class_docstr: Hyper Parameter Tuning
class_docstr_tok: ["Hyper","Parameter","Tuning"]
docstr: Returns hyper-parameter tuning history.
docstr_tok: ["Returns","hyper-parameter","tuning","history","."]
code: def history(self):
      """Returns hyper-parameter tuning history."""
      return self._history
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from xai.formatter.contents.base import Content
  from xai.formatter.writer.base import Writer
label_desc: Use image node_id 2 for calling the HyperParameterTuning obj's underlying member method code with example usage: obj.history() and returns: self