code: def postprocess_message(self, msg):
      assert (
          msg["type"] != "sample" or msg["name"] not in self.trace
      ), "sample sites must have unique names"
      self.trace[msg["name"]] = msg.copy()
  
imports: import random
  import warnings
  import weakref
  from collections import OrderedDict
  import numpy
  import torch
  from pyro.distributions import validation_enabled
label_desc: Use image node_id 2 for calling the trace obj's underlying member method code with example usage: obj.postprocess_message(msg) without return types