update contraction tutorials

[mganahl]

We now also have Glen's contractor. We should add a tutorial for that

[chaserileyroberts]

I would actually love to add a wrapper around glen's code that automatically optimizes the contraction order. Maybe tn.ncon_optimized(...)?

[chaserileyroberts]

Tooling is all there, this would just be an API addition.

[adarshiremath]

Hi Guys I see the issue is still open, can I work on it, but I'm actually new to open source. It would be really grateful if someone could help me out with it.

[mganahl]

Hi, and sorry for the late reply! Basically, we need a tutorial that explains how to use the different methods for finding a contraction path of a network. You can either write a small colab notebook, and we'll link to it on the main page, or you can write a .rst file and we'll add it to the documentation.

A simple notebook could just initialize a few nodes, connect them and then use the tn.contractors module to find the optimal contration path (similarly, using the ncon API). The code is all in tn.contractors/opt_einsum_paths and tn.contractors/custom_path_solvers.

[BitGeek29]

Hi, I see the issue is still open, can I work on it.

[Mahas1234]

Are there any more fixes needed. I'm looking for first contribution.