code: def validate_config(config):
      """Determines whether config appears to be a valid layer config."""
      return (
          isinstance(config, dict)
          and _LAYER_UNDEFINED_CONFIG_KEY not in config
      )
  
imports: import contextlib
  import inspect
  import json
  import threading
  import weakref
  from keras.api_export import keras_export
  from keras.saving import object_registration
label_desc: Use image node_id 9 for calling a global function with example usage: validate_config(config) and returns: unknown