[BugFix] fix all reduce fusion accurate issue

[BingooYang]

Motivation

修复同时开启 export FD_USE_PHI_RMSNORM=1 和 --enable-flashinfer-allreduce-fusion 引起的精度问题

Modifications

开启 export FD_USE_PHI_RMSNORM=1 环境变量，RMSNorm其中一个分支适配 all reduce fusion

Usage or Command

NA

Accuracy Tests

done

Checklist

• Add at least a tag in the PR title.
  • Tag list: [[FDConfig],[APIServer],[Engine], [Scheduler], [PD Disaggregation], [Executor], [Graph Optimization], [Speculative Decoding], [RL], [Models], [Quantization], [Loader], [OP], [KVCache], [DataProcessor], [BugFix], [Docs], [CI], [Optimization], [Feature], [Benchmark], [Others], [XPU], [HPU], [GCU], [DCU], [Iluvatar], [Metax]]
  • You can add new tags based on the PR content, but the semantics must be clear.
• Format your code, run pre-commit before commit.
• Add unit tests. Please write the reason in this PR if no unit tests.
• Provide accuracy results.
• If the current PR is submitting to the release branch, make sure the PR has been submitted to the develop branch, then cherry-pick it to the release branch with the [Cherry-Pick] PR tag.

[paddle-bot]

Thanks for your contribution!

[PaddlePaddle-bot]

🤖 Paddle-CI-Agent | ci_status_monitor | 2026-05-26 13:09:23

CI报告基于以下代码生成（30分钟更新一次）:

• PR commit: db01455
• Merge base: f23586e (branch: develop)
• 查看完整 Diff
• CI 详情

---

1 任务总览

Required 任务已全部通过，建议通过；当前仅有 3 个 Optional 任务失败，不阻塞合并，可按需关注。

总执行（rerun次数）	总任务	✅ 通过	❌ 失败	⏳ 运行中	⏸️ 等待中	跳过
41(0)	41	38	3	0	0	0

2 任务状态汇总

日志列说明：失败任务直接使用 CI 日志链接；运行中任务使用 Job 链接。

2.1 Required任务 : 10/10 通过

必选任务阻塞合并，失败需优先处理。

状态	任务	耗时	根因	修复建议	日志	重跑
✅	其余 10 个必选任务通过	-	-	-	-	-

2.2 可选任务 — 28/31 通过

可选任务不阻塞合并，失败仅供参考。

状态	任务	耗时	日志	重跑
❌	Run iluvatar Tests / run_iluvatar_cases	1m51s	Job	-
❌	CI_HPU	1h57m	Job	-
❌	Trigger Jenkins for PR	1m53s	Job	-
✅	其余 28 个可选任务通过	-	-	-

---

3 失败详情（仅 required）

无 required 失败任务。

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop@f23586e). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
fastdeploy/model_executor/layers/normalization.py	75.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #7923   +/-   ##
==========================================
  Coverage           ?   63.80%           
==========================================
  Files              ?      467           
  Lines              ?    64969           
  Branches           ?     9963           
==========================================
  Hits               ?    41451           
  Misses             ?    20713           
  Partials           ?     2805           

Flag	Coverage Δ
GPU	72.88% <75.00%> (?)
XPU	7.07% <0.00%> (?)

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[K11OntheBoat]

LGTM