The dataset interface runs problem-free for a couple of epochs, then outputs this error:

urllib.error.HTTPError: HTTP Error 503: Service Unavailable

when running the line with scikit-image method for opening a URL:

im = np.array(io.imread(self.img_data[idx][‘coco_url’]))

I’m training a single class (‘toothbrush’), and the model has 2 labels, background+class. Toothbrush has label 80, so I change 80 to 1 when training. None of the errors I could relate to are reported, just this one.
EDIT: another error that pops up (same method):

ConnectionResetError: [Errno 104] Connection reset by peer