code: def iob1_to_bioul(tag_sequence: List[str]) -> List[str]:
      warnings.warn(
          "iob1_to_bioul has been replaced with 'to_bioul' to allow more encoding options.",
          FutureWarning,
      )
      return to_bioul(tag_sequence)
  
file_path: allennlp/allennlp/data/dataset_readers/dataset_utils/span_utils.py
imports: from typing import Callable, List, Set, Tuple, TypeVar, Optional
  import warnings
  from allennlp.common.checks import ConfigurationError
  from allennlp.data.tokenizers import Token
label_desc: Use image node_id 6 for calling a global function with example usage: iob1_to_bioul(tag_sequence) and returns: to_bioul