code: def test_from_to_pandas(self):
      sparse_values = {0: 0.1, 1: 1.1}
      sparse_vector = SparseVector(len(sparse_values), sparse_values)
      pser = pd.Series([sparse_vector])
      psser = ps.Series([sparse_vector])
      self.assert_eq(pser, psser._to_pandas())
      self.assert_eq(ps.from_pandas(pser), psser)
  
imports: import pandas
  import pyspark.pandas
  from pyspark.ml.linalg import SparseVector
  from pyspark.testing.pandasutils import PandasOnSparkTestCase
  from pyspark.pandas.tests.data_type_ops.testing_utils import OpsTestBase
label_desc: Use image node_id 19 for calling the UDTOpsTestsMixin obj's underlying member method code with example usage: obj.test_from_to_pandas() without return types