Writing a gradient tutorial, focused on leaf vs non leaf tensors.

[JitheshPavan]

There is no tutorial that specifically talks about requires_grad, retain_grad, and leaf tensor/ non-leaf tensors and how they interact with each other. Can I write a tutorial specifically talking about this topic? This will be useful when gradients are used in unusual places, as is the case for the deep dream algorithm.

cc: @albanD

[albanD]

I think https://pytorch.org/docs/stable/notes/autograd.html#locally-disabling-gradient-computation contains the most in-depth discussion of this topic. I'm sure we could expand on it in a tutorial if there are enough questions we want to cover.
cc @soulitzer