- I wonder how crucial the annealing scheme from the last paragraph in Section 4 is. Especially when $\alpha$ is not decreased to $0$ I imagine this could induce a bias which may be so large that it outweighs the bias reductions attained by using IWAE in the first place. - The only other weakness is related to the clarity of the exposition, especially around the "OVIS_~" estimator (see further details below). ==== EDIT: 2020-08-24 ===== replaced "$\alpha$ is not increased to $1$" by "$\alpha$ is not decreased to $0$" as I had had a typo in this part of my review
- I wonder how crucial the annealing scheme from the last paragraph in Section 4 is. Especially when $\alpha$ is not decreased to $0$ I imagine this could induce a bias which may be so large that it outweighs the bias reductions attained by using IWAE in the first place.