Viola: A Topic Agnostic Generate-and-Rank Dialogue System

• URL: http://arxiv.org/abs/2108.11063v1
• Date: Wed, 25 Aug 2021 06:20:34 GMT
• Title: Viola: A Topic Agnostic Generate-and-Rank Dialogue System
• Authors: Hyundong Cho, Basel Shbita, Kartik Shenoy, Shuai Liu, Nikhil Patel, Hitesh Pindikanti, Jennifer Lee, Jonathan May
• Abstract summary: We present Viola, an open-domain dialogue system for spoken conversation. Viola fetches a batch of response candidates from various neural dialogue models. Viola's response ranker is a fine-tuned polyencoder that chooses the best response given the dialogue history.
• Score: 14.896200668918583
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present Viola, an open-domain dialogue system for spoken conversation that uses a topic-agnostic dialogue manager based on a simple generate-and-rank approach. Leveraging recent advances of generative dialogue systems powered by large language models, Viola fetches a batch of response candidates from various neural dialogue models trained with different datasets and knowledge-grounding inputs. Additional responses originating from template-based generators are also considered, depending on the user's input and detected entities. The hand-crafted generators build on a dynamic knowledge graph injected with rich content that is crawled from the web and automatically processed on a daily basis. Viola's response ranker is a fine-tuned polyencoder that chooses the best response given the dialogue history. While dedicated annotations for the polyencoder alone can indirectly steer it away from choosing problematic responses, we add rule-based safety nets to detect neural degeneration and a dedicated classifier to filter out offensive content. We analyze conversations that Viola took part in for the Alexa Prize Socialbot Grand Challenge 4 and discuss the strengths and weaknesses of our approach. Lastly, we suggest future work with a focus on curating conversation data specifcially for socialbots that will contribute towards a more robust data-driven socialbot.

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