Unable to run IPSEP mode.
I am unable to run mode="ipsep". The code runs fine with mode="hier"
/venv/lib/python3.4/site-packages/pygraphviz/agraph.py:1334: RuntimeWarning: Warning: Illegal value ipsep for attribute "mode" in graph () - ignored
Here are the graph attributes that I am using:
graph [layout=neato, levelsgap=0.1, mode=ipsep ];