Challenge: Parameter-efficient fine-tuning (PEFT) is an effective method for adapting pre-trained language models to various tasks efficiently.
Approach: They propose a parameter-efficient fine-tuning framework that captures transferable knowledge as a weighted combination of adapters trained on source tasks.
Outcome: The proposed method yields stable improvements over full fine-tuning and knowledge transferring methods on a broad range of tasks over 17 datasets.

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Hit the Nail on the Head: Parameter-Efficient Multi-task Tuning via Human Language Intervention (2024.findings-emnlp)

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Challenge: Recent studies show that PEFT on small pre-trained language models improves multitasking capabilities.
Approach: They propose a multi-task learning framework that enables transfer of prior knowledge across tasks . they attach task descriptions to input samples and map them to task embeddings .
Outcome: The proposed method improves performance on a T5 model and in decoder-only models .
When does Parameter-Efficient Transfer Learning Work for Machine Translation? (2022.emnlp-main)

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Challenge: Prior work indicates that parametric fine-tuning methods may not work as well for machine translation (MT).
Approach: They propose to use parameter-efficient fine-tuning methods to adapt large pre-trained models while only tuning a small number of parameters.
Outcome: The proposed methods outperform full fine-tuning for many downstream tasks when the parameter budget corresponds to 10% of the model parameters.
Let the Expert Stick to His Last: Expert-Specialized Fine-Tuning for Sparse Architectural Large Language Models (2024.emnlp-main)

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Challenge: Existing studies on parameter-efficient fine-tuning (PEFT) for dense-architecture LLMs are lacking.
Approach: They propose an expert-specialized fine-tuning method that tunes the experts most relevant to downstream tasks while freezing the other experts.
Outcome: The proposed method matches or surpasses full-parameter fine-tuning.
Parameter-Efficient Routed Fine-Tuning: Mixture-of-Experts Demands Mixture of Adaptation Modules (2026.findings-eacl)

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Challenge: Existing Parameter-Efficient Fine-Tuning (PEFT) strategies that focus on specialized experts are not effective for Mixture-of-Experts (MoE).
Approach: They propose to integrate a dynamic routing mechanism among specialized experts in Mixture-of-Experts (MoE) .
Outcome: Extensive experiments on commonsense and math reasoning tasks validate the performance and efficiency of the proposed routed approach.
MoDE: Effective Multi-task Parameter Efficient Fine-Tuning with a Mixture of Dyadic Experts (2025.findings-naacl)

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Challenge: Recent efforts have explored mixtures of LoRA modules for multi-task settings, but this study reveals redundancy in the down-projection matrix of these architectures.
Approach: They propose a method to share down-projection matrix across tasks and employ atomic rank-one adapters coupled with routers that allow more sophisticated task-level specialization.
Outcome: The proposed method outperforms state-of-the-art models on a SNI benchmark and provides a practical solution for deploying lightweight models.
MoDULA: Mixture of Domain-Specific and Universal LoRA for Multi-Task Learning (2024.emnlp-main)

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Challenge: Recent advances in open-source Large Language Models (LLMs) have achieved notable successes in natural language processing.
Approach: They propose a Parameter Efficient Fine-Tuning paradigm for improved fine-tuning and parameter efficiency in multi-task learning.
Outcome: The proposed model outperforms existing methods on multi-task learning while reducing training costs by over 80% without losing general capability.
MoRE: A Mixture of Low-Rank Experts for Adaptive Multi-Task Learning (2025.findings-acl)

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Challenge: Recent advances in Large Language Models (LLMs) have revolutionized various domains, offering unprecedented performance across numerous tasks.
Approach: They propose a new Mixture of Low-Rank Experts (MoRE) for multi-task PEFT to improve performance of LLMs with fewer parameters.
Outcome: The proposed method improves performance over multiple tasks and no additional inference cost.
Parameter-efficient Weight Ensembling Facilitates Task-level Knowledge Transfer (2023.acl-short)

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Challenge: Recent studies show that large pre-trained language models can be adapted to particular tasks in a parameter-efficient manner.
Approach: They propose to use lightweight parameters to transfer them between tasks to obtain similarity between tasks.
Outcome: The proposed methods show an improvement of 5%8% over baselines and could largely facilitate task-level knowledge transfer.
Semantic are Beacons: A Semantic Perspective for Unveiling Parameter-Efficient Fine-Tuning in Knowledge Learning (2024.findings-acl)

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Challenge: Parameter-Efficient Fine-Tuning (PEFT) methods allow efficient adaptation of Large Language Models (LLMs) to various downstream tasks, but their effectiveness diminishes when downstream tasks require accurate learning of specific knowledge.
Approach: They propose a method that fine-tunes a limited number of model parameters while keeping the majority of original parameters fixed.
Outcome: The proposed method is able to perform on open-source large language models and validates the semantic challenge in PEFT.
Parameter-Efficient Fine-Tuning without Introducing New Latency (2023.acl-long)

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Challenge: Parameter-efficient fine-tuning of pre-trained language models has been demonstrated to be effective, but its inherent characteristics limit its performance.
Approach: They propose to generate a sparse mask in a task-agnostic manner by modifying only a small subset of existing parameters and adding new parameters.
Outcome: The proposed method surpasses existing methods on the GLUE benchmark by a significant margin.

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