code: def fail(*args):
      raise pb_utils.TritonModelException("Error test.")
  
file_path: towhee/tests/unittests/serve/triton/test_triton_client.py
imports: import unittest
  import torch
  from towhee.serve.triton.triton_client import TritonClient
  from towhee.serve.triton.bls.python_backend_wrapper import pb_utils
label_desc: Use image node_id 2 for calling a global function with example usage: fail() without return types