Machine Learning is Fun!机器学习

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1、MachineLearningisFun!Haveyouheardpeopletalkingaboutmachinelearningbutonlyhaveafuzzyideaofwhatthatmeans?Areyoutiredofnoddingyourwaythroughconversationswithco-workers?Let’schangethat!Thisguideisforanyonewhoiscuriousaboutmachinelearningbuthasnoideawheretostart.Iimaginethere

2、arealotofpeoplewhotriedreading thewikipediaarticle,gotfrustratedandgaveupwishingsomeonewouldjustgivethemahigh-levelexplanation.That’swhatthisis.Thegoalisbeaccessibletoanyone — whichmeansthatthere’salotofgeneralizations.Butwhocares?IfthisgetsanyonemoreinterestedinML,thenm

3、issionaccomplished.Whatismachinelearning?Machinelearningistheideathattherearegenericalgorithmsthatcantellyousomethinginterestingaboutasetofdatawithoutyouhavingtowriteanycustomcodespecifictotheproblem.Insteadofwritingcode,youfeeddatatothegenericalgorithmanditbuildsitsownl

4、ogicbasedonthedata.Forexample,onekindofalgorithmisaclassificationalgorithm.Itcanputdataintodifferentgroups.Thesameclassificationalgorithmusedtorecognizehandwrittennumberscouldalsobeusedtoclassifyemailsintospamandnot-spamwithoutchangingalineofcode.It’sthesamealgorithmbuti

5、t’sfeddifferenttrainingdatasoitcomesupwithdifferentclassificationlogic.Thismachinelearningalgorithmisablackboxthatcanbere-usedforlotsofdifferentclassificationproblems.“Machinelearning”isanumbrellatermcoveringlotsofthesekindsofgenericalgorithms.TwokindsofMachineLearningAl

6、gorithmsYoucanthinkofmachinelearningalgorithmsasfallingintooneoftwomaincategories — supervisedlearning and unsupervisedlearning.Thedifferenceissimple,butreallyimportant.SupervisedLearningLet’ssayyouarearealestateagent.Yourbusinessisgrowing,soyouhireabunchofnewtraineeagen

7、tstohelpyouout.Butthere’saproblem — youcanglanceatahouseandhaveaprettygoodideaofwhatahouseisworth,butyourtraineesdon’thaveyourexperiencesotheydon’tknowhowtopricetheirhouses.Tohelpyourtrainees(andmaybefreeyourselfupforavacation),youdecidetowritealittleappthatcanestimateth

8、evalueofahouseinyourareabasedonit’ssize,neighborhood,etc,andwhatsimilarhouseshavesoldfor.Soyouwritedown