关于训练过程F1的疑问

[WesternTrail]

I used the BIT script in paddlers to train the LEVIR-CD+dataset, which was pre divided into 512x512 patches. During the training process, I found that the F1 index was very low. May I ask if everyone's training process is also so slow? I have trained nearly 100 epochs, and the F1 index is only 0.2..