第44章 馅饼!

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些规则,然后在候选方案里暴力搜索,效率很低,而且严重依赖老工程师的个人判断,人一走,经验就断了。”
    “如果估值函数写不出来……那能不能不写?”漆昊嘀咕了起来。
    蓝总挑了挑眉:“什么意思?”
    漆昊斟酌着措辞:“我是说,如果参数和结果之间的映射关系过于复杂,人工建模的成本太高甚至不可行,那有没有一种办法,直接从历史数据里,让某种数学结构自己去逼近这个未知的映射?”
    (本章未完,请点击下一页继续阅读)第44章馅饼!(第2/2页)
    “类似于……用数据去拟合一个万能的函数逼近器?”
    汪总忽然从沙发上直起身子,说:“你说的这个思路,在我们无人机领域其实已经在摸索了。”
    漆昊转头看向他。
    “我们做无人机飞控,传统方案是PID控制器,纯数学模型,很精确,但前提是你对飞行环境有完整的物理建模。”
    “不过这种方式在高原上不行,风场湍流的模式千变万化,气压密度随海拔非线性变化,经典控制理论的模型假设全崩了。”
    “后来我们有个工程师,也是数学背景出身,他提了一个大胆的想法,直接拿飞行数据喂进去,让系统自己学。”
    “学?”漆昊敏锐地抓住了这个词。
    “对,学。”汪总点头,“他搭了一个多层的数学结构,输入是飞行器当前的状态参数,姿态角、角速度、气压、风速,输出是四个旋翼的转速指令,中间有好几层……怎么说呢,你可以理解成一层一层的非线性变换。”
    “每一层做一次线性组合,然后过一个非线性激活,上万个参数,全靠数据去调整。”
    多层,非线性变换,函数逼近。
    漆昊脑子里仿佛有什么东西被推开了一道缝。
    “等一下,你是说,这种结构理论上可以逼近任意连续函数?”
    汪总愣了一下,随即笑了:“你的直觉很准,确实有一个数学定理,好像叫什么万能逼近定理,说的就是这个意思,只要中间层的节点足够多,这种结构可以以任意精度逼近任何连续函数。”
    “那华记那个基站选址问题,如果把历史选址数据整理出来,输入是地形参数、用户分布、遮挡数据,输出是信号覆盖质量的评估,也可以用这种结构去逼近那个未知的估值函数?”
    陈工点了点头:“思路是对的,事实上业界确实有人在做类似的尝试,学术界把这个方向叫叫机器学习,你刚才说的那种多层结构,通常被称为神经网络。”
    “不过我们的基站选址模型输入维度超过两百,网络训练到后面,梯度几乎归零,模型完全学不动。”
    漆昊听到这里有些想不明白了,他看到旁边有一块白板,就走过去,拿起笔写了起来。
    “假设网络有n层,每一层的激活函数是σ,那反向传播的时候,梯度要经过n次链式法则……十层网络,梯度衰减系数是0.25的十次方。“
    他在旁边写下结果:0.25≈0.0000009537。
    漆昊放下笔,转过身:“梯度没有消失,它只是在指数级衰减,这是激活函数选取带来的结构性缺陷,不是优化算法的问题。”
    老王在旁边看得连连点头。
    他这个学生说的确实没问题。
    汪总问道:“那怎么解?”
    “换激活函数。”
    陈工盯着那条折线,嘴唇动了动:“这么简单?”
    “数学上最优美的东西往往都简单,当然,这只是我的直觉,具体的收敛性证明还需要时间,但从梯度传播的角度看,这个方向应该是对的。”
    蓝总和汪总交换了一个眼神。
    蓝总先开了口,不再绕弯子:“漆昊同学,我直说了,华记和大飞最近在谈一个联合项目,华记负责地面基站侧的智能选址和资源调度,大飞负责低空无人机中继节点的自主飞控和航迹规划。”
    “两块业务看着不搭界,但核心瓶颈是同一个问题……”
    “在传统数学建模失效的复杂环境下,如何用数据驱动的方式替代人工经验。”漆昊接上了他的话。
    蓝总认可:“对,就是这个意思。”
    汪总从沙发上站了起来,难得正色道:“我说句实话,我们大飞有工程团队,华记有数据和算力,但两边都缺数学人才。”
    “今天见到了漆昊同学,我们算是有了底。”
    “你不只是能做数学推导,你还有工程直觉,梯度消失这个问题我们内部工程师也发现了,但他们的解决思路全是从工程调参的角度出发。”
    蓝总点点头,转身看向胡院长说:“胡院长,我们华记的技术委员会上周刚批了一笔专项预算,如果贵院愿意,我们华记可以出资800万,大飞出资400万,三方共同在数院成立一个智能计算与控制
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