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SUMMA Algorithm
•A column broadcast is simply a column flood and similarly for row broadcast is a row flood
•Define variables
–
–var   Col : [1..m,*] double; -- Col flood array
–      Row : [*,1..p] double; -- Row flood array
–        A : [1..m,1..n] double;
–        B : [1..n,1..p] double;
–        C : [1..m,1..p] double;