The result of Segformer-b5 on Cityscapes

[cht619]

checkpoint: segformer.b5.1024x1024.city.160k.pth
CS-val:
+--------+-------+-------+-------+
| Scope | mIoU | mAcc | aAcc |
+--------+-------+-------+-------+
| global | 82.39 | 89.24 | 96.73 |
+--------+-------+-------+-------+

CS-test:
+--------+------+------+------+
| Scope | mIoU | mAcc | aAcc |
+--------+------+------+------+
| global | nan | nan | nan |
+--------+------+------+------+

CS-train:

+--------+-------+-------+-------+
| Scope | mIoU | mAcc | aAcc |
+--------+-------+-------+-------+
| global | 92.38 | 96.13 | 98.54 |
+--------+-------+-------+-------+
is that correct? Especially the test data