code: def src_graph(self):
      return self.onnx_graph
  
file_path: MMdnn/mmdnn/conversion/onnx/onnx_parser.py
imports: from mmdnn.conversion.common.DataStructure.parser import Parser
  from mmdnn.conversion.onnx.onnx_graph import ONNXGraph
label_desc: Use image node_id 1 for calling the ONNXParser obj's underlying member method code with example usage: obj.src_graph() and returns: self