code: def release_zoom(self, event):
      backend_bases.NavigationToolbar2.release_zoom(self, event)
      self.canvas.send_event("rubberband", x0=-1, y0=-1, x1=-1, y1=-1)
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  import datetime
  import io
  import json
  import os
  import warnings
  import numpy
  import tornado
  from matplotlib.backends import backend_agg
  from matplotlib.backend_bases import _Backend
  from matplotlib import backend_bases
  from matplotlib import _png
label_desc: Use image node_id 5 for calling the NavigationToolbar2WebAgg obj's underlying member method code with example usage: obj.release_zoom(event) without return types