class_docstr: Vinegre cipher.
class_docstr_tok: ["Vinegre","cipher","."]
code: def dev_length(self):
      return self.train_length
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from collections import deque
  import numpy
  from tensor2tensor.data_generators import algorithmic
  from tensor2tensor.utils import registry
label_desc: Use image node_id 6 for calling the AlgorithmicCipherVigenere5 obj's underlying member method code with example usage: obj.dev_length() and returns: self