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Towards a Human-like Open-Domain Chatbot

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arxiv 2001.09977 v3 pith:L3VWXRRY submitted 2020-01-27 cs.CL cs.LGcs.NEstat.ML

Towards a Human-like Open-Domain Chatbot

classification cs.CL cs.LGcs.NEstat.ML
keywords perplexitymeenamulti-turntrainedchatbotend-to-endevaluationhuman-like
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present Meena, a multi-turn open-domain chatbot trained end-to-end on data mined and filtered from public domain social media conversations. This 2.6B parameter neural network is simply trained to minimize perplexity of the next token. We also propose a human evaluation metric called Sensibleness and Specificity Average (SSA), which captures key elements of a human-like multi-turn conversation. Our experiments show strong correlation between perplexity and SSA. The fact that the best perplexity end-to-end trained Meena scores high on SSA (72% on multi-turn evaluation) suggests that a human-level SSA of 86% is potentially within reach if we can better optimize perplexity. Additionally, the full version of Meena (with a filtering mechanism and tuned decoding) scores 79% SSA, 23% higher in absolute SSA than the existing chatbots we evaluated.

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