˜K1S ∈R M×M and ˜K2S ∈R M×M are the Gram matrices associated with ˜k1S and ˜k2S, defined by( ˜K1S)ij = ˜k1S(vx1S ,i,v x1S ,j)and( ˜K2S)ij = ˜k2S(vx2S ,i,v x2S ,j)

−µ X1|XS(x′ S)⟩, ˜k2S(x2S, x′ 2S) = ⟨φ2(x2)−µ X2|XS(xS), φ2(x′ 2)−µ X2|XS(x′ S)⟩,we can computeTM CI as Y ushi Hirose, Akito Narahara, T akafumi Kanamori TM CI = tr(( ˜K1S ⊙K S)Dα∗ ˜K2SDα∗) where ⊙ denotes the Hadamard product · 2011