Challenge: Large language models are fine-tuned on diverse datasets to develop a range of skills . each skill has unique characteristics, and datasets are heterogeneous and imbalanced . a general, model-agnostic, reinforcement learning framework is proposed to optimize data usage .
Approach: They propose a general, model-agnostic, reinforcement learning framework that optimizes data usage automatically during the fine-tuning process.
Outcome: The proposed framework optimizes data usage automatically during the fine-tuning process.

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Fine-tuning Large Language Models with Limited Data: A Survey and Practical Guide (2026.tacl-1)

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Challenge: Pre-trained language models provide strong foundations, but effective adaptation under data scarcity requires efficient and efficient fine-tuning techniques.
Approach: They propose to review parameter-efficient fine-tuning techniques that lower training and deployment costs and domain and cross-lingual adaptation methods for both encoder and decoder models.
Outcome: The proposed techniques lower training and deployment costs, domain and cross-lingual adaptation methods, and model specialization strategies.
Mixture-of-LoRAs: An Efficient Multitask Tuning Method for Large Language Models (2024.lrec-main)

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Challenge: Instruction Tuning has the potential to stimulate or enhance specific capabilities of large language models.
Approach: They propose a mixture-of-LoRAs architecture which is a parameter-efficient tuning method designed for multi-task learning with LLMs.
Outcome: The proposed method can be iteratively adapted to a new domain, enabling quick domain-specific adaptation.
Demystifying Instruction Mixing for Fine-tuning Large Language Models (2024.acl-srw)

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Challenge: Instruction tuning is effective for aligning large language models with human instructions, but the procedure to optimizing the mixing of instruction datasets is still unclear.
Approach: They categorize instructions into three primary types: NLP downstream tasks, coding, and general chat.
Outcome: The proposed method improves performance of large language models (LLMs) but it is difficult to combine different instruction datasets to optimize overall performance.
MoA: Heterogeneous Mixture of Adapters for Parameter-Efficient Fine-Tuning of Large Language Models (2026.acl-long)

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Challenge: Existing methods for parameter-efficient fine-tuning (PEFT) are limited by computational costs and performance degradation.
Approach: They propose a method that integrates Low-Rank Adaptation and Mixture-of-Experts (MoE) they propose combining expert load imbalance and representation collapse to improve LLM performance .
Outcome: The proposed method outperforms homogeneous MoE-LoRA architectures in performance and parameter efficiency.
How Abilities in Large Language Models are Affected by Supervised Fine-tuning Data Composition (2024.acl-long)

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Challenge: supervised fine-tuning (SFT) is a technique used to enhance multiple abilities in large language models.
Approach: They propose to study the interplay of data composition between mathematical reasoning, code generation, and general human-aligning abilities during supervised fine-tuning.
Outcome: The proposed model improves math reasoning and code generation with increasing data amount . the proposed model size and SFT strategies can be used to learn multiple skills with different scaling patterns.
Fine-Grained Data Ordering Improves Fine-Tuning for Large Language Models (2026.findings-acl)

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Challenge: Prior work focused on data preprocessing, focusing on filtering and cleaning data . a study aimed to improve fine-grained scheduling of data order in epochs .
Approach: They propose a fine-grained scheduling method of data order in epochs to fill this gap . they define data difficulty based on relevance between data and model .
Outcome: The proposed method improves on pre-training and small-scale fine-tuning experiments 2.4% over baselines.
Rethinking Data Mixture for Large Language Models: A Comprehensive Survey and New Perspectives (2026.findings-eacl)

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Challenge: Existing methods for data mixture improve the generalization capability of large language models (LLMs) on downstream tasks.
Approach: They propose a fine-grained categorization of existing methods and propose three subtypes of offline and online methods.
Outcome: The proposed methods extend beyond offline and online classifications and highlight key challenges in the field of data mixture.
Learning to Perform Complex Tasks through Compositional Fine-Tuning of Language Models (2022.findings-emnlp)

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Challenge: Recent work on how to encode compositional task structure has been limited by semantic parsing and multihop reasoning for the purpose of Q&A.
Approach: They propose an approach to decomposing a target task into component tasks and fine-tuning smaller LMs on a curriculum of such component tasks.
Outcome: The proposed approach outperforms end-to-end learning even with equal data, and gets better as more component tasks are modeled.
Walia-LLM: Enhancing Amharic-LLaMA by Integrating Task-Specific and Generative Datasets (2024.findings-emnlp)

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Challenge: Low-resource languages are left behind due to the unavailability of resources.
Approach: They propose to integrate task-specific and generative datasets to improve language model performance for Amharic by fine-tuning an Amharican instruction fine-to-tuned model.
Outcome: The proposed model shows promising results in different NLP tasks and compares translated instruction datasets with the original model.
iTool: Reinforced Fine-Tuning with Dynamic Deficiency Calibration for Advanced Tool Use (2025.emnlp-main)

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Challenge: Synthesizing tool-use data through real-world simulations is effective for enhancing large language models (LLMs) however, training gains decay as synthetic data increases, and the model struggles to benefit from more synthetic data.
Approach: They propose an iterative reinforced fine-tuning strategy to improve LLMs with external tools to augment their capabilities.
Outcome: The proposed method achieves 13.11% better performance than the same-size base model and outperforms larger open-source and closed-source models.

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