What's the difference between last.pt&best.pt, and which one should i use when i test my custom data?

Created by: PromiseXu1

I have tried your work of yolov3 on my custom data, and when i train on yolov5 i find that yolov5 is more excellent! I just train for 100 epochs, the map50 have reached at 80! And i will train more epochs to see if it could be better .

But the question is that when i finish the train, and start to test, which weight.pt should i choose? And what's the difference between last.pt and best.pt?

Could you help me? Thanks sincerely.