Multi-query optimization aimsat exploiting common sub-expressions to reduce evaluationcost. Multi-query optimization has often been viewed asimpractical, since earlier algorithms were exhaustive, andexplore a doubly exponential search space.This work demonstrates that multi-queryoptimization using heuristics ...
In general, the most advanced algorithms used to solve combinatorial optimization problems rely on handcrafted heuristics for making decisions which have high calculation costs, and the machine learning method looks like a natural candidate to solve such problems in a more principled and optimized way...
The,approach,presented,in this paper,is aimed,at,generating,a,single,plan.,exploiting,the,common,sub- expressions,that,can,be,detected,using,heuristics.,We,assume.,for the,purposes,of,this,paper. that,we,are,answering,queries,over,a deductive,database.,although,the,approach,is equally,...
Many existing approaches use heuristics, e.g., uniform seg- mentation [50, 43]. Similar to [38], we cast the problem as change-point detection, a more principled statistical method to find "changing moments" in a time-series sequence [1]. While [38] uses a kernel-based approach, we ...
Heuristics, such as the silhouette index or the gap statistic12, 13, are commonly used (e.g., in RaceID2). Other tools, such as BackSPIN, employ custom algorithms to arrive at a fixed number of k, while e.g., SC3 leaves the decision to the user. All of these approaches, however,...
Some techniques favor hacks, heuristics, and combinations of thereof with conventional optimization. All in all, none of these techniques is conclusive by any measure in the theory of optimization. Similarly, the best effort of the handcrafted code for efficient utilization of the hardware resources...
BI specifies that you want to spend less time in split generation as opposed to query execution. ETL specifies that you want to spend more time in split generation. HYBRID specifies a choice of the above strategies based on heuristics. HYBRID hive.exec.reducers.bytes.per.reducer The size per...
iOS17/ipadOS17 and tvOS17. It will also play on versions 14 to 16 but with less-optimized heuristics. Direct playback in Safari mobile is not a suitable option, as this browser still needs multiple improvements (bitrate up-switching, playhead positioning predictability, and drift compensat...
In addition, ASTRAL has introduced heuristics to enrich the set of allowable bipartitions [11] while keeping the size of the search space polynomial [12]. The restrictions imposed on DP are not to be confused with the related concept of user-imposed constrained inference (we use "restricted" ...
308: Refine the phrase list with heuristics. Each of these stages will now be discussed in further detail. (1) Initial Phrase Extraction The phrase identification server 250 generates 302 an initial list of phrases by iterating over each document in a set of documents, identifying candidate phra...