class_docstr: Feature Importance
class_docstr_tok: ["Feature","Importance"]
docstr: Returns train_data.
docstr_tok: ["Returns","train_data","."]
code: def train_data(self):
      """Returns train_data."""
      return self._train_data
  
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 5 for calling the FeatureShapValues obj's underlying member method code with example usage: obj.train_data() and returns: self