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量化中的AI选股有那么神乎吗?

量化中的AI选股有那么神乎吗?

最近后台有朋友私信了几只量选产品,让帮忙看看。

风云君仔细研究了一下,发现有一类策略,在今年超额比较难做的行情下,它的波动明显更小、超额也更亮眼。

本来我以为会跟择时、对冲之类的子策略有关系。

结果细看发现,这类策略跟其他量选最大的不同,其实是选股模型用了机器学习,融入了些AI元素。

为啥会出现这种情况呢?

我们从两个选股模型聊起。

先说下传统的多因子选股。

在人工智能尚未普及的年代,传统多因子选股早已坐稳主流席位。

它依托经典金融投资理论,从最初单一依靠市场风险解释收益,逐步纳入市值、估值、盈利、动量等各类影响股价的要素,最终形成了完善的多因子体系。

所以传统多因子选股,简单来说就是资深投研团队依托实战经验,结合行业基本面、市场情绪,人工筛选有效投资因子,再根据市场变化划定因子权重。研究员依据个股综合因子得分筛选标的,兼顾风控要求,定期调整持仓,完成选股。

其优势在于策略逻辑清晰直白,透明度极高。每一步操作都有据可依,人工参与度高,所以策略可解释性强,策略稳定性更高。即便策略出现较大变动,也能精准归因、及时调整。

但随着市场迭代,这套模式的短板也暴露得愈发明显。

最核心的痛点,就是高度依赖人工经验,因子挖掘效率十分有限。研究员往往需要耗费大量时间精力,量化投研一度也因此被称为"血汗工厂"。

另外随着因子挖掘越来越充分,真正有效因子的挖掘难度越来越大,也导致各家因子同质化日趋严重,超额收益被大幅摊薄。

此外,传统多因子多采用线性思维,难以捕捉市场中隐性的一些联动关系。这就导致面对风格切换、行情震荡时,固定因子权重无法及时适配,超额收益增长空间受限,渐渐跟不上市场节奏。

随着大数据与人工智能发展,AI选股顺势崛起,成为量化行业突破瓶颈的新方向。

与传统多因子不同,AI选股跳出人工思维局限,不依赖预设因子,而是全盘吸纳各类数据——既包括行情、财报等结构化数据,也涵盖研报、舆情、产业动态等非结构化信息。

依托强大算法模型,AI能自主提炼有效投资特征、挖掘隐性信号,梳理数据间的非线性关联。整个策略运作过程中,模型会持续自我学习、跟随市场实时优化,这个过程无需人工频繁干预。

这套逻辑也让AI选股展现出诸多优势:

  • 第一,市场适配性极强,灵活度高。A股市场风格轮动快,时而偏向大盘价值,时而青睐成长小微盘,AI模型能直接从市场交易数据中察觉到这些变化,快速捕捉市场异动,第一时间调整选股偏向。

  • 第二,超额收益能力大幅升级。摆脱了人工挖因子的束缚,AI能够挖掘出海量多元化的投资信号,捕捉细碎定价偏差,长期下来与传统多因子的收益差距明显。

  • 第三,回撤把控更优。AI模型更能识别市场潜在风险信号,察觉市场恐慌情绪和资金出逃趋势,及时优化持仓结构,规避高波动、高危个股。在极端震荡行情里,能最大限度压缩净值回撤幅度,而在市场企稳后快速完成净值修复。

也因此,AI选股的超额曲线,与传统多因子选股存在比较明显的差异。

传统多因子的超额收益通常波动更大,呈周期性特征。尤其市场风格切换时,会出现明显回撤,适配行情下超额表现较强,但伴随资金堆积超额会出现衰减。

而AI选股因能直接从数据转化为交易信号,对市场适应性更强。风格切换时能及时调整持仓,因此回撤更小,市场有超额机会时,进攻性更强。

超额收益曲线更平滑、斜率更高,行情向好时快速冲高,调整阶段稳住底盘,整体韧更有韧性。

这也就很好理解,为什么AI属性更强的量化选股策略,面对行情剧烈扰动,净值波动会小很多。

当下,AI选股确实在强势崛起,但其门槛远超传统多因子。

一方面,算力投入巨大。就说头部量化机构幻方的“萤火二号”算力集群,2021年硬件投入就达10亿元,后续运维开支持续攀升,这对多数机构而言难以承受。

其次,数据源要求高,需手握全面优质的海量数据,同时配齐兼具金融经验与AI技术的复合型人才。

最后,AI的“黑箱”属性令人担忧,部分策略逻辑晦涩、收益难追溯,还易出现数据过拟合问题。这既是技术难点,也是投资人在布局AI量化产品时,必须重点甄别和规避的。

总的来说,传统多因子撑起了量化选股的基本盘,AI 选股是行业升级的大趋势,绝非空有热度的概念噱头。

当然,这也对管理人的综合实力提出了更高要求。

对我们投资人而言,下一阶段的关键,或许就在于能否找到真正有能力驾驭AI工具,并用透明、可解释的方式把超额做扎实的团队。

风云君也梳理了几个超额表现优异、运行良好、运用AI选股模型的量化策略私募,感兴趣的朋友,可以点击下方图片,添加风云君企微,领取详细资料。

#机器学习 #AI选股
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  1. CONNECT:[ UseTime:0.001083s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001600s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000715s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000691s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001312s ]
  6. SELECT * FROM `set` [ RunTime:0.000603s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001494s ]
  8. SELECT * FROM `article` WHERE `id` = 642457 LIMIT 1 [ RunTime:0.001023s ]
  9. UPDATE `article` SET `lasttime` = 1779234319 WHERE `id` = 642457 [ RunTime:0.090090s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.013402s ]
  11. SELECT * FROM `article` WHERE `id` < 642457 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002725s ]
  12. SELECT * FROM `article` WHERE `id` > 642457 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001841s ]
  13. SELECT * FROM `article` WHERE `id` < 642457 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002022s ]
  14. SELECT * FROM `article` WHERE `id` < 642457 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.018374s ]
  15. SELECT * FROM `article` WHERE `id` < 642457 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007096s ]
0.317906s