class_docstr: DNAEncoder for delimiter separated subsequences.
  
  Uses ',' as default delimiter.
class_docstr_tok: ["DNAEncoder","for","delimiter","separated","subsequences",".","Uses","'",",","'","as","default","delimiter","."]
code: def _tokens(self):
      return super(DelimitedDNAEncoder, self)._tokens() + [
          self._delimiter_key
      ]
  
file_path: tensor2tensor/tensor2tensor/data_generators/dna_encoder.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import itertools
  from six.moves import range
  from tensor2tensor.data_generators import text_encoder
label_desc: Use image node_id 3 for calling the DelimitedDNAEncoder obj's underlying member method code with example usage: obj._tokens() and returns: unknown