COGS 109 - Course Guide

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Department
Cognitive Science
Course
COGS 109
Professor
Vicente Malave
Semester
Summer

Description
COGS 109Course Study GuideSummer 2013Instructor Malave1LearningNowthatwevedonesomemachinelearningwritedownadefinitionofwhatlearningisThinkofthedigitsproblemandtemplatematchersMachineLearninglearningisrobustthesolutionissomethingthatshouldapplytootherconceptsLearningisnotmemorizationofdataInvolvestrainingandaccuratelyanalyzingnovelconceptsthemachinehasnotseenAboveallitshouldbeabletopredictTemplatematcherstheonlywaytogetanoutputfromthemachineisiftheoutputexactlymatchesanalreadytrainedinputThetemplatelooksforanexactmatchandifitgetsaninputthatmatchesthoseinputswillbeactivatedOtherwisethereisnosolutionTheproblemTemplatematchinghastobeonetooneforexactmatchingorthemachinewillnotworkTemplatematchingisnotgoodforthedigitsproblembecauseeveryonehasadifferentwayofhandwritingnumbersThefeaturesofhandwrittennumbersvarybetweenindividualsYouneedtoomanytemplatesalmostaninfiniteamounttofindanexactmatchThisiswhytemplatematcherscantlearntorecognizedigitshandwrittendigitsarealldifferentsomepeoplewrite2swithaloopsomedontsoyouwouldneedalotoftemplatestomatcheachinstanceRelatestothetheideaofagrandmothercellwhichsuggeststhatoneneuroncodesrespondstoonesingleperceptormemoryAtemplatematcherstypeofmachinehasaproblemwithreliabilityifthatneurondiestheresnomemoryofthattemplateThegrandmothercellexampleisliketemplatematchingEachneuronstoresonetypeofrepresentationlikeoneexampleofa7Ifthatneurondiesyoucannolongerrecognizethattypeof7HencewhyweneedtosolvethedigitproblemtobeabletoovercomethisandgeneralizeacrossallsevensortellthedifferencebetweenanydigitsinanyfonttiltetcThedigitsproblemEveryonehasadifferentwayofwritingdigitsThedigitproblemcannotbelearnedorovercomebytemplatematchingsincenotwohandwritingsarethesameThedigitproblemthusallowsustoseehowtheperceptronworkstolearntotellthedifferencebetweendigitsTemplatematchersonlyfireandgiveoutputiftheinputexactlymatcheswhattheyhaveseentheperceptroncantakeanyinputandalwaysgiveyousomesortofoutputresponseReflectbackonthecoursewhatdoyouthinkisorisnotlearnablebythesealgorithms
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