code: def __init__(self, model, guide, optim, loss):
      self.model = model
      self.guide = guide
      self.optim = optim
      self.loss = loss
  
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 SVI object  with example: obj = SVI(model, guide, optim, loss)