code: def inner_product_test_data(self):
      sqrt2 = 1.0 / gs.sqrt(2.0)
      tangent_vec_a = gs.array(
          [[-5.55360367e-01, -5.55360367e-01, 0.0], [0.0, 0.0, 0.0]]
      )
      tangent_vec_b = -tangent_vec_a
      base_point = gs.array([[sqrt2, -sqrt2, 0], [sqrt2, sqrt2, 1]])
      data = [
          dict(
              tangent_vec_a=tangent_vec_a,
              tangent_vec_b=tangent_vec_b,
              base_point=base_point,
              expected=-0.61685,
          )
      ]
      return self.generate_tests(data)
  
imports: import geomstats.backend
  from geomstats.test.data import TestData
label_desc: Use image node_id 1 for calling the SasakiMetricSphereTestData obj's underlying member method code with example usage: obj.inner_product_test_data() and returns: self