CS231_斯坦福_Deep Learning_Fei-Fei Li

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CS231n: Convolutional Neural Networks for Visual Recognition
Mini-batch SGD Loop 1. Sample a batch of data 2. Forward prop it through the graph, get loss 3. Backprop to calculate the gradients 4. Update the parameters using the gradient output layer input layer hidden layer 1 hidden layer 2 Fei-Fei Li Andrej Karpathy Justin Johnson Lecture 7-3 27Jan2016 Parameter sga We covered: updates momentum sgd, nag momentum d-- adagrad nag badelt adagrad rmsprop rmsprop adam(not in this vis) we did not cover adadelta 5 100 80 60 40 60 100 120 Image credits: Alec Radford Fei-Fei Li Andrej Karpathy Justin Johnson Lecture 7-4 27Jan2016 Dropout Forces the network to have a redundant representation has an ear has a tail is furry X cat score has claws mischievous- look Fei-Fei Li Andrej Karpathy Justin Johnson Lecture 7-5 27Jan2016 Convolutional neural networks C3: f. maps 16@10x10 INPUT C1: feature maps S4: t. mans 1605x5 628x28 32x32 S2: f. maps 6@14X14 G5: layer F6: layerOUTPUT 10 Full connection Gaussian connections Convolutions Subsampling Convolutions subsampling Full connection LeNet-5, Le Cun 1980 Fei-Fei Li Andrej Karpathy Justin Johnson Lecture 7-6 27Jan2016 Electrical signal a bit of history from brain Recording electrode Visual area of brain Hubel wiese 1959 Stimulus RECEPTIVE FIELDS OF SINGLE NEURONES IN THE CATS STRIATE CORTEX 60 1962 RECEPTIVE FIELDS, BINOCULAR 40 INTERACTION AND FUNCTIONAL ARCHITECTURE IN THE CATS VISUAL CORTEX 10 1968. 0· Stimulus orientation(deg) Fei-Fei Li Andrej Karpathy Justin Johnson Lecture7-7 27Jan2016 Hierarchical organization Hubel weisel featural hierarchy topographical mapping ●●● hyper-complex high level cells complex cells mid level simple cells low level Fei-Fei Li Andrej Karpathy Justin Johnson Lecture 7-8 27Jan2016 Convolutional neural Networks (First without the brain stuff Fei-Fei Li Andrej Karpathy Justin Johnson Lecture7-9 27Jan2016 Convolution Layer 32X32X3 image 32 height 32 Width 3 depth Fei-Fei Li Andrej Karpathy Justin Johnson Lecture 7-10 27Jan2016

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