By Catherine C. McGeoch
"Computational experiments on algorithms can complement theoretical research by means of displaying what algorithms, implementations, and speed-up equipment paintings most sensible for particular machines or difficulties. This booklet publications the reader during the nuts and bolts of the most important experimental questions: What should still I degree? What inputs should still I try out? How do I research the knowledge? Answering those questions wishes principles from set of rules design and research, working platforms and reminiscence hierarchies, and records and knowledge research. The wide-ranging dialogue contains a instructional on method clocks and CPU timers, a survey of recommendations for tuning algorithms and information buildings, a cookbook of tools for producing random combinatorial inputs, and an indication of variance relief suggestions. various case experiences and examples express find out how to observe those innovations. all of the worthy options in laptop structure and knowledge research are coated in order that the e-book can be utilized through someone who has taken a path or in information constructions and algorithms. A significant other web site, AlgLab (www.cs.amherst. edu/ccm/alglab) comprises downloadable records, courses, and instruments to be used in projects"-- Read more...
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Additional resources for A guide to experimental algorithmics
This design would require 49, 600 = 24 × 10 × 10 × 31 design points, totaling 496,000 random trials. Assuming average runtimes around 100 seconds per trial (as reported by Culberson and Luo ) the experiment should ﬁnish in 574 days, or just more than 18 months. This design is still too big. Additional factor-reduction strategies are needed to get this experiment down to reasonable size. Here are some general tactics for shrinking experimental designs, illustrated with SIG. As always, pilot experiments can provide the information needed to exploit these ideas.
2 Choosing Factors and Design Points The motivating question in an algorithmic experiment typically falls into one of these four broad categories. 1. Assessment. These experiments look at general properties, relationships, and ranges of outcomes. Is there a performance bottleneck in Greedy? What are the range and distribution of color counts for a given input class? What input properties affect performance the most? 2. The horse race. This type of experiment looks for winners and losers in the space of implementation ideas.
The workhorse study comprises experiments built upon precisely stated problems: Estimate, to within 10 percent, the mean comparison costs for data structures A and B, on instances drawn randomly from input class C; bound the leading term of the (unknown) cost function F (n). Designs for workhorse experiments require some prior understanding of algorithm mechanisms and of the test environment. This understanding may be gleaned from pilot experiments; furthermore, a great deal of useful intelligence – which ideas work and do not work, which input classes are hard and easy, and what to expect from certain algorithms – may be found by consulting the experimental literature.