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Returns transitive reduction of a directed graph

The transitive reduction of G = (V,E) is a graph G- = (V,E-) such that for all v,w in V there is an edge (v,w) in E- if and only if (v,w) is in E and there is no path from v to w in G with length greater than 1.

Parameters:G (NetworkX DiGraph) – A directed acyclic graph (DAG)
Returns:The transitive reduction of G
Return type:NetworkX DiGraph
Raises:NetworkXError – If G is not a directed acyclic graph (DAG) transitive reduction is not uniquely defined and a NetworkXError exception is raised.