Deep learning for music, galaxies and plankton
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1 Deep learning for music, galaxies and plankton Sander Dieleman May 17,
2 I. Galaxies 2
3 3
4 4
5 The Galaxy Challenge: automate this classification process Competition on? model colour image predictions 5
6 The data: JPEG colour images dimensions: 424 x 424 train: images test: images 6
7 The solution: a convnet with 7 layers (RGB) 32 Max pooling = 20x Max pooling = 8x x 16 Max pooling = 2x maxout(2) 2048 maxout(2) 7
8 Shallow learning xn ɸn fθ(ɸn) yn training examples extracted features shallow model predictions 8
9 Deep learning xn fθk( fθ2(fθ1(xn))) yn training examples deep model predictions 9
10 Deep learning vs. traditional neural networks output layer hidden layer 10
11 Deep learning vs. traditional neural networks output layer hidden layers 11
12 Deep learning vs. traditional neural networks output layer hidden layers rectified linear units y = max(x, 0) 12
13 Deep learning vs. traditional neural networks output layer hidden layers 13
14 Convolutional neural networks local connectivity flatten translation invariance fully connected convolutional 14
15 The solution: a convnet with 7 layers (RGB) 32 Max pooling = 20x Max pooling = 8x x 16 Max pooling = 2x maxout(2) 2048 maxout(2) 15
16 Preprocessing: cropping and downsampling 424 x x x 69 16
17 Data augmentation: rotation, translation, rescaling, flipping, 17
18 Network architecture: exploiting rotation invariance 18
19 Network architecture: exploiting rotation invariance 19
20 Network architecture: exploiting rotation invariance 20
21 Training large CNNs requires GPU acceleration Intel Core i7 3930K at 3.2 GHz, 6 cores 32GB RAM NVIDIA GeForce GTX 680 2GB / 4GB (2x) 21
22 The filters learned in the first convolutional layer Red Green Blue 22
23 input layer 2 16x16 layer 1 40x40 pooling 2 8x8 layer 3 6x6 pooling 1 20x20 layer 4 4x4 pooling 4 2x2 23
24 input layer 2 16x16 layer 1 40x40 pooling 2 8x8 layer 3 6x6 pooling 1 20x20 layer 4 4x4 pooling 4 2x2 24
25 input layer 2 16x16 layer 1 40x40 pooling 2 8x8 layer 3 6x6 pooling 1 20x20 layer 4 4x4 pooling 4 2x2 25
26 input layer 2 16x16 layer 1 40x40 pooling 2 8x8 layer 3 6x6 pooling 1 20x20 layer 4 4x4 pooling 4 2x2 26
27 27
28 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 II. Plankton 38
39 Pieter Jonas Iryna Jeroen Lionel Sander Aäron 39
40 40
41 41
42 Preprocessing and data augmentation rescale zoom, rotate, translate, flip, shear, stretch 42
43 Network architecture based on OxfordNet 3x3 convolution 3x3 overlapping pooling, stride 2 fully connected layer Very Deep Convolutional Networks for Large-Scale Image Recognition, Simonyan & Zisserman, ICLR
44 Cyclic pooling
45 Cyclic pooling 3x3 convolution cyclic slicing 3x3 pooling, stride 2 cyclic pooling fully connected layer 45
46 Cyclic rolling
47 Pseudo-labeling averaged test set predictions... test set predictions from various models
48 Pseudo-labeling testing data + averaged test set predictions 0.33 training data + labels 0.67 larger training set! strong regularizing effect mixed training batch
49 Traditional CV features Image size in pixels Image moments (capturing size and shape) Haralick texture features 49
50 Model averaging: ensembling... 50
51 Model averaging: test-time augmentation quasi-random affine transformations... 51
52 Model averaging: bagging same networks retrained on different subsets... 52
53 Software and hardware Lots of GPUs Tesla K40 GeForce GTX 680 GeForce GTX 980 Theano + Lasagne Very fast prototyping through automatic differentiation and graph optimisations 53
54 Reservoir Lab Sander Dieleman Iryna Korshunova Lionel Pigou Pieter Buteneers 54
55 III. Music
56 Collaborative filtering: use listening patterns for recommendation + good performance - cold start problem many niche items that only appeal to a small audience 56
57 Content-based: use audio content and/or metadata for recommendation - worse performance + no usage data required Artist Title allows for all items to be recommended regardless of popularity 57
58 There is a large semantic gap between audio signals and listener preference genre mood popularity time audio signals lyrical themes location instrumentation 58
59 # listeners the long tail not enough data to recommend these songs! popular unpopular 59
60 # listeners rich get richer popularity 60
61 Latent factor models: project users and songs into the same latent space similar songs good recommendations dissimilar songs 61
62 Predict latent factors from music audio signals regression model audio signals 62
63 Qualitative evaluation: visualisation of predicted usage patterns (t-sne) 63
64 Qualitative evaluation: visualisation of predicted usage patterns (t-sne) 64
65 Qualitative evaluation: visualisation of predicted usage patterns (t-sne) 65
66 Qualitative evaluation: visualisation of predicted usage patterns (t-sne) 66
67 Qualitative evaluation: visualisation of predicted usage patterns (t-sne) 67
68 128 4x MP x MP x MP 512 mean max L Spectrograms (30 seconds) Latent factors global temporal pooling 68
69 Blog post:
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