code: def default_z_pres_prior_p(t):
      return 0.5
  
imports: from collections import namedtuple
  import torch
  import torch.nn
  import torch.nn.functional
  from modules import MLP, Decoder, Encoder, Identity, Predict
  import pyro
  import pyro.distributions
label_desc: Use image node_id 1 for calling a global function with example usage: default_z_pres_prior_p(t) and returns: int