code: def transform_tangent_vec(self, tangent_vec, base_point):
      return self.space.ball_to_half_space_tangent(
          tangent_vec,
          base_point,
      )
  
imports: import pytest
  import geomstats.backend
  from geomstats.geometry.hyperbolic import Hyperbolic
  from geomstats.test.test_case import TestCase
  from geomstats.test.utils import PointTransformer
  from geomstats.test.vectorization import generate_vectorization_data
  from geomstats.test_cases.geometry.riemannian_metric import RiemannianMetricTestCase
label_desc: Use image node_id 1 for calling the BallToHalfSpace obj's underlying member method code with example usage: obj.transform_tangent_vec(tangent_vec, base_point) and returns: self