When evaluating with map/ap, result is all 0

[zf6578]

Prerequisite

• [X] I have searched Issues and Discussions but cannot get the expected help.
• [X] The bug has not been fixed in the latest version(https://github.com/open-mmlab/mmpose).

Environment

hi, when i evaluating my model with metric map/ap , it comes: The overall loss function is decreasing, acc_pose is increasing, but map remains at 0 Then I visualized the results of the model inference and found that the results were still good. So, where did the problem lie

Reproduces the problem - code sample

python train.py

Reproduces the problem - command or script

python train.py

Reproduces the problem - error message

Additional information

No response