Before revision:  Our work extends the problem coverage to optimal sketched LRD, least-squares regression (LS), and ] k-means clustering . We improve sketch learning for all three problems and very significantly for LS and LRD: experimental performance increases by 12 %DIF < and 20\\%, respectively.
After revision:  Our work extends the problem coverage to optimal sketched LRD, least-squares regression (LS), and ] k-means clustering  %DIF < and 20\\%, respectively.