I use this repo to train my own dataset, single class.
I got this result:

is it logical?
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@hktxt is the class of your data include in coco? seem like it's over fitting, maybe just need few epoch and lower learning rate
@hktxt you get 0.94 [email protected]. You can use best.pt and call it a day, or you can experiment alternatives like @yxNONG mentions.