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Annoy is a C++/Python package I built for fast approximate nearest neighbor search in high dimensional spaces. Spotify uses it a lot to find similar items. First, matrix factorization gives a low dimensional representation of each item (artist/album/track/user) so that every item is a k-dimensional vector, where k is typically 40-100. This is then loaded into an Annoy index for a number of things: fast similar items, personal music recommendations, etc. Annoy stands for Approximate Nearest Neig...