code: def get_image_frame(self):
      return self.image_frame
  
file_path: BigDL/python/dllib/src/bigdl/dllib/feature/dataset/dataset.py
imports: import sys
  from bigdl.dllib.utils.common import JavaValue
  from bigdl.dllib.utils.common import callBigDlFunc
  from bigdl.dllib.utils.common import *
  from bigdl.dllib.feature.transform.vision.image import *
label_desc: Use image node_id 4 for calling the DataSet obj's underlying member method code with example usage: obj.get_image_frame() and returns: self