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【OpenClaw "瞒" 着我写的】论文解读|Attention Residuals:让模型学会"选择性遗忘"

【OpenClaw "瞒" 着我写的】论文解读|Attention Residuals:让模型学会"选择性遗忘"

在大型语言模型(LLM)中,残差连接(Residual Connections)是一个再平常不过的组件。但你有没有想过,这些残差连接真的在最优地工作吗?来自月之暗面(Moonshot AI)Kimi 团队的最新研究提出了 Attention Residuals(注意力残差),从根本上重新设计了深度学习模型中的信息传递方式。

一、研究背景:被忽视的残差连接问题

现代 LLM 普遍采用 PreNorm(Pre-Layer Normalization)架构,残差连接在其中扮演着两个关键角色:

  1. 1. 梯度高速公路:让梯度绕过各层直接反向传播
  2. 2. 信息聚合器:将所有前序层的输出进行加权求和

然而,第二个角色长期被忽视。传统残差连接采用固定单位权重(即简单相加)来聚合所有前序层的输出,这意味着:

  • • 每层对最终输出的贡献是均匀的
  • • 无法选择性强调或抑制特定层的贡献
  • • 随着网络加深,隐藏状态大小呈 O(L) 增长,导致PreNorm 稀释问题——早期层的信息被"埋藏"在深处,无法被后续层有效检索

二、研究动机:时间与深度的对偶性

研究者提出了一个深刻的观察:深度维度上的信息传递与时间维度上的序列建模存在对偶性

  • • RNN 在时间维度上曾面临类似的瓶颈:压缩所有历史信息到单一状态
  • • Transformer 通过注意力机制解决了这个问题,允许每个位置选择性访问所有历史位置
  • • Attention Residuals 将同样的思路应用到深度维度:让每层可以选择性聚合所有前序层的输出

三、方法创新

3.1 核心思想

传统残差:hl = hl-1 + f(hl-1)

Attention Residuals:hl = Σ αi→l · vi

其中 αi→l 是通过 softmax 注意力从可学习的伪查询计算得到的权重,实现了内容依赖的深度选择

3.2 Block AttnRes

全量 Attention Residuals 的内存开销为 O(Ld),对于大规模模型不实用。研究者进一步提出 Block AttnRes

  • • 将 L 层划分为 N 个块
  • • 块内使用标准残差连接
  • • 块间使用注意力机制聚合
  • • 内存开销降至 O(Nd),其中 N≈8 即可恢复大部分收益

3.3 系统优化

  • • 跨阶段缓存:消除流水线并行中的冗余通信
  • • 两阶段推理:通过在线 softmax 合并将推理开销降至 2% 以下

四、实验结果

4.1 扩展定律

  • • 在所有模型规模上持续优于基线
  • • Block AttnRes 达到与 1.25× 计算量相当的基线性能

4.2 下游任务表现

在 48B 参数模型(1.4T tokens 预训练)上的结果显示:

任务类型
基准表现
AttnRes 表现
提升
GPQA-Diamond
36.9
44.4
+7.5
Minerva Math
53.5
57.1
+3.6
HumanEval
59.1
62.2
+3.1
MMLU
73.5
74.6
+1.1

4.3 训练动态分析

  • • 输出幅度:AttnRes 将深度方向的幅度增长限制在每个块内,呈现有界周期性模式
  • • 梯度分布:梯度范数在各层间分布更加均匀

五、主要贡献总结

  1. 1. 理论创新:提出 Attention Residuals,将标准残差扩展为深度方向的 softmax 注意力
  2. 2. 系统优化:开发了 Block AttnRes 及配套的基础设施优化,使大规模训练成为可能
  3. 3. 实验验证:通过扩展定律、组件消融和下游基准测试的全面评估,证明了方法的有效性

六、存在的不足与未来方向

6.1 当前局限

  • • 块间注意力仍需显式保留块级表示,带来额外内存开销
  • • 伪查询是输入独立的,未来可探索输入依赖版本

6.2 未来改进方向

  • • 随着硬件互联改善,采用更细粒度的块大小或 Full AttnRes
  • • 探索更表达力强但内存高效(如线性复杂度)的注意力变体
  • • 与其他深度稳定技术(如深度监督、辅助损失)的组合

七、思考与启示

Attention Residuals 的核心启示是:不是所有的层都生而平等

传统残差连接对所有层一视同仁,但实际训练过程中,不同层学到的信息重要性各不相同。允许网络"选择性遗忘"不那么重要的早期表示,让更重要的信息更有效地传递到深层,这是提升深度网络性能的关键。

这一思路或许也能启发其他领域——无论是计算机视觉中的分层特征表示,还是多模态模型中的跨模态信息融合。


本文由 OpenClaw 辅助编写

论文来源:https://arxiv.org/abs/2603.15031

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  1. CONNECT:[ UseTime:0.000714s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000908s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000305s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000257s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000482s ]
  6. SELECT * FROM `set` [ RunTime:0.000228s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000560s ]
  8. SELECT * FROM `article` WHERE `id` = 480372 LIMIT 1 [ RunTime:0.000822s ]
  9. UPDATE `article` SET `lasttime` = 1774084942 WHERE `id` = 480372 [ RunTime:0.008733s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000231s ]
  11. SELECT * FROM `article` WHERE `id` < 480372 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000446s ]
  12. SELECT * FROM `article` WHERE `id` > 480372 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000370s ]
  13. SELECT * FROM `article` WHERE `id` < 480372 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001001s ]
  14. SELECT * FROM `article` WHERE `id` < 480372 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001136s ]
  15. SELECT * FROM `article` WHERE `id` < 480372 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001447s ]
0.097235s