code: def _yield_field_names():
      for name, _ in _OLD_HEADER_FORMAT + _NEW_HEADER_FORMAT:
          if not name.startswith("_"):
              yield name
      yield "raw_vocab"
      yield "vocab_size"
      yield "nwords"
      yield "vectors_ngrams"
      yield "hidden_output"
      yield "ntokens"
  
imports: import collections
  import gzip
  import io
  import logging
  import struct
  import numpy
label_desc: Use image node_id 1 for calling a global function with example usage: _yield_field_names() without return types