class_docstr: 测试其它函数的测试例
class_docstr_tok: ["\u6d4b\u8bd5\u5176\u5b83\u51fd\u6570\u7684\u6d4b\u8bd5\u4f8b"]
code: def test_is_distributed(self):
      assert self.driver.is_distributed() == False
  
imports: import pytest
  from pathlib import Path
  from fastNLP.core.drivers.paddle_driver.single_device import PaddleSingleDriver
  from fastNLP.core.samplers import ReproduceBatchSampler, RandomSampler
  from tests.helpers.models.paddle_model import PaddleNormalModel_Classification_1
  from tests.helpers.datasets.paddle_data import PaddleNormalDataset, PaddleNormalXYDataset
  from tests.helpers.datasets.torch_data import TorchNormalDataset
  from tests.helpers.models.torch_model import TorchNormalModel_Classification_1
  from fastNLP.envs.distributed import rank_zero_rm
  from fastNLP.envs.imports import _NEED_IMPORT_PADDLE, _NEED_IMPORT_TORCH
  from fastNLP import prepare_paddle_dataloader, BucketedBatchSampler
label_desc: Use image node_id 3 for calling the TestSingleDeviceFunction obj's underlying member method code with example usage: obj.test_is_distributed() without return types