code: def test_nas_seq2seq(self):
      hparams = self._get_encoder_hparams()
      _add_transformer_branching_hparams(hparams)
      self._test_model(translation_nas_net.NasSeq2Seq, hparams)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  import numpy
  from tensor2tensor.data_generators import problem_hparams
  from tensor2tensor.layers import common_attention
  from tensor2tensor.models import transformer
  from tensor2tensor.models.neural_architecture_search import nas_layers
  from tensor2tensor.models.neural_architecture_search import nas_model
  import tensorflow.compat.v1
  from tensorflow.compat.v1 import estimator
label_desc: Use image node_id 3 for calling the NasSeq2SeqTest obj's underlying member method code with example usage: obj.test_nas_seq2seq() without return types