None testing mIOU

[razvancaramalau]

When testing the semantic segmentation even the pre-trained models (drn_d_20), I obtain None as the mIOU. When I set up the gt=True, I obtained from 19 only one class with ~52-64 mIOU and the rest around 0 or Nan on the Cityscape dataset.
When I train my own model, it is the same. Does anyone know a fix for this?

Thanks!

[parthkvv]

@razvancaramalau did you find the solution? I am facing a similar error.