How to use custom dataset instead of coco?

[itisitis]

With coco dataset I can run the code. Now i want to use a custom dataset with just 3 classes?
What would be best approach to replace coco and integrate custom weights?

Any help would be appreciated- Thanks.

[LightningZeus123]

I was trying to run the code, but couldn't make heads or tails of how to resolve some errors. As you might have guessed, I am new to git and github and would very much appreciate any help.
Thanks.