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from numpy import zeros, dot, diag, tensordot
from numpy.random import random
n = 6
m = 4
b = random((n, m))
d = random((m, m))
 
bdb = zeros(n, 'd')
for i in xrange(n):
bdb[i] = dot(b[i,:], dot(d, b[i, :]))
 
print bdb
bd = dot(b, d)
bdb = diag(dot(bd, b.T))
print bdb
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