| http://www.w3.org/ns/prov#value | - An attribute k is considered relevant to the points in leaf node i if in any node on the path from the root node to the leaf node, one of the following 3 conditions is met: (1) attribute k appears in the univariate test that splits the node; or (2) attribute k appears in the distance function test with a non-zero weight that splits the node; or (3) attribute k does not appear in any tests, but the
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