometime? Also, can you suggest some good source with Python>=3.7 support?

I tried to run the given IPython file. But while loading I get KeyError. The annotation JSON file does not have the following keys: (a) type (b) categories.

Please let me know. Thanks !!