some bug in code

[Zhonny]

1 . change all_edge_idx = range(edges.shape[0]) to all_edge_idx = list(range(edges.shape[0])) in preprocessing.py 2 . change objects.append(pkl.load(open("data/ind.{}.{}".format(dataset, names[i])))) to objects.append(pkl.load(open("data/ind.{}.{}".format(dataset, names[i]),'rb'),encoding='latin1')) in input_data.py