Sorry for the late reply.
For the first error, can you check the type(model) is torch.nn.Module instead of collections.OrderedDict ?
As for the second error, there are commonly two ways of saving/loading models in PyTorch.
One is save/load state_dict and the other is save/load the entire model. In your codes, you’re saving the entire model with torch.save(net, ...), however load it in state_dict way:
# WRONG. load state_dict, not match with entirely saving model. 
model.load_state_dict(torch.load(“checkpoint/modelFULL_0.pth”))
# CORRECT. Instead, you should load entire model
model = torch.load(“checkpoint/modelFULL_0.pth”)

Here for more details Saving and Loading Models — PyTorch Tutorials 1.9.0+cu102 documentation