Load model if present at the specified path.

def maybe_load_model(savedir, container):
  """Load model if present at the specified path."""
  if savedir is None:
    return

  state_path = os.path.join(os.path.join(savedir, 'training_state.pkl.zip'))
  if container is not None:
    logger.log("Attempting to download model from Azure")
    found_model = container.get(savedir, 'training_state.pkl.zip')
  else:
    found_model = os.path.exists(state_path)
  if found_model:
    state = pickle_load(state_path, compression=True)
    model_dir = "model-{}".format(state["num_iters"])
    if container is not None:
      container.get(savedir, model_dir)
    U.load_state(os.path.join(savedir, model_dir, "saved"))
    logger.log("Loaded models checkpoint at {} iterations".format(
        state["num_iters"]))
    return state