code: def autotune(self, config_file=None, **kwargs):
      config = Config.load_from_file(config_file)
      if config:
          return config
      kwargs, results = optimize(self, **kwargs)
      valid_configs = [sol for dim, sol in results if sol is not None]
      if not valid_configs:
          raise Exception("No valid configuration found!")
      best_time, best_config = min(valid_configs)
      config = Config.create(best_config, kwargs, best_time)
      if config_file is not None:
          config.save(config_file)
      return config
  
imports: import os, sys, json, re
  import tempfile
  import copy
  import inspect
  import logging
  import importlib
  from .None import solver
  from .None import patterns
label_desc: Use image node_id 9 for calling the Custom obj's underlying member method code with example usage: obj.autotune(config_file) and returns: config, config