Python-graphviz_layout仅在从矩阵创建图形时才为“点”程序给出错误

Question

我正在尝试从一个numpy矩阵创建一个有向图。我正在测试不同的布局，并且对“点”程序有疑问。我的代码：

import networkx as nx
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import pygraphviz
import pydotplus
from networkx.drawing.nx_agraph import graphviz_layout
network = pd.read_csv('Network.csv')
G = nx.from_numpy_matrix(network.values, create_using=nx.DiGraph()) 
pos = graphviz_layout(G, prog='dot')
pos

出现以下错误：

---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
<ipython-input-9-f4647c8efaf6> in <module>()
----> 1 pos = graphviz_layout(G, prog='dot')
      2 pos

~/anaconda3/envs/brightway/lib/python3.6/site-packages/networkx/drawing/nx_agraph.py in graphviz_layout(G, prog, root, args)
    241 
    242     """
--> 243     return pygraphviz_layout(G, prog=prog, root=root, args=args)
    244 
    245 

~/anaconda3/envs/brightway/lib/python3.6/site-packages/networkx/drawing/nx_agraph.py in pygraphviz_layout(G, prog, root, args)
    276         args += "-Groot=%s" % root
    277     A = to_agraph(G)
--> 278     A.layout(prog=prog, args=args)
    279     node_pos = {}
    280     for n in G:

~/anaconda3/envs/brightway/lib/python3.6/site-packages/pygraphviz/agraph.py in layout(self, prog, args)
   1356         """
   1357         fmt = 'dot'
-> 1358         data = self._run_prog(prog, ' '.join([args, "-T", fmt]))
   1359         self.from_string(data)
   1360         self.has_layout = True

~/anaconda3/envs/brightway/lib/python3.6/site-packages/pygraphviz/agraph.py in _run_prog(self, prog, args)
   1333 
   1334         if not data:
-> 1335             raise IOError(b"".join(errors))
   1336 
   1337         if len(errors) > 0:

OSError: b''

但是，使用带有prog ='neato'或'twopi'的graphviz_layout可以正常工作。我正在Mac OS High Sierra上使用python 3.6.6版的Jupyter笔记本中工作。