If I understand your use case correctly, you only have the model definition in PyTorch with the state_dict, but the actual code to train the model is missing?
If that’s the case, I think it will be too painful to try to guess how the data was processed.
Do you have any information about the preprocessing or any other steps?
If not, I would rather use the model and retrain it on your data with your known preprocessing pipeline.
Once you have your desired accuracy, you could start to deploy it.