code: def test_initialization_belongs(self, n_samples, atol):
      X = self.data_generator.random_point(n_points=n_samples)
      init_cluster_centers = self.estimator._pick_init_cluster_centers(
          X
      )
      belongs = self.estimator.space.belongs(
          init_cluster_centers, atol=atol
      )
      self.assertTrue(gs.all(belongs))
  
file_path: geomstats/geomstats/test_cases/learning/kmeans.py
imports: import pytest
  import geomstats.backend
  from geomstats.test_cases.learning._base import BaseEstimatorTestCase
label_desc: Use image node_id 1 for calling the ClusterInitializationTestCase obj's underlying member method code with example usage: obj.test_initialization_belongs(n_samples, atol) without return types