class_docstr: A plugin to visualize Fairness Indicators.
code: def _get_output_file_format(self, evaluation_output_path):
      file_format = os.path.splitext(evaluation_output_path)[1]
      if file_format:
          return file_format[1:]
  
      return ""
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  from absl import logging
  from tensorboard_plugin_fairness_indicators import metadata
  import six
  import tensorflow_model_analysis
  from tensorflow_model_analysis.addons.fairness.view import widget_view
  from werkzeug import wrappers
  from google.protobuf import json_format
  from tensorboard.backend import http_util
  from tensorboard.plugins import base_plugin
label_desc: Use image node_id 8 for calling the FairnessIndicatorsPlugin obj's underlying member method code with example usage: obj._get_output_file_format(evaluation_output_path) and returns: str, file_format