code: def init_solver(self, L):
      self.IL = np.zeros(L.shape, dtype=self.dtype)
      self.IL[1:, 1:] = np.linalg.inv(self.L1.todense())
  
imports: import networkx
label_desc: Use image node_id 1 for calling the FullInverseLaplacian obj's underlying member method code with example usage: obj.init_solver(L) without return types