code: def get_pad_token(self):
      if self.model_type in ["bart", "roberta", "xlnet"]:
          return "<pad>"
      if self.model_type in ["bert"]:
          return "[PAD]"
  
imports: import numpy
  import string
  import nlpaug.util.selection.filtering
label_desc: Use image node_id 15 for calling the LanguageModels obj's underlying member method code with example usage: obj.get_pad_token() and returns: str, str