code: def __call__(self, site):
      if self._init is None or site["name"] in self._seen:
          self._init = self.generate()
          self._seen = {site["name"]}
      return self._init(site)
  
imports: import functools
  from typing import Callable, Optional
  import torch
  from torch.distributions import transform_to
  from pyro.distributions.torch import Independent
  from pyro.distributions.torch_distribution import MaskedDistribution
  from pyro.infer.util import is_validation_enabled
  from pyro.poutine.messenger import Messenger
  from pyro.util import torch_isnan
  from .utils import helpful_support_errors
label_desc: Use image node_id 2 for calling the _InitToGenerated obj's underlying member method code with example usage: obj.__call__(site) and returns: self