Bugs in Jupyter Notebook app

[deysaikat95]

Multiple bugs have been reported previously in the Jupyter Notebook app, most prominently the jovyan artifact when python library tries to download and cache datasets.

Steps to reproduce:

1. Launch Jupyter Notebook from ondemand (tested on allspark version)
2. Write the following line of code:

from torchvision import models 
models.vgg16(pretrained=True)

Output:
PermissionError: [Errno 13] Permission denied: '/home/jovyan/.cache/torch'