STL dataset returns test fold if fold is misspecified #447
Description
If you miss-spell, or otherwise pass an invalid fold to the STL dataset it will set the data and labels to that of the test set.
Can be seen here:
vision/torchvision/datasets/stl10.py
Line 75 in fa377c4
Other datasets appear to raise a ValueError in their constructor when passed an invalid fold:
vision/torchvision/datasets/mnist.py
Line 202 in fa377c4
Would be good to do so for STL-10 also.