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Jun-Kang Liu

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#machine learning Preprint Oct 2026

MuLoRA: Spectrally Balanced Low-Rank Adaptation for Continual Learning

Low-rank adaptation (LoRA) provides a parameter-efficient approach to continual learning, but its nominal rank can conceal a loss of effective adaptation capacity. We identify \emph{spectral plasticity collapse}: during sequential adaptation, update energy becomes concentrated in a small subset of singular modes, leavi...

Jun-Kang Liu · 0 citations
#artificial intelligence Preprint Oct 2026

FedMIX-P: Mixing Local and Global Preconditioners for Federated Vision and Language Model Training

Adaptive preconditioners accelerate model training, but heterogeneous client geometries can bias federated updates even when gradients are evaluated at the same model. Round-start synchronization alone cannot prevent this mismatch from reappearing during local training. We propose \texttt{FedMIX-P}, which mixes shared...

Jun-Kang Liu · 0 citations
#artificial intelligence Preprint Oct 2026

FedLore: Communication and Memory Efficient Federated Learning via Shared Gradient Low-Rank Projection

Federated training of foundation models is constrained by client memory and communication costs. LoRA-based methods reduce these costs through low-rank adapters, but their fixed rank budget can limit adaptation. Gradient low-rank optimization offers greater flexibility, yet independently chosen client subspaces create...

Jun-Kang Liu · 0 citations
Preprint Aug 2026

When Privacy Hurts Mergeability: Geometry-Aware Model Merging under Differential Privacy

Experiments on vision and language tasks across multiple privacy budgets show that DP-Merging consistently improves private merged-model performance while preserving the privacy guarantees of the underlying DP fine-tuning procedures.

Jin Liu, Jun-Kang Liu, Ning Xi et al. · 0 citations

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