andrew-ng_machinelearning.pdf

《andrew-ng_machinelearning.pdf》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、DeepLearningAndrewNgThanksto:AdamCoates,QuocLe,BrodyHuval,AndrewSaxe,AndrewMaas,RichardSocher,TaoWangAndrewNgThistalkTheideaof“deeplearning.”Usingbrainsimulations,hopeto:-Makelearningalgorithmsmuchbetterandeasiertouse.-MakerevolutionaryadvancesinmachinelearningandAI.Ibe

2、lievethisisourbestshotatprogresstowardsrealAI.AndrewNgWhatdowewantcomputerstodowithourdata?Images/videoLabel:“Motorcycle”SuggesttagsImagesearch…SpeechrecognitionAudioSpeakeridentificationMusicclassification…WebsearchTextAnti-spamMachinetranslation…Machinelearningperform

3、swellonmanyoftheseproblems,butisalotofwork.Whatisitaboutmachinelearningthatmakesitsohardtouse?AndrewNgMachinelearningandfeaturerepresentationspixel1Learningalgorithmpixel2InputMotorbikesRawimage“Non”-Motorbikespixel2pixel1AndrewNgMachinelearningandfeaturerepresentations

4、pixel1Learningalgorithmpixel2InputMotorbikesRawimage“Non”-Motorbikespixel2pixel1AndrewNgMachinelearningandfeaturerepresentationspixel1Learningalgorithmpixel2InputMotorbikesRawimage“Non”-Motorbikespixel2pixel1AndrewNgWhatwewanthandlebarsFeatureLearningrepresentationalgor

5、ithmwheelE.g.,DoesithaveHandlebars?Wheels?InputMotorbikesRawimage“Non”-MotorbikesFeaturespixel2Wheelspixel1HandlebarsAndrewNgFeaturerepresentationsFeatureLearningRepresentationalgorithmInputAndrewNgComputervisionfeaturesSIFTSpinimageHoGRIFTTextonsGLOHAndrewNgAudiofeatur

6、esSpectrogramMFCCFluxZCRRolloffAndrewNgNLPfeaturesNamedentityrecognitionStemmingParserfeaturesComingupwithfeaturesisdifficult,time-consuming,requiresexpertknowledge.Whenworkingapplicationsoflearning,wespendalotoftimetuningthefeatures.PartofspeechAnaphoraOntologies(WordN

7、et)AndrewNgThe“onelearningalgorithm”hypothesisAuditoryCortexAuditorycortexlearnstosee[Roeetal.,1992]AndrewNgThe“onelearningalgorithm”hypothesisSomatosensoryCortexSomatosensorycortexlearnstosee[Metin&Frost,1989]AndrewNgLearninginputrepresentationsFindabetterwaytorepresen

8、timagesthanpixels.AndrewNgLearninginputrepresentationsFindabetterwaytorepresentaudio.AndrewNgFeaturelearningpr