def _build_batch_norm_params(batch_norm, is_training):
  """Build a dictionary of batch_norm params from config.

  Args:
    batch_norm: hyperparams_pb2.ConvHyperparams.batch_norm proto.
    is_training: Whether the models is in training mode.

  Returns:
    A dictionary containing batch_norm parameters.
  """
  batch_norm_params = {
      'decay': batch_norm.decay,
      'center': batch_norm.center,
      'scale': batch_norm.scale,
      'epsilon': batch_norm.epsilon,
      'is_training': is_training and batch_norm.train,
  }
  return batch_norm_params