Dear all,
I have started some experiments using the imagenet example in the pytorch examples distribution (branch 0.3.1). I downloaded and processed the data as instructed on
https://github.com/soumith/imagenet-multiGPU.torch 17 (unpacking the many folders inside ILSVRC2012_img_train.tar and running valprep.sh)
When training the model (e.g. AlexNet), a few times per epoch I will see warnings like:

(…) /pylocal/lib/python2.7/site-packages/PIL/TiffImagePlugin.py:756: UserWarning: Corrupt EXIF data.  Expecting to read 4 bytes but only got 0.
warnings.warn(str(msg))


(…) /pylocal/lib/python2.7/site-packages/PIL/TiffImagePlugin.py:739: UserWarning: Possibly corrupt EXIF data.  Expecting to read 2555904 bytes but only got 0. Skipping tag 0
" Skipping tag %s" % (size, len(data), tag))

Is this to be expected (i.e. some of the imagenet files just have bad EXIF data, and this shouldn’t interfere with training) ? Or does it suggest that my dataset is corrupt?
Thanks in advance.