class_docstr: Feature Importance
class_docstr_tok: ["Feature","Importance"]
docstr: Returns feature importance ranking.
docstr_tok: ["Returns","feature","importance","ranking","."]
code: def importance_ranking(self):
      """Returns feature importance ranking."""
      return self._importance_ranking
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from typing import List, Tuple
  import numpy
  from xai.formatter.contents.base import Content
  from xai.formatter.writer.base import Writer
label_desc: Use image node_id 2 for calling the FeatureImportance obj's underlying member method code with example usage: obj.importance_ranking() and returns: self