t3f
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Project matmul complexity
Change the order of lhs and rhs einsums to (1, 2, 0, 3), 'aikd,sabc,bije,scjkf->sdef' and (1, 2, 0, 3), 'cikf,sdef,bije,sajkd->sabc'
and change the complexity to O(d R n r2 ry s + d R n r ry2 s + d R2 n2 r ry s) or O(d R2 n2 r ry s) given that both r and ry are < Rn
#166