message: Annotate type to satisfy mypy
diff: import time
  +from typing import List, Optional, Tuple
  from absl import app, logging
  @@ -98,7 +99,7 @@ def _run_unitary_versus_federated(name: str, xy_splits, xy_val, xy_test, C):
  # Plot results
  # TODO include aggregated participant histories in plot
  - plot_data = [
  + plot_data: List[Tuple[str, List[float], Optional[List[int]]]] = [
  (
  "Unitary Learning",
  ul_hist["val_acc"],
  