code: def init_solver(self, L):
      import scipy as sp
  
      self.lusolve = sp.sparse.linalg.factorized(self.L1.tocsc())
  
imports: import networkx
label_desc: Use image node_id 1 for calling the SuperLUInverseLaplacian obj's underlying member method code with example usage: obj.init_solver(L) without return types