class_docstr: Tangent bundle of a space.
class_docstr_tok: ["Tangent","bundle","of","a","space","."]
code: def _unstack(self, point):
      return (
          point[..., 0, -self.space.point_ndim + 1 :],
          point[..., 1, -self.space.point_ndim + 1 :],
      )
  
imports: from joblib import Parallel, delayed
  import geomstats.backend
  from geomstats.geometry.base import Manifold
  from geomstats.geometry.riemannian_metric import RiemannianMetric
  from geomstats.vectorization import check_is_batch
label_desc: Use image node_id 3 for calling the TangentBundle obj's underlying member method code with example usage: obj._unstack(point) and returns: point,  point