_connected_by_alternating_paths(G, matching, targets)
An alternating path is a path in which every other edge is in the specified maximum matching (and the remaining edges in the path are not in the matching). An alternating path may have matched edges in the even positions or in the odd positions, as long as the edges alternate between 'matched' and 'unmatched'.
:None:None:`G` is an undirected bipartite NetworkX graph.
matching
is a dictionary representing a maximum matching in :None:None:`G`, as returned by, for example, maximum_matching
.
:None:None:`targets` is a set of vertices.
Returns the set of vertices that are connected to one of the target vertices by an alternating path in :None:None:`G` or are themselves a target.
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