Marginalization.

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The marginal distribution of a subset $A \subset V$ is given as follows:

$\begin{displaymath} Q_A(x_A)\;=\;\sum_{k=1}^m \lambda_k T^k_A( x_A). \end{displaymath}$

Hence, the marginal of

is a mixture of the marginals of the component trees.

Journal of Machine Learning Research 2000-10-19