Learner object doesn't load the datasets correctly

Hi, my learner object seems to be doing something weird while trying to load the dataset. The notebook linked here shows the issue in an amount of detail that I can’t replicate here.

The issue seems to be that the validation dataset is not created correctly and the images are somehow read as strings. I know this doesn’t happen when creating the ImageDataBunch but only after I try running learn.lr_find() (this is all documented in the notebook).

What’s stranger is that only yesterday when I was running the exact same code, everything ran smoothly. I can’t understand what causes the issue here.

PS – I also did conda update --all but to no avail.