There is a project called SamplesUtils sitting inside the core ML.NET codebase. I believe this was created before the [BestFriend] concept came around.

This project contains one namespace, SampleDatasetUtils that has one static class, DatasetUtils. Here are the following issues:

1. Everything is public and nothing is sealed.
2. This was built for Samples, but now Tests have taken a dependence on a couple of methods.
3. The file itself has no organization, everything is everywhere.