We thank all reviewers for the constructive comments and are glad to see overall positive reviews toward this work

We thank all reviewers for the constructive comments and are glad to see overall positive reviews toward this work. Response to R1: Thank you for acknowledging contributions of our work and offering helpful suggestions. The symmetric trick is an intuitive way, while our Eq.(1) is more interpretable and can degenerate to the It ignores the directed structure and may lead to degenerated performance. Thus, transition matrix is used to find directly connected neighbors. Thank you for invaluable feedback. We chose a three layer model and set it hidden dimension to 32.