Sun Dec 8th through Sat the 14th, 2019 at Vancouver Convention Center
This paper was reviewed by three expert reviewers and received two Accept and one Weak Accept recommendations. After rebuttal, all the three reviewers are positive about this paper, and agree that this paper is well written, well motivated and clearly presented. The experiments are also carefully conducted, and the results are convincing. The biggest concern at the beginning was raised by R3, who questioned about the context of the results, runtimes and the trade-off between computational cost and performance. The rebuttal successfully addresses R3's concerns. Therefore, the AC recommends accepting the paper.