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I am now studying Gramian trick from this book : Recommendation systems handbook
However, I am having problem understanding its mechanism as well as its maths. I tried to look up the reference paper at [2] , but I got more confused.
Could anyone care to explain ?
>. You can use a tool like Mathpix Snipping Tool to quickly do it. Moreover, be more precise about what you understand and what you don't understand, and provide more context. $\endgroup$