After applying pruning to the layers of a model, by iterating over all modules and applying:
prune.l1_unstructured(layer, name='weight', amount=0.1)
prune.l1_unstructured(layer, name='bias', amount=0.1)

to nn.Linear modules.
I get the error RuntimeError: Only Tensors created explicitly by the user (graph leaves) support the deepcopy protocol at the moment, when trying to deepcopy my nn.Sequential model, or rather, an object containing said nn.Sequential model.