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Embeddings of the Conditional Distributions

In order to highlight the asymmetries in the distributions, Mitrovic et al. has introduced embeddings on the conditional distributions PYXP_{Y | X} and PXYP_{X | Y} instead of the joint distribution. This allows for distinguishing asymmetries along with building an embedding of the distribution. The proposed conditional embedding is based on the Gaussian kernel along with an α quantity that performs as conditioning: μk,M(PSj)={j=1njαj(y)km(,xj),j=1njαj(x)km(,yj)}mM\mu_{k,M}(P_{S_j}) = \{ \sum_{j=1}^{n_j} \alpha_j (y)k_m(\cdot , x_j), \sum_{j=1}^{n_j} \alpha_j (x) k_m(\cdot , y_j) \}_{m\in M} with α(y)=(L+nλI)1lyα ( y ) = ( L + nλ I )^{−1} l_y, L=[l(yi,yj)]i,j=1nL = [l(y_i, y_j)]_{i,j=1}^n, ly=[l(y1,y),,l(yn,y)]Tl_y = [ l ( y_1 , y ), …, l ( y_n , y )]^T , α()=[α1(),,αn()]Tα (⋅) = [ α_1 (⋅), …, α_n (⋅)]^T , regularization parameter λ , identity matrix II , and MM the set of parameters for the kernel kk .

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Updated 2020-07-28

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Data Science