| Title | Started by | Date created | Latest post | Posts |
| Welcome to the HID 2021 challenge! | JZMa | Mar 02, 2021 | 3 years, 1 month | 1 |
| Notes on submitting results | JZMa | Mar 17, 2021 | 3 years | 3 |
| Important notice about confirming team members | JZMa | Apr 06, 2021 | 3 years | 1 |
| We use the CASIA-B dataset to pre-train. | Haijunxiong | Apr 20, 2021 | 3 years | 1 |
| Notice about not being able to return scores after submission | JZMa | Apr 12, 2021 | 3 years | 2 |
| What's the difference between 1st and 2nd phase | yunfeng | Apr 10, 2021 | 3 years | 1 |
| What is shown in the table is not my best result | Haijunxiong | Mar 23, 2021 | 3 years, 1 month | 2 |