class_docstr: A widget for interacting with Captum Insights.
code: def _fetch_data(self, change):
      if not self.config:
          return
      with self.out:
          self.visualizer._update_config(self.config)
          self.output = namedtuple_to_dict(self.visualizer.visualize())
          self.config = dict()
  
file_path: captum/captum/insights/attr_vis/widget/widget.py
imports: import ipywidgets
  from captum.insights import AttributionVisualizer
  from captum.insights.attr_vis.server import namedtuple_to_dict
  from traitlets import Dict, Instance, List, observe, Unicode
label_desc: Use image node_id 2 for calling the CaptumInsights obj's underlying member method code with example usage: obj._fetch_data(change) without return types