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Prompting Large Language Models for Recommender Systems: A Comprehensive Framework and Empirical Analysis (2401.04997v1)

Published 10 Jan 2024 in cs.IR
Prompting Large Language Models for Recommender Systems: A Comprehensive Framework and Empirical Analysis

Abstract: Recently, LLMs such as ChatGPT have showcased remarkable abilities in solving general tasks, demonstrating the potential for applications in recommender systems. To assess how effectively LLMs can be used in recommendation tasks, our study primarily focuses on employing LLMs as recommender systems through prompting engineering. We propose a general framework for utilizing LLMs in recommendation tasks, focusing on the capabilities of LLMs as recommenders. To conduct our analysis, we formalize the input of LLMs for recommendation into natural language prompts with two key aspects, and explain how our framework can be generalized to various recommendation scenarios. As for the use of LLMs as recommenders, we analyze the impact of public availability, tuning strategies, model architecture, parameter scale, and context length on recommendation results based on the classification of LLMs. As for prompt engineering, we further analyze the impact of four important components of prompts, \ie task descriptions, user interest modeling, candidate items construction and prompting strategies. In each section, we first define and categorize concepts in line with the existing literature. Then, we propose inspiring research questions followed by experiments to systematically analyze the impact of different factors on two public datasets. Finally, we summarize promising directions to shed lights on future research.

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Understanding the Application of LLMs in Recommender Systems

Introduction to LLMs as Recommenders

Recommender systems have become essential in helping users navigate through an overwhelming amount of content to find what truly interests them. These systems analyze user behavior and preferences to suggest items users might like. With the advent of LLMs, such as ChatGPT, a new potential has emerged for creating more sophisticated recommender systems. LLMs are equipped with a vast amount of world knowledge and language abilities, making it possible to understand and use text in ways that traditional models cannot. This overview examines how LLMs can be utilized as recommenders, discussing factors that influence their effectiveness.

Framework for LLMs in Recommender Systems

LLMs can be integrated into recommender systems in several ways: as stand-alone recommendation models that decide which items to recommend, as tools that extract semantic understanding from text to enhance traditional algorithms, or as simulators for generative agents in recommendation environments. The focus here is on their use as stand-alone recommendation models.

One must consider two crucial factors when it comes to prompting LLMs as recommenders: selecting the right LLM as a foundation model and the construction of prompts themselves. Open-source and closed-source LLMs each have their pros and cons, with closed-source models demonstrating higher capability in zero-shot performance. However, open-source models offer more flexibility as they can be fine-tuned with domain-specific data. Model architecture, parameter scale, and context length are additional attributes that influence an LLM's ability to make recommendations.

Prompt Engineering for LLM-Based Recommender Systems

The magic of prompting lies in crafting prompts that are clear and effectively tailor the innate abilities of an LLM to the task of making recommendations. This art requires addressing the nature of the task through careful task description, representing user interests appropriately, considering the nature and structure of candidate items, and applying strategic prompting strategies such as zero-shot and few-shot prompting or using specialized techniques like recency-focused or role-playing prompts. Each component of the prompt plays an essential role in guiding the LLM towards generating useful recommendations.

Empirical Analysis and Insights

Experiments on two public datasets revealed several insightful findings. Closed-source LLMs, especially the latest like GPT-4, display a robust ability for cold-start recommendations and can surpass certain traditional models. Open-source LLMs can also be fine-tuned for improvements but at the cost of computational efficiency.

Regarding prompt engineering, it is notable that recent item interaction holds significant weight, and prompts that emphasize recency tend to provide better results. LLMs still need explicit instructions to grasp user preferences; hence, adding summary generation of user profiles in prompts can aid in refining results. Interestingly, re-ranking candidates from traditional models with LLMs doesn’t always yield improvements, suggesting that the LLM's general knowledge can be harnessed more effectively in some contexts than in others.

Future Directions

The journey of using LLMs in recommender systems is just beginning. Research should move towards optimizing their efficiency for real-world applications, developing methods for knowledge distillation that retain the LLM's abilities in more nimble models, and expanding into multimodal recommendations. Moreover, fairness considerations and privacy issues are paramount, ensuring that LLMs are employed ethically and responsibly in an increasingly personalized digital experience.

In conclusion, LLMs have opened up a new horizon for recommender systems. While challenges remain, their advanced understanding and generation of natural language promise to revolutionize how systems understand and cater to individual user preferences.

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Authors (7)
  1. Lanling Xu (5 papers)
  2. Junjie Zhang (79 papers)
  3. Bingqian Li (3 papers)
  4. Jinpeng Wang (48 papers)
  5. Mingchen Cai (9 papers)
  6. Wayne Xin Zhao (196 papers)
  7. Ji-Rong Wen (299 papers)
Citations (22)
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