Component-Aware Differential Privacy for Federated Multilingual Speech-LLMs — Paper

Abstract

Per-layer differential privacy (DP) clipping improves gradient fidelity in federated learning by allocating per-matrix clipping budgets proportional to parameter count. We show that this recipe breaks for speech large language models (speech-LLMs), when the acoustic encoder and the language decoder differ by an order of magnitude in update norm. Single-pool per-layer methods suffer \emph{cross-component budget collapse}, dragging word error rate (WER) far from flat global clipping or collapsing training entirely. When the norm imbalance is milder, adaptive single-pool methods partially recover, confirming that collapse severity scales with the inter-component norm ratio. We empirically diagnose the root cause across six per-layer methods and three speech-LLM architectures. We then propose \emph{$\alpha$-split}, a two-pool allocation that normalises encoder and LLM parameters into independent pools, and show that joint $\ell_2$ sensitivity and the original $(\varepsilon,\delta)$-DP guarantee are unchanged. At architecture-calibrated $\alpha$, our method recovers WER utility compared to flat DP, while granting the encoder $4.47{\times}$ tighter per-component noise protection against speaker voice-based gradient-inversion attacks at only $+2.6\%$ LLM noise overhead.

Authors 3

Jordi Luque, Fernando L\'opez, Aleix Sant

Specification

Official page: arxiv.org/abs/2609.11762
Source:arXiv (Atom API + RSS)T1observed 5 h agohigh
Arxiv announce type: new
Source:arXiv (Atom API + RSS)T1observed 5 h agohigh
arXiv id: 2609.11762
Source:arXiv (Atom API + RSS)T1observed 5 h agohigh
Categories: cs.CL
Source:arXiv (Atom API + RSS)T1observed 5 h agohigh
PDF: arxiv.org/pdf/2609.11762
Source:arXiv (Atom API + RSS)T1observed 5 h agohigh
Primary category: cs.CL
Source:arXiv (Atom API + RSS)T1observed 5 h agohigh
Published: 11 Sept 2026
Source:arXiv (Atom API + RSS)T1observed 5 h agohigh

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9

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T19

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5 h ago

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None

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Authors: Jordi Luque, Fernando L\'opez, Aleix Sant

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Claim history for Primary category
Value	Valid from → to	Status	Source	Confidence	Extractor
cs.CL	11 Sept 2026 21:03 UTC → current	current	arXiv (Atom API + RSS)T1	high	deterministic

Claims are temporal and append-only: a new observation closes the previous claim (valid_to) instead of overwriting it. Conflicting claims from different sources are kept side by side and flagged — never averaged. Methodology →

11 Sept 2026
New paperPaperComponent-Aware Differential Privacy for Federated Multilingual Speech-LLMs
New paper: Component-Aware Differential Privacy for Federated Multilingual Speech-LLMs
arxiv
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Source documents
Source	Document	Type	Tier	Last observed	Snapshots
arXiv (Atom API + RSS)	rss.arxiv.org/rss/cs.CL	feed	T1· Official	4 h ago	1

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