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Evaluating Large Language Model-based Natural Language Generation for Modular Dialog systems

While many dialogue systems currently use end-to-end solutions, modular systems offer greater control, sustainability, and more human-like dialogue. This makes them relevant especially when aiming to study human behavior patterns in interactions or applying them to sensitive domains. In this paper, we develop an automated metric to measure the quality of an LLM-based NLG-component in a modular system based on the hallucination tendency and linguistic quality. We apply the metric to various language models and usage techniques and, based on the results, discuss the conditions a model must meet in order to be a good candidate for an NLG-component in a real-time capable dialogue system. Although such automated metrics cannot replace a real interaction study, they help to compare potential approaches of the individual modules. Therefore, they are indispensable when developing and testing modules in isolation. One advancement of the introduced metrics is that it is developed and tested on a German dataset, showing challenges when working with languages other than English and discrepancies to the abilities of Generative AI assumed in current state-of-the-art literature.