code: def tangent_riemannian_submersion(self, tangent_vec, base_point):
      product = Matrices.mul(
          base_point, Matrices.transpose(tangent_vec)
      )
      return 2 * Matrices.to_symmetric(product)
  
imports: import pytest
  import geomstats.backend
  from geomstats.geometry.fiber_bundle import FiberBundle
  from geomstats.geometry.matrices import Matrices
  from geomstats.geometry.special_orthogonal import SpecialOrthogonal
  from geomstats.test.random import RandomDataGenerator
  from geomstats.test.test_case import TestCase
  from geomstats.test.vectorization import generate_vectorization_data
label_desc: Use image node_id 3 for calling the GeneralLinearBuresWassersteinBundle obj's underlying member method code with example usage: obj.tangent_riemannian_submersion(tangent_vec, base_point) and returns: unknown