few-shot方法 复现问题

[zzl777]

问题确认 Search before asking

• [X] 我已经查询历史issue，没有发现相似的bug。I have searched the issues and found no similar bug report.

Bug组件 Bug Component

Training

Bug描述 Describe the Bug

用pcb数据集复现对比学习的few-shot方法，PaddleDetection-release-2.6.1/ppdet/modeling/losses/supcontrast.py里positive_mask.sum()值异常，无法训练

复现环境 Environment

Linux paddle2.3.1

Bug描述确认 Bug description confirmation

• [X] 我确认已经提供了Bug复现步骤、代码改动说明、以及环境信息，确认问题是可以复现的。I confirm that the bug replication steps, code change instructions, and environment information have been provided, and the problem can be reproduced.

是否愿意提交PR？ Are you willing to submit a PR?

• [X] 我愿意提交PR！I'd like to help by submitting a PR!