Combining Knowledge Graphs and Large Language Models

Combining Knowledge Graphs and Large Language Models

9 Jul 2024 | Amanda Kau, Xuzeng He, Aishwarya Nambissan, Aland Astudillo, Hui Yin, Amir Aryani
The paper "Combining Knowledge Graphs and Large Language Models" by Amanda Kau explores the integration of large language models (LLMs) and knowledge graphs (KGs) to enhance the capabilities of both technologies. LLMs, such as BERT and GPT, have significantly advanced natural language processing (NLP) applications, but they still face limitations like hallucinations and lack of domain-specific knowledge. KGs, structured data formats that capture relationships between entities, can address these issues by providing structured and interpretable knowledge. The paper reviews 28 papers on methods for KG-powered LLMs, LLM-based KGs, and hybrid approaches, analyzing their key trends, techniques, and challenges. The introduction highlights the rapid advancements in NLP driven by large datasets and computational power, leading to the development of powerful LLMs. However, these models often suffer from hallucinations and lack of domain-specific knowledge. KGs, with their structured and interpretable nature, offer a solution by providing external facts and enhancing LLMs' performance in various tasks. The background section explains the architecture and applications of LLMs and KGs, emphasizing their roles in text generation, translation, and reasoning. LLMs are based on transformer architectures, while KGs are directed graphs representing entities and relationships. The construction of KGs involves knowledge acquisition, refinement, and evolution, often using crowdsourcing or text mining methods. The paper then delves into three main categories of approaches: 1. **LLMs Empowered by KGs**: Techniques that inject KG knowledge into LLM prompts, enhance explainability, and add semantic understanding. 2. **KGs Empowered by LLMs**: Methods where LLMs support KG construction and temporal forecasting. 3. **Hybrid Approaches**: Integrated methods that combine text and KG embeddings to improve performance in tasks like entity typing and visual question answering. A thematic analysis categorizes models into "Add-ons" and "Joint" approaches, highlighting the benefits of each. The strengths and limitations of existing research are discussed, including improved performance, interpretability, and the challenges of limited domain availability, computational costs, and outdated knowledge. The conclusion emphasizes the potential of combining KGs and LLMs to create more reliable and context-aware AI systems, while also noting ongoing challenges such as low effectiveness in knowledge integration and the need for smaller, more efficient integrated models. The paper suggests future research directions, including multimodal LLMs and improved knowledge integration techniques.The paper "Combining Knowledge Graphs and Large Language Models" by Amanda Kau explores the integration of large language models (LLMs) and knowledge graphs (KGs) to enhance the capabilities of both technologies. LLMs, such as BERT and GPT, have significantly advanced natural language processing (NLP) applications, but they still face limitations like hallucinations and lack of domain-specific knowledge. KGs, structured data formats that capture relationships between entities, can address these issues by providing structured and interpretable knowledge. The paper reviews 28 papers on methods for KG-powered LLMs, LLM-based KGs, and hybrid approaches, analyzing their key trends, techniques, and challenges. The introduction highlights the rapid advancements in NLP driven by large datasets and computational power, leading to the development of powerful LLMs. However, these models often suffer from hallucinations and lack of domain-specific knowledge. KGs, with their structured and interpretable nature, offer a solution by providing external facts and enhancing LLMs' performance in various tasks. The background section explains the architecture and applications of LLMs and KGs, emphasizing their roles in text generation, translation, and reasoning. LLMs are based on transformer architectures, while KGs are directed graphs representing entities and relationships. The construction of KGs involves knowledge acquisition, refinement, and evolution, often using crowdsourcing or text mining methods. The paper then delves into three main categories of approaches: 1. **LLMs Empowered by KGs**: Techniques that inject KG knowledge into LLM prompts, enhance explainability, and add semantic understanding. 2. **KGs Empowered by LLMs**: Methods where LLMs support KG construction and temporal forecasting. 3. **Hybrid Approaches**: Integrated methods that combine text and KG embeddings to improve performance in tasks like entity typing and visual question answering. A thematic analysis categorizes models into "Add-ons" and "Joint" approaches, highlighting the benefits of each. The strengths and limitations of existing research are discussed, including improved performance, interpretability, and the challenges of limited domain availability, computational costs, and outdated knowledge. The conclusion emphasizes the potential of combining KGs and LLMs to create more reliable and context-aware AI systems, while also noting ongoing challenges such as low effectiveness in knowledge integration and the need for smaller, more efficient integrated models. The paper suggests future research directions, including multimodal LLMs and improved knowledge integration techniques.
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