about the testing data

[zhangbiwu]

Hello, When I was reading this paper"Attention-aware contrastive learning for predicting T cell receptor–antigen binding specificity", I found that the dataset involved in the paper came from your paper. But half of the 619 test cases described in the paper were positive and half were negative.
So, may I ask if all 619 test cases in the test set are positive? Or is it half positive and half negative? thanks