code: def check_train_begin_and_end(
      lines: List[str], **kwargs: Dict
  ) -> None:
      assert lines[0].startswith(
          train_begin
      ), "first call was not on_train_begin"
      assert lines[-1].startswith(
          train_end
      ), "last call was not on_train_end"
  
imports: import io
  from typing import Any, Callable, Dict, List, Optional, Set
  import determined
  import determined.keras
label_desc: Use image node_id 3 for calling a global function with example usage: check_train_begin_and_end(lines) without return types