Block Matrice Multiplication
notes for myself
suppose you wanna do C= AB
the grid shape of A if is m x n then of B should be n x p
the grid shape of C would be m x p
and block of C
\(C_{ij} = \sum_{n} A_{in} B_{nj}
\)
Ain is a block. think of it like treating blocks as numbers and calculating as we generally calculate numbers in matrix multiplication
very very important :-
The shapes of blocks of A and B must be of the form m x p & p x n. they need not to be identical.