class_docstr: Problem spec for WMT En-Fr translation.
class_docstr_tok: ["Problem","spec","for","WMT","En-Fr","translation","."]
code: def approx_vocab_size(self):
      return 2**13
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  from tensor2tensor.data_generators import problem
  from tensor2tensor.data_generators import text_encoder
  from tensor2tensor.data_generators import text_problems
  from tensor2tensor.data_generators import translate
  from tensor2tensor.data_generators import wiki_lm
  from tensor2tensor.utils import registry
label_desc: Use image node_id 1 for calling the TranslateEnfrWmtSmall8k obj's underlying member method code with example usage: obj.approx_vocab_size() and returns: unknown