class_docstr: Same as CopySequence but with smaller sequences.
    
class_docstr_tok: ["Same","as","CopySequence","but","with","smaller","sequences","."]
code: def num_symbols(self):
      return 64
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import random
  from six.moves import range
  from tensor2tensor.data_generators import problem
  from tensor2tensor.data_generators import text_encoder
  from tensor2tensor.data_generators import text_problems
  from tensor2tensor.utils import registry
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling the CopySequenceSmall obj's underlying member method code with example usage: obj.num_symbols() and returns: int