code: def sectional_curvature_at_identity_vec_test_data(self):
      return self.generate_vec_data()
  
imports: import geomstats.backend
  from geomstats.test.data import TestData
  from .riemannian_metric import RiemannianMetricTestData
label_desc: Use image node_id 3 for calling the InvariantMetricMatrixAtIdentityTestData obj's underlying member method code with example usage: obj.sectional_curvature_at_identity_vec_test_data() and returns: self