code: def __init__(self, fn, size, dim):
      assert dim < 0
      self.size = size
      self.dim = dim
      super().__init__(fn)
  
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 1 to create a new PlateMessenger object from inherited base classes: Messenger with example: obj = PlateMessenger(fn, size, dim)