docstr: 测试Jittor变量元组的转换
docstr_tok: ["\u6d4b\u8bd5Jittor\u53d8\u91cf\u5143\u7ec4\u7684\u8f6c\u6362"]
code: def test_var_tuple_transfer(self):
      """
      测试Jittor变量元组的转换
      """
  
      jittor_list = [jittor.rand((6, 4, 2)) for i in range(10)]
      jittor_tuple = tuple(jittor_list)
      res = jittor2torch(jittor_tuple, device="cpu")
      assert isinstance(res, tuple)
      for t in res:
          self.check_torch_tensor(t, "cpu", True)
  
imports: import pytest
  from fastNLP.envs.imports import _NEED_IMPORT_JITTOR, _NEED_IMPORT_PADDLE, _NEED_IMPORT_TORCH
  from fastNLP.modules.mix_modules.utils import paddle2torch, torch2paddle, jittor2torch, torch2jittor
label_desc: Use image node_id 4 for calling the TestJittor2Torch obj's underlying member method code with example usage: obj.test_var_tuple_transfer() without return types