code: def SubTokenizedField(tokenizer):
      """
      Field for use with pytorch-transformer
      """
      FIELD = torchtext.data.RawField(
          preprocessing=lambda s: token_pre(tokenizer, s),
          postprocessing=token_post,
      )
      FIELD.is_target = False
      return FIELD
  
imports: import torchtext
  import torch
label_desc: Use image node_id 3 for calling a global function with example usage: SubTokenizedField(tokenizer) and returns: FIELD