Papers by Umberto Michieli
K-Merge: Online Continual Merging of Adapters for On-device Large Language Models (2026.acl-long)
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| Challenge: | Large Language Models (LLMs) are powerful general-purpose models that can be adapted to a wide range of problem types in many languages. |
| Approach: | They propose a method for on-device online continual merging to integrate new LoRAs when a new one becomes available. |
| Outcome: | The proposed approach outperforms other methods while adhering to storage budget constraints. |
On-device System of Compositional Multi-tasking in Large Language Models (2025.emnlp-industry)
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Ondrej Bohdal, Konstantinos Theodosiadis, Asterios Mpatziakas, Dimitrios Filippidis, Iro Spyrou, Christos Zonios, Anastasios Drosou, Dimosthenis Ioannidis, Kyenghun Lee, Jijoong Moon, Hyeonmok Ko, Mete Ozay, Umberto Michieli
| Challenge: | Existing approaches to generative AI for large language models struggle when executing complex tasks simultaneously. |
| Approach: | They propose a novel approach tailored specifically for compositional multi-tasking scenarios . they add a learnable projection layer on top of the combined summarization and translation adapters. |
| Outcome: | The proposed approach performs well and is fast in both cloud-based and on-device implementations. |
HydraOpt: Navigating the Efficiency-Performance Trade-off of Adapter Merging (2025.emnlp-main)
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| Challenge: | Existing methods that produce a fixed trade-off between storage size and performance are often ineffective due to the growing size of large language models. |
| Approach: | They propose a model merging technique that capitalizes on similarities between low-rank adapters to reduce storage costs and improve performance. |
| Outcome: | The proposed method significantly reduces storage size (48% reduction) while outperforms existing merging techniques in terms of performance (0.2-1.8% drop). |
Efficient Compositional Multi-tasking for On-device Large Language Models (2025.emnlp-main)
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| Challenge: | Adapter parameters provide a mechanism to modify the behavior of machine learning models and have gained significant popularity in the context of large language models (LLMs). |
| Approach: | They propose a benchmark for text-based compositional multi-tasking where multiple tasks are executed simultaneously. |
| Outcome: | The proposed method is optimized for on-device applications where computational resources are limited. |
Model Merging and Safety Alignment: One Bad Model Spoils the Bunch (2024.findings-emnlp)
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| Challenge: | Existing methods for merging large language models often overlook safety alignment during merging, leading to misaligned models. |
| Approach: | They propose to combine safety and domain-specific data to optimize model merging techniques . they propose to use this data to maximize model alignment . |
| Outcome: | The proposed method allows for models that excel in both domain expertise and alignment. |