class_docstr: Base class for an Ax model.
  
  Note: the core methods each model has: `fit`, `predict`, `gen`,
  `cross_validate`, and `best_point` are not present in this base class,
  because the signatures for those methods vary based on the type of the model.
  This class only contains the methods that all models have in common and for
  which they all share the signature.
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code: def feature_importances(self) -> Any:
      raise NotImplementedError(
          "Feature importance not available for this Model type"
      )
  
imports: from typing import Any, Dict
label_desc: Use image node_id 4 for calling the Model obj's underlying member method code with example usage: obj.feature_importances() without return types