Git Automation
Some of you may have read my Git Battles post, where I talked about how I developed and a documented a Git workflow.
AI Snake Lab 是一个交互式强化学习沙盒,可在经典贪吃蛇游戏环境中试验 AI 智能体。它提供实时 Textual 终端用户界面(TUI)、灵活的经验回放数据库和模块化模型定义。

| 组件 | 说明 |
|---|---|
| Python 3.11+ | 核心编程语言 |
| Textual | 终端 UI 框架 |
| SQLite3 | 轻量级经验回放与实验存储 |
| PyTorch(可选) | 模型深度学习后端 |
| Plotext / Matplotlib | 可视化工具 |
勾选 Dynamic Training(动态训练)后,每个 epoch 结束时执行的长时记忆训练次数会逐渐增加。随着 epoch 总数上升,每个 epoch 结束时调用 AIAgent:train_long_memory() 的次数也会增加,最高不超过 MAX_ADAPTIVE_TRAINING_LOOPS,根据以下计算,目前上限为 16:
if self.dynamic_training():
loops = max(
1, min(self.epoch() // 250, DAIAgent.MAX_DYNAMIC_TRAINING_LOOPS)
)
else:
loops = 1
while loops > 0:
loops -= 1
self.train_long_memory()
受 Richard Sutton 的《苦涩的教训》启发,Epsilon N 类可以直接替换传统的 Epsilon Greedy 算法。它针对每个分数建立独立的传统 Epsilon Greedy 实例。例如,当 AI 分数为 7 时,使用的是 self._epsilons[7] 中的实例。
下面的截图显示使用单一 Epsilon Greedy 实例,并启用动态训练时的最高分曲线。单实例 epsilon 算法很快收敛,但进步并不均匀。最高分曲线的突然跳跃说明,在 AI 完全掌握每个阶段之前,探索程度就已经下降了。

下一张截图显示关闭动态训练、改用 Epsilon N 的最高分曲线。由于每个分数等级都有独立的 epsilon,Epsilon N 能维持局部探索。因此,AI 在进入下一阶段前可以逐步巩固学习成果,最高分曲线也更平滑、更加接近线性增长。

如上所示,传统 Epsilon Greedy 的进步较慢,最高分曲线较早趋于平坦。相比之下,Epsilon N 让 AI 分别掌握每个分数等级,从而保持稳步提升。
这个项目已经发布在 PyPI 上,你可以通过 pip 安装 AI Snake Lab。
python3 -m venv snake_venv
. snake_venv/bin/activate
激活 venv 虚拟环境之后:
pip install ai-snake-lab
在已激活的 venv 环境中执行:
ai-snake-lab
由于模拟运行在 Textual TUI 中,调整终端大小、重绘图表等操作可能轻微影响模拟时间。因此,即使重复运行,最高分也可能出现在略有差异的游戏编号上。这是预期行为,并不表示 AI 逻辑有问题。
如果你需要完全可重复的模拟运行,可以给我留言,我可以添加无界面模式,让模拟在 Textual 之外的独立进程中运行。
本项目最初基于 Patrick Loeber 的 YouTube 教程:Python + PyTorch + Pygame 强化学习:训练 AI 玩贪吃蛇。他的原始代码可以在 GitHub 上找到。感谢 Patrick!!!你太棒了!!!!本项目将原有 Pygame 和 Matplotlib 方案移植到了新的环境。
也感谢 Will McGugan 和 Textual 团队。Textual 真是个出色的框架。说到快速应用开发,从 Pygame + Matplotlib 移植到 Textual,居然不到一天就完成了。
创建一个 AI 智能体,让它自由尝试,再观察其表现,是一个令人惊叹的过程。有点像养育孩子,只是规模小得多、小得多、再小得多,至少今天还是如此!看 AI 驱动的贪吃蛇玩游戏,简直令人着迷。我总在想着还可以怎样改进它。感谢 Patrick Loeber 给了我一个探索 AI 的有趣项目。
我职业生涯的大部分时间都在担任 Linux 系统管理员,命令行是我的舒适区。我从未以程序员身份工作,更不用说前端开发人员了。Textual 这个用于构建丰富终端用户界面的框架,恰好适合我的风格。我第一次看到 Dolphie 时,简直惊呆了。内置、实时的 MySQL 指标图表,太精彩了!
Richard S. Sutton 也给了我很多启发。他对强化学习的思考是一场缓慢推进的革命。他批评现有 AI 领域过于专注于为特定任务设计专用 AI,完成任务就认为大功告成;我很认同这种看法。他关于能够持续进行非线性学习的 AI 智能体的愿景,仍是通往通用人工智能的重要前沿。
Some of you may have read my Git Battles post, where I talked about how I developed and a documented a Git workflow.
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