code: def test_character_table(self):
      ctable = create_ctable()
      text = "410+19"
      enc_text = ctable.encode(text)
      dec_text = ctable.decode(enc_text)
      # The text is possibly padded with whitespace, but the trimmed output should
      # be equal to the input.
      self.assertEqual(text, dec_text.strip())
  
file_path: flax/examples/seq2seq/train_test.py
imports: import functools
  from absl.testing import absltest
  from flax.training import train_state
  import jax
  from jax import random
  import numpy
  import optax
  import input_pipeline
  import train
  import models
label_desc: Use image node_id 1 for calling the TrainTest obj's underlying member method code with example usage: obj.test_character_table() without return types