I don’t think that’s necessarily true. I don’t know much about machine learning, but I’m pretty sure a common technique is to use a model that is trained on a h

I don’t think that’s necessarily true. I don’t know much about machine learning, but I’m pretty sure a common technique is to use a model that is trained on a huge number of relevant data, and that model outputs a fingerprint of a given input, and the fingerprints of two inputs can be used to estimate the similarity of those two inputs.