code: def __init__(
      self,
      epochs: Optional[int] = None,
      validations: Optional[int] = None,
  ) -> None:
      super().__init__()
      self.log = io.StringIO()
      self.epochs = epochs
      self.validations = validations
  
imports: import io
  from typing import Any, Callable, Dict, List, Optional, Set
  import determined
  import determined.keras
label_desc: Use image node_id 1 to create a new CBChecker object from inherited base classes: det.keras.callbacks with example: obj = CBChecker(epochs, validations)