class_docstr: Wraps multiple callbacks in an ready-to-use class.
docstr: List of Callback-based childs.
docstr_tok: ["List","of","Callback-based","childs","."]
code: def callbacks(self) -> List[Callback]:
      """List of Callback-based childs."""
  
      return self._callbacks
  
imports: from typing import List, TypeVar, Union
  import numpy
  import opytimizer.utils.exception
  from opytimizer.core.space import Space
label_desc: Use image node_id 2 for calling the CallbackVessel obj's underlying member method code with example usage: obj.callbacks() and returns: self