Issue with dataBlock on Colab

data = ImageDataBunch.from_name_re(path_img, fnames, pat, valid_pct=0.2,size=(32, 128), bs=32).normalize(imagenet_stats)

/usr/local/lib/python3.7/dist-packages/fastai/data_block.py:541: UserWarning: You are labelling your items with CategoryList.
Your valid set contained the following unknown labels, the corresponding items have been discarded.
toɓɓere, faddorde, fooɗde, dabbude, pooɗgol…
if getattr(ds, ‘warn’, False): warn(ds.warn)