code: def test_vfield_unequal_1(self):
      try:
          self.assertEqual(self.vfield1, self.vfield2)
      except AssertionError as e:
          if not str(e).startswith(
              "VectorField not almost equal to 6 decimals"
          ):
              raise self.failureException(
                  "VectorField  data mismatch error not raised."
              )
  
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 4 for calling the VectorFieldComparisonTest obj's underlying member method code with example usage: obj.test_vfield_unequal_1() without return types