code: def _check_connection(model):
      try:
          with torch.no_grad():
              model.eval()
              _ = model._get_values(model.input_prototype())
      except Exception:
          logger.error(
              "The networks aren't connecting to each other; check your networks"
          )
          raise
      finally:
          model.train()
  
imports: import logging
  from typing import List, Optional, Tuple
  import torch
  from reagent.core import types
  from reagent.core.tensorboardX import SummaryWriterContext
  from reagent.models.base import ModelBase
  from reagent.models.critic import FullyConnectedCritic
  from reagent.models.dqn import FullyConnectedDQN
label_desc: Use image node_id 2 for calling a global function with example usage: _check_connection(model) without return types