code: def on_train_workload_begin(
      self,
      batches_trained: int,
      batches_requested: Optional[int],
      logs: Dict,
  ) -> None:
      print(
          f"{train_workload_begin}:{batches_trained}:{batches_requested}:{logs}",
          file=self.log,
      )
  
imports: import io
  from typing import Any, Callable, Dict, List, Optional, Set
  import determined
  import determined.keras
label_desc: Use image node_id 12 for calling the CBChecker obj's underlying member method code with example usage: obj.on_train_workload_begin(batches_trained, batches_requested, logs) without return types