Dockerfile installation of torch and torchvision from s3, replacing original versions.

[akinolawilson]

What did you find confusing?
In the Dockerfile.gpu, there is a point where torch and torchvision are uni-nstalled, to be replaced with the re-installed specialized version of both packages from:

• here (torch) ,and
• here torchvision

Around line 138, in the Dockerfile.

Describe how documentation can be improved
Why are these replaced? During image building, this process is time-consuming. What what happen if I removed these versions and kept the original?