code: def _predict(self, item):
      return {"x": item.x}
  
file_path: modelkit/tests/test_model_serialization.py
imports: import pickle
  import pydantic
  from modelkit.core.model import Model
label_desc: Use image node_id 1 for calling the SomeModel obj's underlying member method code with example usage: obj._predict(item) and returns: dict