KDA(Kimi Delta Attention)
KDA(Kimi Delta Attention)
来自 Sebastian Raschka 的 The Big LLM Architecture Comparison。Kimi Linear 对 [[Gated DeltaNet]] 的精细改进。
一句话
KDA = 把 Gated DeltaNet 中的标量 gate 改成 channel-wise gate(每个 feature 通道独立):
- Gated DeltaNet:每 head 一个标量 gate 控制 memory decay
- KDA:每 head × 每 feature 通道 一个 gate,更精细地控制 memory 读写
→ 论文说能给 memory 更细的控制,改进长上下文 reasoning。
Kimi Linear 的整体结构
- 3 层 KDA + 1 层 MLA + gate 3:1 混合
- MLA(global)层用 [[NoPE(No Positional Embedding)|NoPE]],让 MLA 跑成纯 MQA
- RoPE 不在 MLA 层用,作者说”位置偏置由 KDA block 处理”
与 Qwen3-Next 的对比
| 维度 | Qwen3-Next | Kimi Linear |
|---|---|---|
| 线性层 | Gated DeltaNet(scalar gate) | KDA(channel-wise gate) |
| 全局层 | Gated GQA | MLA + gate |
| RoPE | 标准 | 在 MLA 层用 NoPE |
性能
Kimi Linear is as fast as GatedDeltaNet, and much faster than an architecture with multi-head latent attention (like DeepSeek V3/R1), while having a higher benchmark performance.
→ 在 long-context / reasoning benchmark 上linear but no accuracy drop。
图示

Figure 41: An overview of the linear attention hybrid architectures.

Figure 42: Qwen3-Next and Kimi Linear side by side.

Figure 43: Annotated figure from the Kimi Linear paper showing that Kimi Linear is as fast as GatedDeltaNet.
相关笔记
- [[Gated DeltaNet]]
- [[MLA(Multi-Head Latent Attention)]]
- [[NoPE(No Positional Embedding)]]
- [[Kimi 系列]] Kimi Linear
- [[Qwen3 系列]] Qwen3-Next
来源
The Big LLM Architecture Comparison, section 14.5 链接:https://magazine.sebastianraschka.com/p/the-big-llm-architecture-comparison