code: def data_format(self) -> str:
      if self._data_format is None:
          raise AttributeError(  # AttributeError -> hasattr returns False
              "please specify data_format when initializing the JaxModel"
          )
      return self._data_format
  
imports: from typing import Any, Optional
  import eagerpy
  from ..types import BoundsInput, Preprocessing
  from .base import ModelWithPreprocessing
label_desc: Use image node_id 2 for calling the JAXModel obj's underlying member method code with example usage: obj.data_format() and returns: self