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Biologically motivated learning in neural networks with convolutional architectures [Elektronski vir] : magistrsko deloJelovčan, GašperUniverzalno dvosmerno aktivacijsko učenje (UBAL) je nov učni algoritem za umetne nevronske mreže, ki temelji na delovanju pravih bioloških nevronov. Namesto razširjanja napak za posodabljanje uteži ... uporablja lokalne aktivacijske vrednosti. Razširi kontrastno hebbijsko učenje, ki za posodobitve uporablja presinaptične in postsinaptične aktivacijske vrednosti. Je tudi dvosmerno, ker uporablja dve različni matriki uteži za vsako smer aktivacije. Zamisli za UBAL izvirajo iz predhodnih algoritmov recirkulacije in GeneRec. UBAL še nikoli ni bil izveden v konvolucijski različici, kar je glavni cilj magistrskega dela. Konvolucijske nevronske mreže so običajno primernejše za obdelavo slik, zato je bila naša hipoteza, da bo konvolucijski UBAL dal boljše rezultate tudi pri nalogi klasifikacije slik v primerjavi s sedanjo, popolnoma povezano različico. Konvolucijski UBAL smo implementirali in izvedli poskuse v programskem jeziku Python, in sicer v knjižnici Pytorch. Izvedbo smo preizkusili na znanem naboru podatkov MNIST. Rezultati so pokazali da smo bili uspešni in sicer z najboljšo klasifikacijsko točnostjo 89.678% v primerjavi z 91.05% točnostjo za nevronsko mrežo z algoritmom vzvratnega širjenja napake. Poleg konvolucijskega UBAL smo raziskali tudi vpliv ciljnega kodiranja na uspešnost mreže. Namesto eničnega kodiranja smo v izhodnih nevronih uporabili poenostavljene binarne slike števk. Naši rezultati kažejo, da nismo uspeli doseči boljše klasifikacije.Type of material - master's thesis ; adult, seriousPublication and manufacture - [G. Jelovčan], 2023 ; LjubljanaLanguage - englishCOBISS.SI-ID - 183335171
Author
Jelovčan, Gašper
Other authors
Malinovská, Kristína
Topics
Kognitivna znanost |
Univerzitetna in visokošolska dela |
UBAL |
nevronske mreže |
konvolucija |
MNIST |
UBAL |
neural networks |
convolution |
MNIST
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Jelovčan, Gašper | |
Malinovská, Kristína |
Source: Personal bibliographies
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