Recommender System

Consider a table with $4$ user ratings on $8$ items as shown below.

$\backslash$table$[[$userID$/$game$,$WatchDog,GTAV,PUBG,StarCraft,CallofDuty,FIFA,WoW,MineCraft$],[$firechicken$,3,3,4,,4,2,3,],[$mike$0702,3,5,4,3,3,,4,],[$zephyros$,,4,,5,,4,4,5],[$dadvador$,2,,,4,,4,1,]]$

Treating the utility matrix as boolean $($buy or not buy$),$ compute the Cosine distance between zephyros and dadvador. Please answer to three decimal places.

Note: It is possible to solve this question mathematicalf, but it may be easier to solve this question programmatically.

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