code: def scalar_curvature(base_point):
      kappa = base_point[..., 0]
      return (
          gs.polygamma(1, kappa) + kappa * gs.polygamma(2, kappa)
      ) / (2 * (-1 + kappa * gs.polygamma(1, kappa)) ** 2)
  
imports: import pytest
  import geomstats.backend
  from geomstats.test.vectorization import generate_vectorization_data
  from geomstats.test_cases.geometry.base import VectorSpaceOpenSetTestCase
  from geomstats.test_cases.geometry.riemannian_metric import RiemannianMetricTestCase
  from geomstats.test_cases.information_geometry.base import InformationManifoldMixinTestCase
label_desc: Use image node_id 1 for calling a global function with example usage: scalar_curvature(base_point) and returns: unknown