title: Cannot save graph made in Networkx and matplotlib
body: <p>I am using NetworkX and matplotlib to draw graph with png images as nodes. Here is my code:</p>
  
  <pre><code>import networkx as nx 
  import matplotlib.pyplot as plt 
  G = nx.DiGraph()
  
  #DRAWING EDGES ON AXIS 
  G.add_edges_from(([1,2],[3,4],[5,6],[7,8]))
  pos = nx.circular_layout(G)
  fig = plt.figure(figsize=(20, 20)) 
  ax = plt.axes([0, 0, 15, 15])
  ax.set_aspect('equal') 
  nx.draw_networkx_edges(G, pos, ax=ax, arrows=True)
  
  #TRANSFORMING COORDINATES 
  trans = ax.transData.transform 
  trans2 = fig.transFigure.inverted().transform 
  
  #PUTTING IMAGE INSTEAD OF NODES 
  size = 0.2 
  p2 = size / 2.0 
  
  for n in G:
     xx, yy = trans(pos[n]) 
     xa, ya = trans2((xx, yy)) 
     a = plt.axes([xa - p2, ya - p2, size, size])
     a.set_aspect('equal')
     a.imshow(image, aspect='auto')
     a.axis('off')
  
  plt.savefig('save.png') 
  plt.show()
  </code></pre>
  
  <p>Jupyter notebook displays graph. However, when I use Pycharm it shows blank white figure. Saving by plt.savefig() also do not works. I tried to play with dpi in plt.savefig() but doesn't change anything. Will be very grateful for any clues.</p>