code: def __init__(self, fn):
      self.fn = fn
  
file_path: pytorch/test/onnx/pytorch_helper.py
imports: import io
  import onnx
  import torch.onnx
  from caffe2.python.core import BlobReference, Net
  from caffe2.python.onnx.backend import Caffe2Backend
label_desc: Use image node_id 1 to create a new _FakeDict object  with example: obj = _FakeDict(fn)