Many datasets will not download

[itamblyn]

Tested on two different machines (Windows 10 and OS X 12.2.1 Intel) on the same network.

Datasets which fail to download / load:

Caltech101
Caltech256
Cityscapes
CocoCaptions (pop-up mentions a parameter with no value, annFile)
CocoDetection (pop-up mentions a parameter with no value, annFile)
EMNIST <-- this does not have a default for split, and download is not set to true by default). So the dataset can be downloaded and loaded, but some better defaults would be more helpful here.

I won't go through the full list, but you get the idea.

[divideconcept]

Can you copy the exact error message ?

[divideconcept]

Nevermind I can repro the issues.
Caltech datasets seems to be a torchvision/caltech server issue though.
I'll see if something can be done for the others.