code: def test_mul():
      encrypted = pk.encrypt_tensor(
          torch.tensor([[1.0, 2.0, 3.0, 4.0], [5.0, 6.0, 7.0, -8.0]])
      )
      double_encrypted = torch.mul(encrypted, 2)
      double_encrypted = torch.mul(double_encrypted, torch.rand(2, 4))
      decrypted = sk.decrypt_tensor(double_encrypted)
      print(decrypted)
  
file_path: FATE/python/fate/test/test_vertor_paillier.py
imports: import torch
  from fate.arch import Context
label_desc: Use image node_id 4 for calling a global function with example usage: test_mul() without return types