While doing something else, I noticed that I managed to load an old pytorch model by loading the weights and updating the state dicts by doing model.load_state_dict(new_weights). I’m guessing those warning are coming from fastai that must pickle the model object. I’m guessing that I should be able to update my old model by creating a new model on pytorch 1.1 and loading the weights from the old model. Then I’ll create a new Learner object in fastai and I’ll save that new Learner. I’ll let you know how it goes.