code: def enable_progress_bars() -> None:
      """
      Enable globally progress bars used in `datasets` except if `HF_DATASETS_DISABLE_PROGRESS_BAR` environment
      variable has been set.
  
      Use [`~utils.disable_progress_bars`] to disable them.
      """
      if HF_DATASETS_DISABLE_PROGRESS_BARS is True:
          warnings.warn(
              "Cannot enable progress bars: environment variable `HF_DATASETS_DISABLE_PROGRESS_BAR=1` is set and has"
              " priority."
          )
          return
      global _hf_datasets_progress_bars_disabled
      _hf_datasets_progress_bars_disabled = False
  
file_path: datasets/src/datasets/utils/tqdm.py
imports: import warnings
  from tqdm.auto import tqdm
  from ..config import HF_DATASETS_DISABLE_PROGRESS_BARS
label_desc: Use image node_id 2 for calling a global function with example usage: enable_progress_bars() without return types