code: def solve(self, rhs):
      s = np.zeros(rhs.shape, dtype=self.dtype)
      s[1:] = sp.sparse.linalg.cg(self.L1, rhs[1:], M=self.M, atol=0)[0]
      return s
  
imports: import networkx
label_desc: Use image node_id 2 for calling the CGInverseLaplacian obj's underlying member method code with example usage: obj.solve(rhs) and returns: s