class_docstr: Nested search space for hyperparameters which are categorical. Such a hyperparameter takes one value out of the discrete set of provided options.
     The first value in the list of options will be the default value that gets tried first during HPO.
  
  Parameters
  ----------
  data : Space or python built-in objects
      the choice candidates
  
  Examples
  --------
  >>> a = Categorical('a', 'b', 'c', 'd')  # 'a' will be default value tried first during HPO
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code: def __getitem__(self, index):
      return self.data[index]
  
label_desc: Use image node_id 3 for calling the Categorical obj's underlying member method code with example usage: obj.__getitem__(index) and returns: self