gan_generate issue

[priyamayur]

I tried to run gan_generate directly to get generations from a trained model. However I get an error : NameError: name 'difformer' is not defined
from this line: "self.diff = difformer.DIFFormer(embedding_dim, hidden_dim, out_channels=128, use_graph=False)"

Is difformer a python module we need to run this?