graphical_models.classes.dags.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

>>> from graphical_models import DAG
>>> g = DAG(arcs={(1, 2), (2, 3)})
>>> g.parents_of(2)
{1}
>>> g.parents_of({2, 3})
{1, 2}