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[Refactor] Rename NSA → DSA: user-facing aliases, file/class/import rename (#25821)

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Co-authored-by: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Cheng Wan
2026-05-20 00:18:04 -07:00
committed by GitHub
co-authored by Claude Sonnet 4.6
parent da6d549ab2
commit 8131641bc6
162 changed files with 11298 additions and 10740 deletions
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docs/advanced_features/attention_backend.md
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@@ -50,7 +50,7 @@ Multimodal attention is selected by `--mm-attention-backend`. The "MultiModal" c
```{note}
- FlashAttention 4 supports both prefill and decode on SM90 (Hopper) and SM100 (Blackwell). FA4 MLA supports `page_size = 1`; FA4 MHA requires `page_size = 128`. On SM100, this is auto-enforced by the server; on SM90, users must set `--page-size 128` manually.
- NSA is specifically designed for [DeepSeek V3.2 DSA](https://lmsys.org/blog/2025-09-29-deepseek-V32/). See the [DSA Attention Backend (NSA)](#dsa-attention-backend-nsa) section and [DeepSeek V3.2 deployment guide](../basic_usage/deepseek_v32.md) for details.
- DSA is specifically designed for [DeepSeek V3.2](https://lmsys.org/blog/2025-09-29-deepseek-V32/). See the [DSA Attention Backend](#dsa-attention-backend) section and [DeepSeek V3.2 deployment guide](../basic_usage/deepseek_v32.md) for details.
```
```{warning}
@@ -107,11 +107,11 @@ GDN models are hybrid: the full-attention layers still require a standard `--att
- **Other CUDA (Hopper, Ampere, etc.)**: auto-selection works; no special constraints.
```
### DSA Attention Backend (NSA)
### DSA Attention Backend
DSA (Deepseek Sparse Attention) is a native sparse attention mechanism used by [DeepSeek V3.2](https://lmsys.org/blog/2025-09-29-deepseek-V32/). It is activated automatically when the model architecture requires it and is selected via `--attention-backend nsa`.
DSA (Deepseek Sparse Attention) is a native sparse attention mechanism used by [DeepSeek V3.2](https://lmsys.org/blog/2025-09-29-deepseek-V32/). It is activated automatically when the model architecture requires it and is selected via `--attention-backend dsa` (the legacy alias `--attention-backend nsa` is deprecated and kept for one release).
Internally, the NSA backend dispatches to different sub-backends for prefill and decode phases. You can override these with `--nsa-prefill-backend` and `--nsa-decode-backend`:
Internally, the DSA backend dispatches to different sub-backends for prefill and decode phases. You can override these with `--dsa-prefill-backend` and `--dsa-decode-backend` (the `--nsa-prefill-backend` / `--nsa-decode-backend` aliases are deprecated):
| **Sub-backend** | **Prefill** | **Decode** | **Notes** |
|-----------------------|-------------|------------|-----------------------------------------------|