code: def test_image_index(self):
      image = Image(self.array1)
      self.assertEqual(image[-0.33, -0.25], 3)
  
file_path: holoviews/holoviews/tests/element/test_image.py
imports: import numpy
  import holoviews
  from holoviews.element import Curve, Image
  from ..utils import LoggingComparisonTestCase
label_desc: Use image node_id 3 for calling the TestImage obj's underlying member method code with example usage: obj.test_image_index() without return types