'Graph' object has no attribute 'edge'

[dcp15]

(python2) douzp@gpu75:~/science_rcn/science_rcn$ python run.py
INFO:main:Training on 20 images...
Traceback (most recent call last):
File "run.py", line 230, in
parallel=options.parallel)
File "run.py", line 83, in run_experiment
train_results = pool.map_async(train_partial, [d[0] for d in train_data]).get(9999999)
File "/home/douzp/anaconda3/envs/python2/lib/python2.7/multiprocessing/pool.py", line 572, in get
raise self._value
AttributeError: 'Graph' object has no attribute 'edge'