class_docstr: A Callback class that handles additional variables and methods
  manipulation that are not provided by the library.
docstr: Performs a callback prior to the `evaluate` method.
docstr_tok: ["Performs","a","callback","prior","to","the","`","evaluate","`","method","."]
code: def on_evaluate_before(self, *evaluate_args) -> None:
      """Performs a callback prior to the `evaluate` method."""
  
      pass
  
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 6 for calling the Callback obj's underlying member method code with example usage: obj.on_evaluate_before() without return types