Towards a Human-like Open-Domain Chatbot

This paper presents the Meena chatbot trained as a 2.6B seq2seq model on 867M [context, response] pairs (341 GB of text, 40B words). Meena is shown to outperform recent industrial chatbots in a multi-turn open-domain setting, measured by their proposed human evaluation metric called Sensibleness and Specificity Average (SSA).


  • Though presented as a research paper, Meena is actually a good direction for industry too.
  • I’m looking forward to a breakthrough in graph encoders so that user profile can be easily integrated with these seq2seq models.
  • Usually seq2seq models have the same number of layers in encoders and decoders, why Evolved Transformer has so much less encoder layers (1 vs 13 decoder layers)?
  • 5: Transformative: This paper is likely to change our field. It should be considered for a best paper award.
  • 4.5: Exciting: It changed my thinking on this topic. I would fight for it to be accepted.
  • 4: Strong: I learned a lot from it. I would like to see it accepted.
  • 3.5: Leaning positive: It can be accepted more or less in its current form. However, the work it describes is not particularly exciting and/or inspiring, so it will not be a big loss if people don’t see it in this conference.
  • 3: Ambivalent: It has merits (e.g., it reports state-of-the-art results, the idea is nice), but there are key weaknesses (e.g., I didn’t learn much from it, evaluation is not convincing, it describes incremental work). I believe it can significantly benefit from another round of revision, but I won’t object to accepting it if my co-reviewers are willing to champion it.
  • 2.5: Leaning negative: I am leaning towards rejection, but I can be persuaded if my co-reviewers think otherwise.
  • 2: Mediocre: I would rather not see it in the conference.
  • 1.5: Weak: I am pretty confident that it should be rejected.
  • 1: Poor: I would fight to have it rejected.

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