📋 Originally created by @fwilliams

Original author: @fwilliams
Date: 2025-01-14T21:28:41Z

We're using torch_scatter in unit tests which is causing problems with the new conda environment in #121

It's being used by the JaggedTensor tests as ground truth. Instead, let's generate some correct test data and test against that so we can remove the dependency.

It's also being used int he NKFW tests which we'll delete.