code: def _extract_model_inputs(self):
      return [self._to_zoo_input(oi) for oi in self._input_list]
  
file_path: analytics-zoo/pyzoo/zoo/pipeline/api/onnx/mapper/reducemean.py
imports: from zoo.pipeline.api.onnx.mapper.operator_mapper import OperatorMapper
  import zoo.pipeline.api.autograd
  from zoo.pipeline.api.onnx.onnx_helper import OnnxHelper
  import zoo.pipeline.api.keras.layers
label_desc: Use image node_id 2 for calling the ReduceMeanMapper obj's underlying member method code with example usage: obj._extract_model_inputs() and returns: unknown