In my own dataset, why is the Avg precision always 0.5 in each epoch?

[1244547821]

Hi yuan, in my own two-category data set training, the Avg precision in each epoch is 0.5, Recall is always 1, can you answer my question, the following is my result.
start validation
acc: 0.934211
AUC: 0.981920
Avg Precision: 0.500000
Avg Recall: 1.000000
d_prime: 2.962967
train_loss: 0.260971
valid_loss: 0.466797
validation finished
Epoch-2 lr: 1e-05

[YuanGongND]

Have you tried other baselines? It seems the model is biased to one class (i.e., predict all samples as that class), which could be due to the model is not well-trained, or the data has some problem.