Hello everyone!
I am trying to finetune one model (U-net architecture) for segmentation, which is trained on CityScapes, by using data from Mapillary Vistas. However, vistas have more classes then cityscapes. So,  I translated classes from vistas to cityscapes classes by myself.
After that I started training and saw this warning: WARNING:root:NaN or Inf found in input tensor. I don’t understand how this appears. I hope, someone can help me 
Code of model I use: https://github.com/PingoLH/FCHarDNet 3