Computer Science Genetic Algorithms8/23/20011 Applications Boeing 777 engines designed by GE I2 technologies ERP package uses Gas John Deere – manufacturing.

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Presentation transcript:

Computer Science Genetic Algorithms8/23/20011 Applications Boeing 777 engines designed by GE I2 technologies ERP package uses Gas John Deere – manufacturing optimization US Army – Logistics Cap Gemini + KiQ – Marketing, credit, and insurance modeling

Computer Science Genetic Algorithms8/23/20012 Niche Poorly-understood problems –Non-linear, Discontinuous, multiple optima,… –No other method works well Search, Optimization, Machine Learning Quickly produces good (usable) solutions Not guaranteed to find optimum

Computer Science Genetic Algorithms8/23/20013 History 1970’s, John Holland – Adaptation in Natural and Artificial Systems –Natural Selection is a great search/optimization algorithm –Crossover plays an important role in this search/optimization –Fitness evaluated on candidate solution –Operators work on an encoding of solution

Computer Science Genetic Algorithms8/23/20014 History 1989, David Goldberg – our textbook –Consolidated body of work in one book –Provided examples and code –Readable and accessible introduction 2001, GECCO – 01, 600 attendees –Industrial use of Gas –Combinations with other techniques

Computer Science Genetic Algorithms8/23/20015 Genetic Algorithms Model Natural Selection the process of Evolution Search through a space of candidate solutions Work with an encoding of the solution Non-deterministic (not random) Parallel search

Computer Science Genetic Algorithms8/23/20016 Search Combination lock –30 digit combination lock –How many combinations?

Computer Science Genetic Algorithms8/23/20017 Search techniques Random/Exhaustive Search –How many must you try before p(success)>0.5 ? –How long will this take? –Will you eventually open the lock?

Computer Science Genetic Algorithms8/23/20018 Search techniques Hill Climbing/Gradient Descent –You are getting closer OR You are getting further away from correct combination –Quicker –Distance metric could be misleading –Local hills

Computer Science Genetic Algorithms8/23/20019 Search techniques Parallel hillclimbing –Everyone has a different starting point –Perhaps not everyone will be stuck at a local optima –More robust, perhaps quicker

Computer Science Genetic Algorithms8/23/ Genetic Algorithms Parallel hillclimbing with information exchange among candidate solutions Population of candidate solutions Crossover for information exchange Good across a variety of problem domains