code: def setup_method(self):
      if not hasattr(self, "data_generator"):
          self.data_generator = RandomDataGenerator(self.space)
  
imports: import pytest
  import geomstats.backend
  from geomstats.geometry.discrete_curves import SRVTranslationMetric
  from geomstats.learning.frechet_mean import GradientDescent, variance
  from geomstats.test.random import RandomDataGenerator
  from geomstats.test.test_case import TestCase
  from geomstats.test_cases.learning._base import BaseEstimatorTestCase, MeanEstimatorMixinsTestCase
  from geomstats.vectorization import repeat_point
label_desc: Use image node_id 1 for calling the BatchGradientDescentTestCase obj's underlying member method code with example usage: obj.setup_method() without return types