causaldag.classes.dag.DAG.parents_of

DAG.parents_of(nodes: Union[Hashable, Set[Hashable]]) → Set[Hashable]

Return all nodes that are parents of the node or set of nodes nodes.

Parameters:nodes – A node or set of nodes.

See also

children_of(), neighbors_of(), markov_blanket_of()

Examples

>>> import causaldag as cd
>>> g = cd.DAG(arcs={(1, 2), (2, 3)})
>>> g.parents_of(2)
{1}
>>> g.parents_of({2, 3})
{1, 2}