code: def test_columns_sample_homogeneous(self):
      samples = self.columns.sample([0, 5, 10]).dimension_values("y")
      self.assertEqual(samples, np.array([0, 10, 20]))
  
imports: import numpy
  from holoviews import Dataset, HoloMap
  from holoviews.core import Dimension
  from holoviews.core.ndmapping import MultiDimensionalMapping, NdMapping, UniformNdMapping
  from holoviews.core.overlay import Overlay
  from holoviews.element import Curve
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 5 for calling the HoloMapTest obj's underlying member method code with example usage: obj.test_columns_sample_homogeneous() without return types