class_docstr: Spider: a set of rays attached to the origin.
  
  The k-spider consists of k copies of the positive real line
  :math:`\mathbb{R}_{\geq 0}` glued together at the origin [Feragen2020]_.
  
  Parameters
  ----------
  n_rays : int
      Number of rays to attach to the origin.
      Note that zero counts as the origin not as a ray.
  
  References
  ----------
  .. [Feragen2020]  Feragen, Aasa, and Tom Nye. "Statistics on stratified spaces."
      Riemannian Geometric Statistics in Medical Image Analysis.
      Academic Press, 2020. 299-342.
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docstr: Metric to equip the space with if equip is True.
docstr_tok: ["Metric","to","equip","the","space","with","if","equip","is","True","."]
code: def default_metric():
      """Metric to equip the space with if equip is True."""
      return SpiderMetric
  
imports: import geomstats.backend
  from geomstats.geometry.euclidean import Euclidean
  from geomstats.geometry.stratified.point_set import Point, PointSet, PointSetMetric, _vectorize_point, broadcast_lists
label_desc: Use image node_id 2 for calling the Spider obj's underlying member method code with example usage: obj.default_metric() and returns: SpiderMetric