class_docstr: Sort example gallery by title of subsection.
  Assumes README.txt exists for all subsections and uses the subsection with
  dashes, '---', as the adornment.
code: def __repr__(self):
      return "<%s>" % (self.__class__.__name__,)
  
file_path: scikit-optimize/doc/conf.py
imports: import warnings
  import os
  import re
  from packaging.version import parse
  import sys
  import skopt
  from github_link import make_linkcode_resolve
  import sphinx_gallery
label_desc: Use image node_id 2 for calling the SubSectionTitleOrder obj's underlying member method code with example usage: obj.__repr__() and returns: unknown