code: def test_train_tictactoe(self):
      hparams = registry.hparams("rlmf_tictactoe")
      hparams.batch_size = 2
      hparams.eval_sampling_temps = [0.0, 1.0]
      hparams.add_hparam("ppo_epochs_num", 2)
      hparams.add_hparam("ppo_epoch_length", 3)
  
      hparams.epochs_num = 100
      hparams.eval_every_epochs = 25
  
      FLAGS.output_dir = tf.test.get_temp_dir()
      FLAGS.env_problem_name = "tic_tac_toe_env_problem"
      trainer_model_free.train(
          hparams, FLAGS.output_dir, FLAGS.env_problem_name
      )
  
file_path: tensor2tensor/tensor2tensor/rl/trainer_model_free_tictactoe_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from tensor2tensor.rl import trainer_model_free
  from tensor2tensor.utils import registry
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling the TrainerModelFreeTicTacToeTest obj's underlying member method code with example usage: obj.test_train_tictactoe() without return types