docstr: Add a batch of predictions and references for the metric's stack.
docstr_tok: ["Add","a","batch","of","predictions","and","references","for","the","metric","'s","stack","."]
code: def add_batch(self, predictions=None, references=None, **kwargs):
      """Add a batch of predictions and references for the metric's stack."""
      # References can be strings or lists of strings
      # Let's change strings to lists of strings with one element
      if references is not None:
          references = [
              [ref] if isinstance(ref, str) else ref
              for ref in references
          ]
      super().add_batch(
          predictions=predictions, references=references, **kwargs
      )
  
file_path: datasets/metrics/bertscore/bertscore.py
imports: import functools
  from contextlib import contextmanager
  import bert_score
  from packaging import version
  import datasets
label_desc: Use image node_id 3 for calling the BERTScore obj's underlying member method code with example usage: obj.add_batch(predictions, references) without return types