Train an existing Model category id question

[tiusty]

Hi,

I am looking to add training to a model in the model zoo specifically a PanopticFPN model

I have a few doubts regarding the category section.

I assume if the model was already trained with COCO then certain categories are already defined. Looking at the prepare_panoptic_fpn it imports COCO_CATEGORIES which defines ids for about 200 different items.

Therefore in my annotations if I want to extend the existing model with a new class then I should set that object id to 201? Or does it matter?

When I train does it remember the old category ids and thus if I train with category 1 the training will enhance the already trained category for number 1? Or will it treat category 1 as a new category?

Thanks!