Reviews: Joint Optimization of Tree-based Index and Deep Model for Recommender Systems

The results presented for this work beats the benchmarks by a good deal, and in particular, the online test results are very good. It is an incremental improvement to an existing model (TDM) by doing an additional optimization step. The resulting improvement is impressive, though, and it feels like this would be more applicable to an applied data science conference such as KDD or WWW. The explanation of TDM in Section 2.1 is helpful, but it would be even more helpful to have a direct comparison between the tree building steps between TDM and the new proposed method. For example, having a side-by-side comparison of Algorithms1 & 2 with its TDM predecessor would go a long way in understanding detailed differences.