class_docstr: A custom configuration file parser for SKLL.
docstr: Find the set of invalid options specified by the user.
  
  Returns
  -------
  invalid_options : Set[str]
      The set of invalid options specified by the user.
docstr_tok: ["Find","the","set","of","invalid","options","specified","by","the","user",".","Returns","--","--","--","-","invalid_options",":","Set","[","str","]","The","set","of","invalid","options","specified","by","the","user","."]
code: def _find_invalid_options(self) -> Set[str]:
      """
      Find the set of invalid options specified by the user.
  
      Returns
      -------
      invalid_options : Set[str]
          The set of invalid options specified by the user.
      """
      # compute a list of all the valid options
      valid_options = (
          list(self.defaults().keys()) + self._required_options
      )
  
      # get a set of all of the specified options
      specified_options = set(
          itertools.chain(
              *[self.options(section) for section in self.sections()]
          )
      )
  
      # find any invalid options and return
      invalid_options = set(specified_options).difference(valid_options)
      return invalid_options
  
imports: import configparser
  import itertools
  import logging
  import os
  from numbers import Number
  from os.path import basename, join
  from pathlib import Path
  from typing import Any, Dict, List, Optional, Set, Tuple, Union
  import numpy
  from ruamel.yaml import YAML
  from skll.data.readers import safe_float
  from skll.types import ClassMap, FoldMapping, LabelType, PathOrStr
  from skll.utils.constants import PROBABILISTIC_METRICS, VALID_FEATURE_SCALING_OPTIONS, VALID_SAMPLERS, VALID_TASKS
  from skll.utils.logging import get_skll_logger
  from .utils import _munge_featureset_name, _parse_and_validate_metrics, fix_json, load_cv_folds, locate_file
label_desc: Use image node_id 2 for calling the SKLLConfigParser obj's underlying member method code with example usage: obj._find_invalid_options() and returns: invalid_options