class_docstr: Blackbox Optimiser Class. 
class_docstr_tok: ["Blackbox","Optimiser","Class","."]
docstr: Header for black box optimisation. 
docstr_tok: ["Header","for","black","box","optimisation","."]
code: def _get_exd_child_header_str(self):
      """Header for black box optimisation."""
      ret = "curr_max=<current_maximum_value>"
      if self.func_caller.is_mf():
          ret += (
              ", f2o=<#queries_at_highest_fidelity>"
              + "(<#queries_at_highest_fidelity_in_last_20_iterations>)"
          )
      ret += self._get_opt_method_header_str()
      return ret
  
imports: from __future__ import division
  from argparse import Namespace
  import numpy
  from ..exd.exd_core import ExperimentDesigner, exd_core_args
  from ..utils.option_handler import load_options
label_desc: Use image node_id 9 for calling the BlackboxOptimiser obj's underlying member method code with example usage: obj._get_exd_child_header_str() and returns: ret