How to add a plug-in

[SmallGGgg]

I would like to ask: if I want to add some plug-in models on FairMOT, which py file should I add it in?
Thanks！
我想请教大佬：如果我想在FairMOT上加入一些插件模型，要在哪一个py文件中加入呢？
谢谢！