可以修改board的大小吗，12*12太小了，能否改成36*36或者铺满整个屏幕的

[aijunzhao]

我一改动，就报错，怎么修改才可以呢？

[aijunzhao]

这是改成24*24的报错。

(SnakeAI) E:\snake-ai-master\main>python test_cnn.py
Using seed = 591160627 for testing.
=================== Episode 1 ==================
Traceback (most recent call last):
File "test_cnn.py", line 45, in
action, _ = model.predict(obs, action_masks=env.get_action_mask())
File "C:\Users\KEN2020.conda\envs\SnakeAI\lib\site-packages\sb3_contrib\ppo_mask\ppo_mask.py", line 379, in predict
return self.policy.predict(observation, state, episode_start, deterministic, action_masks=action_masks)
File "C:\Users\KEN2020.conda\envs\SnakeAI\lib\site-packages\sb3_contrib\common\maskable\policies.py", line 276, in predict
observation, vectorized_env = self.obs_to_tensor(observation)
File "C:\Users\KEN2020.conda\envs\SnakeAI\lib\site-packages\stable_baselines3\common\policies.py", line 263, in obs_to_tensor
vectorized_env = is_vectorized_observation(observation, self.observation_space)
File "C:\Users\KEN2020.conda\envs\SnakeAI\lib\site-packages\stable_baselines3\common\utils.py", line 398, in is_vectorized_observation
return is_vec_obs_func(observation, observation_space)
File "C:\Users\KEN2020.conda\envs\SnakeAI\lib\site-packages\stable_baselines3\common\utils.py", line 265, in is_vectorized_box_observation
raise ValueError(
ValueError: Error: Unexpected observation shape (168, 168, 3) for Box environment, please use (3, 84, 84) or (n_env, 3, 84, 84) for the observation shape.

(SnakeAI) E:\snake-ai-master\main>

[lang07123]

这个东西可能比你想象中的要复杂, 如果你需要修改棋盘大小, 那么你需要重新训练模型, (我措辞好几次, 发现我的知识不足以解释清楚为什么需要重新训练, 放弃了..) 但是它的难度提升之大, 远不是 16 - 12 能比拟的...你的训练时间会成倍增长, 套用作者的计算方式.

(SnakeAI) PS E:\ai-demo\snake-ai-master\main> python ..\utils\path_counter.py
The total number of path with length 60 in a 12x12 grid is  6353172170978043900310938172858813152.
(SnakeAI) PS E:\ai-demo\snake-ai-master\main> python ..\utils\path_counter.py
The total number of path with length 60 in a 16x16 grid is 22725213785431853779603119329747403536.

如果你实在需要更大的棋盘的模型, 你需要修改两个地方, 以16为例子, 简单来说gym.spaces.Box的shape,为 16 * 7 (别问为什么解释不了.)
snake_game_custom_wrapper_cnn.py