code: def test_inference(self):
      self._test_inference(1)
      self._test_inference(3)
  
imports: import os
  import unittest
  import torch
  from tests import get_tests_input_path
  from TTS.vc.configs.freevc_config import FreeVCConfig
  from TTS.vc.models.freevc import FreeVC
label_desc: Use image node_id 9 for calling the TestFreeVC obj's underlying member method code with example usage: obj.test_inference() without return types