class_docstr: Plays `batch_size` games of tic-tac-toe.
code: def action_modality(self):
      return modalities.ModalityType.SYMBOL_WEIGHTS_ALL
  
file_path: tensor2tensor/tensor2tensor/envs/tic_tac_toe_env_problem.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from tensor2tensor.envs import gym_env_problem
  from tensor2tensor.layers import modalities
  from tensor2tensor.utils import registry
label_desc: Use image node_id 6 for calling the TicTacToeEnvProblem obj's underlying member method code with example usage: obj.action_modality() and returns: modalities