On Google Colab, I built a notebook on my own image set using the dog breed notebook example. When I ran learn = ConvLearner.pretrained(arch, data, precompute=True) , I got the above mentioned error (also attached).
One of potential reasons could be that I did not download the weights.tgz file (everything else was done precisely as instructed), so I went looking for it, but it seems to be missing from github (appears like empty drive where it used to be) and http address. Curl in Terminal failed to connect and !wget -O fastai/weights.tgz http://files.fast.ai/models/weights.tgz on Colab got back with “no such file or directory”.
Not sure if the two issues are connected - any advice much appreciated.