NeurIPS 2020

### Meta Review

There was much discussion around the relationship with Tessler et al., which at first seemed quite close. I reached out to the authors for a clarification, as Reviewer 3 had omitted requesting it in their review. After this clarification, the reviewers decided that the work was indeed sufficiently novel and interesting. For the record, the reviewers unanimously appreciated receiving the author clarification (as, I can imagine, the authors appreciated sending it). However, that clarification itself was quite long (5 paragraphs). As I had not requested a specific word limit, I will take the blame for this, but I do encourage the authors to reply more tersely in the future, in the interest of fairness. Please consider the reviewers' updated reviews in your revisions.