code: def test_serialize(self):
      self._test_serialize(DenseVector(range(10)))
      self._test_serialize(DenseVector(array([1.0, 2.0, 3.0, 4.0])))
      self._test_serialize(DenseVector(pyarray.array("d", range(10))))
      self._test_serialize(SparseVector(4, {1: 1, 3: 2}))
      self._test_serialize(SparseVector(3, {}))
      self._test_serialize(DenseMatrix(2, 3, range(6)))
      sm1 = SparseMatrix(
          3, 4, [0, 2, 2, 4, 4], [1, 2, 1, 2], [1.0, 2.0, 4.0, 5.0]
      )
      self._test_serialize(sm1)
  
imports: import unittest
  import array
  from numpy import arange, array, array_equal, inf, ones, tile, zeros
  from pyspark.serializers import CPickleSerializer
  from pyspark.ml.linalg import DenseMatrix, DenseVector, MatrixUDT, SparseMatrix, SparseVector, Vector, VectorUDT, Vectors
  from pyspark.testing.mllibutils import MLlibTestCase
  from pyspark.sql import Row
  from pyspark.sql.functions import unwrap_udt
label_desc: Use image node_id 2 for calling the VectorTests obj's underlying member method code with example usage: obj.test_serialize() without return types