code: def is_basic_scheme(all_tags):
      """
      Check if a basic tagging scheme is used. Return True if so.
  
      Args:
          all_tags: a list of NER tags
  
      Returns:
          True if the tagging scheme does not use B-, I-, etc, otherwise False
      """
      for tag in all_tags:
          if len(tag) > 2 and tag[:2] in (
              "B-",
              "I-",
              "S-",
              "E-",
              "B_",
              "I_",
              "S_",
              "E_",
          ):
              return False
      return True
  
file_path: stanza/stanza/models/ner/utils.py
imports: import logging
  from stanza.models.common.vocab import EMPTY
label_desc: Use image node_id 1 for calling a global function with example usage: is_basic_scheme(all_tags) and returns: True, False