Found myself wondering about an interesting philosophical problem with some of the assumptions of machine learning, which led me to an interesting philosophy stackexchange thread: https://philosophy.stackexchange.com/questions/40581/on-wittgensteins-family-resemblance-and-machine-learning
My line of thought is that a Russellian theory of meaning is kind of baked into the idea of a classification problem, and that class membership of real world things doesn't always behave as discretely as Russell would have liked.