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Instruction Tuning for Large Language Models: A Survey

(2308.10792)
Published Aug 21, 2023 in cs.CL , cs.AI , and cs.LG

Abstract

This paper surveys research works in the quickly advancing field of instruction tuning (IT), a crucial technique to enhance the capabilities and controllability of large language models (LLMs). Instruction tuning refers to the process of further training LLMs on a dataset consisting of \textsc{(instruction, output)} pairs in a supervised fashion, which bridges the gap between the next-word prediction objective of LLMs and the users' objective of having LLMs adhere to human instructions. In this work, we make a systematic review of the literature, including the general methodology of IT, the construction of IT datasets, the training of IT models, and applications to different modalities, domains and applications, along with an analysis on aspects that influence the outcome of IT (e.g., generation of instruction outputs, size of the instruction dataset, etc). We also review the potential pitfalls of IT along with criticism against it, along with efforts pointing out current deficiencies of existing strategies and suggest some avenues for fruitful research. Project page: github.com/xiaoya-li/Instruction-Tuning-Survey

Overview

  • Instruction Tuning (IT) is an advancement focused on refining LLMs to better follow human instructions, aligning their next-word prediction capabilities with explicit directive following.

  • IT involves constructing instruction datasets for supervised training, employing fine-tuning strategies to guide LLMs in producing outputs based on given instructions and inputs.

  • Models like InstructGPT and BLOOMZ, utilizing datasets such as Natural Instructions and FLAN, have shown qualitative improvements across various tasks through IT.

  • Challenges remain in IT, including the comprehensive coverage of desired behaviors in instructions and the genuine understanding of tasks by models. Future directions propose efficient tuning techniques like LoRA and Delta-tuning.

Introduction to Instruction Tuning

Instruction Tuning (IT) represents a pivotal advancement in the domain of LLMs, focused on refining these models to better adhere to human instructions. This process aligns the intrinsic next-word prediction paradigm of LLMs with the explicit directive-following desired by end-users. Through IT, a model is further trained on a dataset comprising instruction-output pairs in a supervised manner, thus narrowing the gap between the model's predictive behavior and the fulfillment of user intents.

Methodology Overview

The core of IT involves constructing instruction datasets, each entry composed of an instruction (a natural language directive), an optional input providing context, and a designated output correlatively following the instruction. Two primary methods for dataset construction have emerged: integrating annotated natural language data through transformation and generating outputs directly with LLMs for quick accumulation. IT employs a fine-tuning strategy on these constructed datasets, guiding LLMs to produce outputs sequentially based on given instructions and inputs.

Datasets and Models

Instruction Tuned models exhibit qualitative improvements across a spectrum of tasks by leveraging datasets like Natural Instructions, P3, FLAN, and others. These datasets differ in their construction methodologies, ranging from manual curation to generative approaches. Representative models such as InstructGPT and BLOOMZ demonstrate the efficacy of IT by showing notable performance boosts both in automatic evaluations and human-rated assessments, against their non-IT counterparts.

Multi-Modality and Domain-Specific Applications

IT extends beyond text to embrace multimodal data, including images, speech, and video. Datasets like MUL-TIINSTRUCT and PMC-VQA facilitate the exploration of IT in these domains. Similarly, domain-specific applications of IT span a wide array, from medical diagnosis with Radiology-GPT to creative writing assistance through models like CoPoet and Writing-Alpaca-7B.

Analysis and Future Directions

Despite the proven effectiveness of IT, challenges remain, particularly in crafting high-quality instructions covering desired behaviors comprehensively. Additionally, concerns arise regarding IT's scope of improvement being limited to tasks heavily featured in the training dataset. Moreover, the exploration into whether IT models genuinely grasp task specifics or merely the surface patterns warrants further examination.

Efficient tuning techniques such as LoRA and Delta-tuning offer promising directions to alleviate computational burdens, enabling the adaptation of LLMs with reduced parameter tuning. These methodologies underscore the potential of fine-tuning in low-rank subspaces and using optimal controllers for parameter updates, respectively.

Conclusion

Instruction Tuning emerges as a transformative approach in enhancing the capabilities and controllability of LLMs, tailoring them more closely to human instructions across a diverse range of tasks and modalities. While promising, the journey of IT, from dataset construction to technique development, points to an evolving landscape with vast potential for innovation, specifically in achieving deeper task comprehension and extending efficiency in fine-tuning practices. Future research directions could pivot towards addressing current limitations and exploring the untapped potential of IT in uncharted domains and applications.

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