>What are those? Root of sum of squares? Why? I see what you mean. Probably can be argued that learning and applying a specific concept doesn't necessarily imp

>What are those? Root of sum of squares? Why? I see what you mean. Probably can be argued that learning and applying a specific concept doesn't necessarily imply learning the deeper mathematics behind it and understanding its nature. So can just say cosine similarity measures the similarity of two vectors (lists in python) and its implementation is that sum divided by the product of sqrts of those two other sums without having to introduce and explain dot product and norm. Of course the reverse can be argued too.