code: def test_serialize():
      guide = PickleGuide(model)
      check_guide(guide)
  
      # Work around https://github.com/pytorch/pytorch/issues/27972
      with warnings.catch_warnings():
          warnings.filterwarnings("ignore", category=UserWarning)
          f = io.BytesIO()
          torch.save(guide, f)
          f.seek(0)
          actual = torch.load(f)
  
      assert type(actual) == type(guide)
      assert dir(actual) == dir(guide)
      check_guide(guide)
      check_guide(actual)
  
imports: import io
  import warnings
  import pytest
  import torch
  from torch.distributions import constraints
  import pyro
  import pyro.distributions
  from pyro.contrib.easyguide import EasyGuide, easy_guide
  from pyro.infer import SVI, Trace_ELBO
  from pyro.infer.autoguide.initialization import init_to_mean, init_to_median
  from pyro.optim import Adam
  from pyro.util import ignore_jit_warnings
label_desc: Use image node_id 4 for calling a global function with example usage: test_serialize() without return types