class_docstr: ONNX backend model factory 
class_docstr_tok: ["ONNX","backend","model","factory"]
code: def open(self, model):  # pylint: disable=missing-function-docstring
      return _Model(model)
  
imports: import collections
  import enum
  import json
  import os
label_desc: Use image node_id 1 for calling the ModelFactory obj's underlying member method code with example usage: obj.open(model) and returns: _Model