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