code: def get_original_order_from_reordered_list(L, ordering):
      """Returns the original order from a reordered list."""
      ret = [None] * len(ordering)
      for orig_idx, ordered_idx in enumerate(ordering):
          ret[ordered_idx] = L[orig_idx]
      return ret
  
imports: from __future__ import print_function
  from __future__ import division
  import numpy
  from scipy.sparse import dok_matrix
  from scipy.linalg import solve_triangular
label_desc: Use image node_id 22 for calling a global function with example usage: get_original_order_from_reordered_list(L, ordering) and returns: ret