But the accompanying XY plot showed samples that overlapped or at least were ambiguous. I immediately lost a lot of my interest in their approach, because traffic lights by design are very clearly red, or green. There aren't mauve or taupe lights that the local populace laughs at and says, "yes, that's mostly red."
I like the idea of studying math by using ML examples. I'm guessing this is a first step and future education will have better examples to learn from.