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Separation Tree Refinement.
Input: A crude separation tree  c for  ; perfect conditional independence knowledge. |
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Output: A refined separation tree for . |
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| 1 | Construct an undirected independence subgraph over each node of c; |
| 2 | Combine the subgraphs into a global undirected independence graph ¯ whose edge set is the union of all edge sets of subgraphs; |
| 3 | Construct a junction tree of ¯. |
