class_docstr: Callback interface with several methods that are called at different stages of the optimization process.
code: def __init__(self) -> None:
      pass
  
file_path: SMAC3/smac/callback/callback.py
imports: from __future__ import annotations
  from ConfigSpace import Configuration
  import smac
  from smac.runhistory import TrialInfo, TrialValue
label_desc: Use image node_id 1 to create a new Callback object  with example: obj = Callback()