ImageNet model in Detectron

[unrue]

Dear Detctron2 users,

I'm bit confused about Detectron models in model zoo. According to the user guide:

https://github.com/facebookresearch/detectron2/blob/main/MODEL_ZOO.md

All COCO models are pretrained with coco2017, so having about 80 output classes. What about Imagenet models? Imagenet dataset has hundreds of output classes. So, using Detectron Imagenet pretrained models I have only 80 classes? How can I have 1000 and more output classes like Imagenet dataset?

And another little question, How can I see number of output classes in model zoo pretrained net? Thanks.