text: Title: DataFilesNotFoundError for datasets LM1B
  Body: ### Describe the bug
  
  Cannot load the dataset https://huggingface.co/datasets/billion-word-benchmark/lm1b
  
  ### Steps to reproduce the bug
  
  `dataset = datasets.load_dataset('lm1b', split=split)`
  
  ### Expected behavior
  
  `Traceback (most recent call last):
    File "/home/hml/projects/DeepLearning/Generative_model/Diffusion-BERT/word_freq.py", line 13, in <module>
      train_data = DiffusionLoader(tokenizer=tokenizer).my_load(task_name='lm1b', splits=['train'])[0]
    File "/home/hml/projects/DeepLearning/Generative_model/Diffusion-BERT/dataloader.py", line 20, in my_load
      return [self._load(task_name, name) for name in splits]
    File "/home/hml/projects/DeepLearning/Generative_model/Diffusion-BERT/dataloader.py", line 20, in <listcomp>
      return [self._load(task_name, name) for name in splits]
    File "/home/hml/projects/DeepLearning/Generative_model/Diffusion-BERT/dataloader.py", line 13, in _load
      dataset = datasets.load_dataset('lm1b', split=split)
    File "/home/hml/.conda/envs/DB/lib/python3.10/site-packages/datasets/load.py", line 2594, in load_dataset
      builder_instance = load_dataset_builder(
    File "/home/hml/.conda/envs/DB/lib/python3.10/site-packages/datasets/load.py", line 2266, in load_dataset_builder
      dataset_module = dataset_module_factory(
    File "/home/hml/.conda/envs/DB/lib/python3.10/site-packages/datasets/load.py", line 1827, in dataset_module_factory
      ).get_module()
    File "/home/hml/.conda/envs/DB/lib/python3.10/site-packages/datasets/load.py", line 1040, in get_module
      module_name, default_builder_kwargs = infer_module_for_data_files(
    File "/home/hml/.conda/envs/DB/lib/python3.10/site-packages/datasets/load.py", line 598, in infer_module_for_data_files
      raise DataFilesNotFoundError("No (supported) data files found" + (f" in {path}" if path else ""))
  datasets.exceptions.DataFilesNotFoundError: No (supported) data files found in lm1b`
  
  ### Environment info
  
  datasets: 2.20.0