Question about data partition: did you use validation data for selecting best models?

[LinWeizheDragon]

Dear authors,

Thank you for your wonderful work. I am writing to ask a question regarding the training/testing process of your code.
As far as I can see, after training, it seems that all test users are used for validation / picking up best models for reporting metrics. But as we know, validation data is normally isolated from test data for the purpose of testing model generalizability.
I wonder if this is a common practice, or I have missed some details in your code. Thank you!
Looking forward to your reply.