code: def log_after_exp_at_identity_test_data(self):
      return self.generate_random_data()
  
imports: import geomstats.backend
  from geomstats.test.data import TestData
  from .riemannian_metric import RiemannianMetricTestData
label_desc: Use image node_id 6 for calling the InvariantMetricMatrixAtIdentityTestData obj's underlying member method code with example usage: obj.log_after_exp_at_identity_test_data() and returns: self