code: def test_histograms_unequal_2(self):
      with self.assertRaises(AssertionError):
          self.assertEqual(self.hist1, self.hist3)
  
imports: import numpy
  from holoviews import Bars, Curve, Dimension, Histogram, Points, Scatter, VectorField
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 5 for calling the HistogramComparisonTest obj's underlying member method code with example usage: obj.test_histograms_unequal_2() without return types