An Ensemble Model with Ranking for Social Dialogue

Amanda Cercas Curry; Igor Shalyminov; Ioannis Papaioannou; Jose L. Part; Oliver Lemon; Ond\v{r}ej Du\v{s}ek; Verena Rieser; Xinnuo Xu; Yanchao Yu

An Ensemble Model with Ranking for Social Dialogue

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arxiv 1712.07558 v1 pith:AXI6EQ2J submitted 2017-12-20 cs.CL

Ioannis Papaioannou , Amanda Cercas Curry , Jose L. Part , Igor Shalyminov , Xinnuo Xu , Yanchao Yu , Ondřej Dušek , Verena Rieser

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Oliver Lemon

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classification cs.CL

keywords alexachallengecompetitiondialogueduringensemblefeedbackprize

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Open-domain social dialogue is one of the long-standing goals of Artificial Intelligence. This year, the Amazon Alexa Prize challenge was announced for the first time, where real customers get to rate systems developed by leading universities worldwide. The aim of the challenge is to converse "coherently and engagingly with humans on popular topics for 20 minutes". We describe our Alexa Prize system (called 'Alana') consisting of an ensemble of bots, combining rule-based and machine learning systems, and using a contextual ranking mechanism to choose a system response. The ranker was trained on real user feedback received during the competition, where we address the problem of how to train on the noisy and sparse feedback obtained during the competition.

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A response-selection chatbot trained as an ensemble of 100 deep reinforcement learning agents, each on a cluster of dialogues, outperforms a single DRL agent and a Seq2Seq baseline on Persona-Chat.

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