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Journal : journal of applied data sciences

A Hybrid TF-IDF and Knowledge Graph-Enhanced Retrieval-Augmented Generation Framework with Large Language Models for Domain-Aware Question Answering Utami, Lilyani Asri; Rachmi, Hilda; Hidayatulloh, Syarif
Journal of Applied Data Sciences Vol 7, No 2: May 2026
Publisher : Bright Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47738/jads.v7i2.1136

Abstract

This study aims to develop a domain-aware legal Question-Answering (QA) system tailored for Indonesia’s Micro, Small, and Medium Enterprises (MSMEs) by proposing a hybrid Retrieval-Augmented Generation (RAG) framework that integrates Term Frequency–Inverse Document Frequency (TF-IDF), Knowledge Graph (KG), and Large Language Model (LLM) components. In this framework, TF-IDF contributes by performing lexical-level retrieval to identify the most relevant documents based on keyword weighting; the KG enriches this retrieval by providing semantic relationships among legal entities, enabling deeper contextual understanding; and the LLM generates coherent responses conditioned on both lexical and semantically grounded evidence. Together, these components work synergistically to strengthen factual grounding during retrieval and improve contextual reasoning during generation. Methodologically, the system processes a curated dataset of 1,400 legal question–answer pairs collected from national legal repositories, including legislation, government regulations, and MSME digitalization guidelines. The process includes text preprocessing, keyword extraction using TF-IDF, semantic enrichment through a KG that maps legal entities and their relationships, and answer generation via an LLM powered by the RAG pipeline. The system was evaluated using Precision, Recall, F1-Score, Bilingual Evaluation Understudy (BLEU), and Recall-Oriented Understudy for Gisting Evaluation (ROUGE) metrics, validated by five legal experts. Results show an accuracy improvement from 76.5% to 83.5% after integrating KG, with Precision of 0.853, Recall of 0.877, and F1-Score of 0.865. The generative evaluation yielded a BLEU score of 0.9276 and ROUGE-L of 0.9301, indicating strong linguistic and semantic alignment between system outputs and expert-authored references. The study concludes that this approach offers a practical foundation for building AI-based legal assistance tools and highlights future opportunities for expansion to other legal domains and multilingual RAG applications.
Co-Authors ., Anisa Abd Rahman, Aedah Abdul Latif Achiari, Hendra Adinata, Fitra Adryan Fitrayudha Afif, Ibnu Satria Fajar Al Agus Suyatno Ahiraf, Shidqul Azaim Ahmad MAULANA Ahmad Sinnun, Ahmad Akbar, Fadhel Virgiawan Amaliah, Nurmala Angelo Ishakputra, Jonathan Angelo, Jonathan Anik Maghfiroh Anisa Anisa Ansori, Yulian Anugrahayu, Aprilia Apitri, Siti Arief Budiman Arifin, Ogi Charist M Aryo Bronto, Danis Azzahro, Fatimah Camelia Sabata Dantje Kardana Natakusumah Deni Setiyawa Desky Saptadiaji Dhivari, Danang Dian Resha Agustina Diaspalasara, Nico Dodi Jaya Wardana Dody Ariawan Eko Surojo Ersa, Laila Eva Rahmawati Evi Roviati Fachry Abda El Rahman Fadillah, Muhammad Arief Feri Prasetyo H Firmansyah Firmansyah Firmansyah Putra Halimatushadyah, Ernie Hamdani, Hafiz Hardian Iskandar Helma Putri Kusuma Hendi Suhendi Hilda Rachmi Hutagalung, Henni Ibnatus Syarifah Ifahda Pratama Hapsari Irwan Darmawan Jaelani, Jaelani Joko Triyono Kartimi Kartimi Kartini, Aprilia Kiki Ari Suwandi kosasih Komariyatul Hasanah Lailil Muflikhah Larasaty, Past Novel Lilyani Asri Utami, Lilyani Asri Luthvansyach, Achmad Lutvansyach, Achmad Maria Shusanti Febrianti Maruloh, Maruloh Marzuki Marzuki MAULANA, ANAS Maulana, Andry Maya Saridewi Pascanawaty, Maya Saridewi Mohammad Alvan Fahmi Muhamad Agung Sedayu, Muhamad Agung Muhamad Agus sahbana Mustajab, Muhammad Amar Mu’alimin Mu’alimin Nadiya Khilmiyaturrosikнон Najmuddin, Najmuddin Nova Abil Isfian Nugroho, Eka Numan Musyaffa Nur Rohmah Nurajijah, Nurajijah Nurhavika, Nurhavika Nurul hayati Oktariyanto Nugroho, Eka Paduloh Paduloh Patyani, Enda PP, Bintang Pramudya Prasetyo Raharjo, Mugi Ramadhani, Nafi Ramadhani, Nilam Ratih Pratiwi Syurkawi Rifa’i, Muhamad Mastur Rifda Triani Mutmainah Rizal Setya Perdana Rizkiyawati, Rizkiyawati Rizky Agung Ferdiana Adam Robby Nurtresna sa'id, badar Sania Wahyu Ningrum Santy Fitnawati WN Sharqony, Muh Aly Sianturi, Nurli Dian Stefani Sidik Sidik Sigit Kamseno Siti Marlina Siti Marlina, Siti Siti Muyasaroh Siti Rahmatillah N.S Sitinjak, Jerico Siwi, Anastasia Solehun, Solehun Sopiyati, Sopiyati Syabhan, Kiromi Syarifah Ida Farida Telambanua, Merdiani Triyana, Ni Nyoman Triyono, Gandung Umma, Fauzan Khairo Ummu Radiyah, Ummu WITRIANA ENDAH PANGESTI WN, Shanty Fitnawati Wulandhani, Feni Yudi Ramdhani Yuli Widyastuti Yunisyaputra, Aji Zuleika, Adinda Putri