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Apriori Algorithm – Lecture Notes

\(p\lt{}q\) , that match on their first \(k-2\) elements \(p \in F_{k-1}:\) ( 1 2  3) \(\downarrow\) ( 1 2  3 4) \(\in C_k\) \(\uparrow\) \(q \in F_{k-1}:\) ( 1 2  4) Step 2: Pruning Remove all candidate itemsets [...] itemsets. Need to check only the \(k-2\) itemsets not used in join. Example: \(F_3 = \{ (1~ 2~ 3), (1~ 2~ 4), (1~ 3~ 4), (1~ 3~ 5), (2~ 3~ 4)\}\) After join: \(\{ (1~ 2~ 3~ 4), (1~ 3~ 4~ 5)\}\) pruning step: [...] w\) \(C_2\) { A B } { A D } { A E } { B D } { B E } { D E } scan  \(D\) \(\longrightarrow\) \(C_2\) { A B } 7 { A D } 5 { A E } 4 { B D } 7 { B E } 6 { D E } 4 filter \(\longrightarrow\) \(F_2\) { A B …