Shahid Beheshti University Journal of Innovations in Computer Science and Engineering (JICSE) 2981-2135 2 Special Issue on AI 4 All - 1 2024 06 01 Improvement in intent detection and slot filling by model enhancement and different data augmentation strategies 7 14 105699 10.48308/jicse.2025.239716.1066 EN Mohammad Mahdi HajiRamezanAli Hasan Deldar ShahabDanesh University Qom, Pardisan, Iran Mohammad Mehdi Homayounpour ShahabDanesh University Qom, Pardisan, Iran Journal Article 2025 04 30 Abstract— Intent detection and slot filling are crucial for understanding human language and are essential for creating intelligent virtual assistants, chatbots, and other interactive systems that interpret user queries accurately. Recent advancements, especially in transformer-based architectures and large language models (LLMs), have significantly improved the effectiveness of intent detection and slot filling. This paper, proposes a method for effectively utilizing low volume fine-tuning data samples to enhance the natural language comprehension of lightweight language models, yielding a nimble and efficient approach. Our approach involves augmenting new data while increasing model layers to enhance understanding of desired intents and slots. We explored various synonym replacement methods and prompt-generated data samples created by large language models. To prevent semantic meaning disturbance, we established a lexical retention list containing non-O slots to preserve the sentence's core meaning. This strategy enhances the model's slot precision, recall, F1-score, and exact match metrics by 1.41%, 1.8%, 1.61%, and 3.81%, respectively, compared to not using it. The impact of increasing model layers was studied under different layer arrangement scenarios. Our results show that our proposed solution outperforms the baseline by 10.95% and 4.89% in exact match and slot F1-score evaluation metrics. https://jicse.sbu.ac.ir/article_105699_b01ee88141d331bdb464f78cc1932c09.pdf