code: def _external_value_resolution_pass(cls, model, raw_values_dict):
      for init in model.graph.initializer:
          cls._substitute_raw_value(init, raw_values_dict)
  
      cls._visit_and_substitute_raw_values(
          model.graph.node, raw_values_dict
      )
  
imports: import collections
  import sys
  import zipfile
  import itertools
  import onnx.backend
  from caffe2.python import core, workspace, rnn_cell, gru_cell
  from caffe2.python.model_helper import ModelHelper
  from caffe2.proto import caffe2_pb2
  import caffe2.python.utils
  import numpy
  import onnx
  from onnx import TensorProto
  import onnx.numpy_helper
  import onnx.defs
  import onnx.shape_inference
  import onnx.utils
  from onnx.backend.base import Backend, Device, DeviceType, namedtupledict
  from caffe2.python.onnx.workspace import Workspace
  from caffe2.python.onnx.backend_rep import Caffe2Rep
  import caffe2.python._import_c_extension
  import warnings
label_desc: Use image node_id 13 for calling the Caffe2Backend obj's underlying member method code with example usage: obj._external_value_resolution_pass(cls, model, raw_values_dict) without return types