code: def SupportVectors(alpha, y=None, epsilon=0):
      """indices of nonzero alphas (at tolerance epsilon)
  
      If labels y are provided, then group indices by label
      """
      import mystic.svr as svr
  
      sv = svr.SupportVectors(alpha, epsilon)
      if y is None:
          return sv
      else:
          class1 = set((y > 0).nonzero()[1])
          class2 = set((y < 0).nonzero()[1])
          sv1 = class1.intersection(sv)
          sv2 = class2.intersection(sv)
          return list(sv1), list(sv2)
  
imports: from numpy import multiply, asarray, dot, transpose, sum
label_desc: Use image node_id 3 for calling a global function with example usage: SupportVectors(alpha, y, epsilon) and returns: sv, list,  list