验证时某个label的miou一直是0

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这是我在使用PPLiteSeg-STDC2训练自定义数据时的日志，其中第三个label的IoU一直是0，查看了数据是有这个label，请问这是为什么呢
[2025/04/15 14:59:03] INFO: Start evaluating (total_samples: 5456, total_iters: 5456)...
5456/5456 [==============================] - 131s 24ms/step - batch_cost: 0.0239 - reader cost: 6.2117e-05
[2025/04/15 15:01:14] INFO: [EVAL] #Images: 5456 mIoU: 0.5057 Acc: 0.9739 Kappa: 0.9452 Dice: 0.6109
[2025/04/15 15:01:14] INFO: [EVAL] Class IoU:
[0.9802 0.4728 0. 0.4081 0.5102 0.3607 0.9458 0.1596 0.714 ]
[2025/04/15 15:01:14] INFO: [EVAL] Class Precision:
[0.9913 0.6917 0. 0.573 0.6131 0.7202 0.9684 0.8778 0.8431]
[2025/04/15 15:01:14] INFO: [EVAL] Class Recall:
[0.9888 0.5991 0. 0.5865 0.7525 0.4195 0.9759 0.1632 0.8234]
[2025/04/15 15:01:14] INFO: [EVAL] The model with the best validation mIoU (0.5057) was saved at iter 5500.
[2025/04/15 15:01:15] INFO: [TRAIN] epoch: 2, iter: 5510/20000,