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走“AI 系统”, 还是“科学软件平台”--AI4S对话之八

走“AI 系统”, 还是“科学软件平台”--AI4S对话之八

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Q-9: 昨天提到的 world model,是做成“可微模型”(end-to-end 学),还是“模块化系统”(planner + simulators)?

可微模型 = 能对参数/输入求导、因此能用梯度方法高效训练的模型)

这个选择,会直接决定你是走“AI 系统”,还是“科学软件平台”

如果目标是真的能指导合成、而不是做一个漂亮的 demo,那我会很明确地说:

必须从“模块化系统(planner + simulators)”起步,逐步向“局部可微”演化而不是一上来就 end-to-end。

原因不在“技术偏好”,而在这个问题的物理结构

一、为什么“纯 end-to-end 可微”现在基本不成立

听起来很诱人:

material → synthesis path → success probability(全可微,一把训完)

但在这个问题上,它会卡在三个硬墙:

1. 你没有训练信号

end-to-end 需要:

·大量 (material, path, outcome) 数据

现实是:

·path 数据稀缺

·outcome noisy

·失败数据几乎没有

👉 结果就是:模型学到的是数据分布的幻觉,而不是因果结构

2. 不可微的现实世界

你的 pipeline 里有:

·实验(不可微)

·DFT(不可微 / 极慢)

·heuristic rules(离散)

你可以“假装可微”(用 surrogate),但:

误差会在多步规划中指数放大

3. 长链条 credit assignment 崩溃

合成路径是:

·10–50 steps 的序列

·成败取决于早期某一步

end-to-end 会遇到经典问题:

哪一步该被 blame / reward?

这在 RL 里都很难,更别说数据还这么差

二、为什么“模块化系统”是唯一现实起点

模块化的核心优势不是“工程好做”,而是:

你可以把“错误”局部化,而不是让它污染整个系统

典型结构你已经接近了:

·生成(proposal)

·规划(search)

·world model(多层)

·验证(simulation / experiment)

好处是:

1. 每一层可以独立改进

·生成模型错 → 不影响物理约束

·物理模型粗 → 不影响搜索策略

·planner 可以换(MCTS → heuristic)

2. 可以引入“硬约束”

比如:

·温度范围

·相图边界

·设备限制

这些在 end-to-end 里很难“强 enforce”,但在模块系统里是天然的。

3. 可以逐步接入真实世界

你可以:

·先用 simulation loop

·再接 lab

·再做闭环

而不是一次性赌一个巨模型。

三、但为什么“不能停在模块化”

如果你只停在 planner + rules + simulators,会出现一个问题:

系统永远停在“专家系统 + patch”阶段

表现为:

·规则越来越多(越来越脆)

·搜索效率很低

·无法泛化到新材料体系

四、真正的演化路径(关键 insight)

不是二选一,而是一个三阶段演化

Stage 1:模块化(必须)

·planner + heuristic + surrogate + 少量物理

·目标:系统能跑通(even if ugly)

Stage 2:局部可微(critical leap)

把某些模块变成:

learned differentiable components

比如:

·surrogate kinetics model(可微)

·policy network(引导 search)

·value function(评估路径)

👉 注意:不是 end-to-end,而是**“planner 内部可学习”**

这一步很像:

AlphaGo(不是 end-to-end,而是 policy + value + MCTS)

Stage 3:近似端到端(但带结构)

当你有:

·足够数据(尤其是失败)

·稳定 world model

可以开始:

learning-to-plan / differentiable planning

但仍然会保留:

·约束层

·物理校验

👉 本质是:

结构化 end-to-end,而不是裸 end-to-end

五、一个很实用的判断标准

你可以用这个问题判断路线是否靠谱:

如果我把 planner 拿掉,系统还能工作吗?

·如果“可以” → 你在做生成模型(危险)

·如果“完全不行” → 说明 planner 是核心(这是对的)

再问:

如果我把 learned components 拿掉,系统还能优化吗?

·如果“不能” → 说明你已经进入正确演化阶段

六、最容易踩的坑(很多团队会死在这)

1. 过早 end-to-end

·结果:demo 很惊艳,实验全失败

2. 过度规则化

·结果:系统越来越像 expert system

·无法扩展

3. 把“可微”当目标,而不是手段

可微的意义是:

让 learning 能进入 planning loop

不是为了“看起来像深度学习系统”。

一句话结论

从模块化系统起步,用可微模型逐步侵蚀 planner 内部,而不是试图一口气端到端。

注:AI生成的文章可能存在“幻觉”

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  1. CONNECT:[ UseTime:0.000533s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000859s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000389s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002690s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000555s ]
  6. SELECT * FROM `set` [ RunTime:0.000259s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000664s ]
  8. SELECT * FROM `article` WHERE `id` = 838783 LIMIT 1 [ RunTime:0.000750s ]
  9. UPDATE `article` SET `lasttime` = 1783306003 WHERE `id` = 838783 [ RunTime:0.013853s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000364s ]
  11. SELECT * FROM `article` WHERE `id` < 838783 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000395s ]
  12. SELECT * FROM `article` WHERE `id` > 838783 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000352s ]
  13. SELECT * FROM `article` WHERE `id` < 838783 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001415s ]
  14. SELECT * FROM `article` WHERE `id` < 838783 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000829s ]
  15. SELECT * FROM `article` WHERE `id` < 838783 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000682s ]
0.102001s