code: def _append_token(token):
      return token is not None and token != ""
  
imports: import numpy
  import tensorflow
  from tensorflow.contrib.slim.python.slim.data import data_decoder
  from texar.tf.data.vocabulary import SpecialTokens
  from texar.tf.utils import dtypes
  from texar.tf.hyperparams import HParams
label_desc: Use image node_id 1 for calling a global function with example usage: _append_token(token) and returns: unknown