docstr: find all expected files in self.dir_
  fills self.found_files
docstr_tok: ["find","all","expected","files","in","self.dir_","fills","self.found_files"]
code: def _find_files(self):
      """
      find all expected files in self.dir_
      fills self.found_files
      """
      expected = [
          # "description.txt",
          "algorithm_runs.arff",
          "feature_values.arff",
          # "feature_runstatus.arff",
      ]
      optional = [
          "ground_truth.arff",
          "feature_costs.arff",
          "citation.bib",
          "cv.arff",
          "configurations.csv",
      ]
  
      for expected_file in expected:
          full_path = os.path.join(self.dir_, expected_file)
          if not os.path.isfile(full_path):
              self.logger.error(
                  "Not found: %s (has to be added)" % (full_path)
              )
          else:
              self.found_files.append(full_path)
  
      for expected_file in optional:
          full_path = os.path.join(self.dir_, expected_file)
          if not os.path.isfile(full_path):
              # self.logger.warning(
              #     "Not found: %s (maybe you want to add it)" % (full_path))
              pass
          else:
              self.found_files.append(full_path)
  
file_path: auto-sklearn/autosklearn/metalearning/input/aslib_simple.py
imports: import csv
  import logging
  import os
  from collections import OrderedDict, defaultdict
  import arff
  import pandas
  from ConfigSpace.configuration_space import ConfigurationSpace
label_desc: Use image node_id 2 for calling the AlgorithmSelectionProblem obj's underlying member method code with example usage: obj._find_files() without return types