code: def test_unique(self):
      W = self.V
      W.append((numpy.array([7]), "data8", 2.8))
      W.append((numpy.array([0]), "data1", 2.8))
      W.append((numpy.array([1]), "data2", 2.8))
      W.append((numpy.array([6]), "data7", 2.8))
  
      result = self.unique.filter_vectors(W)
      self.assertEqual(len(result), 8)
  
file_path: NearPy/tests/filters_tests.py
imports: import numpy
  import unittest
  from nearpy.filters import NearestFilter, DistanceThresholdFilter, UniqueFilter
label_desc: Use image node_id 4 for calling the TestVectorFilters obj's underlying member method code with example usage: obj.test_unique() without return types