causaldag.classes.ancestral_graph.AncestralGraph.add_bidirected

AncestralGraph.add_bidirected(i: Hashable, j: Hashable)

Add a bidirected edge between nodes i and j.

Parameters:

• i – first endpoint of bidirected edge.
• j – second endpoint of bidirected edge.

Examples

>>> import causaldag as cd
>>> g = cd.AncestralGraph()
>>> g.add_bidirected(1, 2)
>>> g.bidirected
{frozenset({i, j})}