A very brief overview of deep learning

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1 Co-funded by the FP7 Programme of the A very brief overview of deep learning Maarten Grachten Austrian Research Ins tute for Ar ficial Intelligence Lrn2 Cre8 Learning to Create EUROPEAN UNION

2 Table of contents What is deep learning? Backpropaga on and beyond Selected deep learning topics for music processing 1

3 Deep learning There is no single defini on of deep learning, but most defini ons emphasize: Branch of machine learning Models are graph structures (networks) with mul ple layers (deep) Models are typically non-linear Both supervised and unsupervised methods are used for fi ng models to data 2

4 Deep learning There is no single defini on of deep learning, but most defini ons emphasize: Branch of machine learning Models are graph structures (networks) with mul ple layers (deep) Models are typically non-linear Both supervised and unsupervised methods are used for fi ng models to data 2

5 Deep learning There is no single defini on of deep learning, but most defini ons emphasize: Branch of machine learning Models are graph structures (networks) with mul ple layers (deep) Models are typically non-linear Both supervised and unsupervised methods are used for fi ng models to data 2

6 Deep learning There is no single defini on of deep learning, but most defini ons emphasize: Branch of machine learning Models are graph structures (networks) with mul ple layers (deep) Models are typically non-linear Both supervised and unsupervised methods are used for fi ng models to data 2

7 An example of deep models: Deep neural networks A neuron is a non-linear transforma on of a linear sum of inputs: y = f(w T x + b) An array of neurons taking the same input x form a new layer on top of the input in a neural network: y = f(w T x + b) Third layer: y 2 = f(w T 2 f(wt 1 x + b 1) + b 2 ) input x. 1 w 1j x 2 x 3.. ac va on y j. x n w nj 1 b j 3

8 An example of deep models: Deep neural networks A neuron is a non-linear transforma on of a linear sum of inputs: y = f(w T x + b) An array of neurons taking the same input x form a new layer on top of the input in a neural network: y = f(w T x + b) Third layer: y 2 = f(w T 2 f(wt 1 x + b 1) + b 2 ) input x. 1 w 1j 1 w 1j.. y j 1 x 2 ac va on x 3 w nj 1.. y j. w nj b j b j 1 1 x n 3

9 An example of deep models: Deep neural networks A neuron is a non-linear transforma on of a linear sum of inputs: y = f(w T x + b) An array of neurons taking the same input x form a new layer on top of the input in a neural network: y = f(w T x + b) Third layer: y 2 = f(w T 2 f(wt 1 x + b 1) + b 2 ) 3

10 Rela on to other machine learning approaches How is deep learning different from 80 s NN research? Training methods derived from probabilis c interpreta on of networks as genera ve models Greedy layer-wise training More powerful op miza on methods More compu ng power, larger data sets Feature design vs. feature learning The success of most machine learning approaches cri cally depends on appropriately designed features Deep learning reduces need for manual feature design: Models learn features as non-linear transforma ons of data Deep models learn hierarchies of features Unsupervised (pre) training prevents overfi ng 4

11 Rela on to other machine learning approaches How is deep learning different from 80 s NN research? Training methods derived from probabilis c interpreta on of networks as genera ve models Greedy layer-wise training More powerful op miza on methods More compu ng power, larger data sets Feature design vs. feature learning The success of most machine learning approaches cri cally depends on appropriately designed features Deep learning reduces need for manual feature design: Models learn features as non-linear transforma ons of data Deep models learn hierarchies of features Unsupervised (pre) training prevents overfi ng 4

12 What are deep models used for? Tasks Predic on classifica on, regression problems Predic on as part of model (output layer, input layer) Use model to obtain feature vectors for data, use any classifier for predic on (WEKA) Genera on e.g. facial expressions, gait, music Denoising of data Reconstruc on/comple on of par al data Genera on of new data by sampling Successful applica on domains Image: object recogni on, op cal character recogni on Audio: speech recogni on, music retrieval, transcrip on Text: parsing, sen ment analysis, machine transla on 5

13 What are deep models used for? Tasks Predic on classifica on, regression problems Predic on as part of model (output layer, input layer) Use model to obtain feature vectors for data, use any classifier for predic on (WEKA) Genera on e.g. facial expressions, gait, music Denoising of data Reconstruc on/comple on of par al data Genera on of new data by sampling Successful applica on domains Image: object recogni on, op cal character recogni on Audio: speech recogni on, music retrieval, transcrip on Text: parsing, sen ment analysis, machine transla on 5

14 What are deep models used for? Tasks Predic on classifica on, regression problems Predic on as part of model (output layer, input layer) Use model to obtain feature vectors for data, use any classifier for predic on (WEKA) Genera on e.g. facial expressions, gait, music Denoising of data Reconstruc on/comple on of par al data Genera on of new data by sampling Successful applica on domains Image: object recogni on, op cal character recogni on Audio: speech recogni on, music retrieval, transcrip on Text: parsing, sen ment analysis, machine transla on 5

15 Tradi onal learning in neural networks: Backpropaga on Given data D, define a loss func on on targets and actual output: L D (θ), for example: summed squared error between output and targets cross-entropy between output and targets Use gradient descent to itera vely find be er weights θ Compute the gradient of L with respect to θ, either: Batch gradient: L D (θ) Stochas c gradient: L d (θ) for d D Update w θ by subtrac ng α L w (α: learning rate) Con nue descent un l some stopping criterion, e.g.: Convergence of θ Early stopping (stop when error on valida on set starts to increase) 6

16 Limita ons of backpropaga on (BP) Does not scale well to deep networks (including recurrent networks): gradients further away from the outputs tend to either vanish or explode [Hochreiter and Schmidhuber, 1997] Likely to se le at (poor) local minima of the loss func on Since BP used to be the state-of-the-art training algorithm: limited success with deep neural networks 7

17 Limita ons of backpropaga on (BP) Does not scale well to deep networks (including recurrent networks): gradients further away from the outputs tend to either vanish or explode [Hochreiter and Schmidhuber, 1997] Likely to se le at (poor) local minima of the loss func on Since BP used to be the state-of-the-art training algorithm: limited success with deep neural networks L(θ) θ opt ˆθ BP 7

18 Limita ons of backpropaga on (BP) Does not scale well to deep networks (including recurrent networks): gradients further away from the outputs tend to either vanish or explode [Hochreiter and Schmidhuber, 1997] Likely to se le at (poor) local minima of the loss func on Since BP used to be the state-of-the-art training algorithm: limited success with deep neural networks L(θ) θ opt ˆθ BP 7

19 Limita ons of backpropaga on (BP) Does not scale well to deep networks (including recurrent networks): gradients further away from the outputs tend to either vanish or explode [Hochreiter and Schmidhuber, 1997] Likely to se le at (poor) local minima of the loss func on Since BP used to be the state-of-the-art training algorithm: limited success with deep neural networks L(θ) θ opt ˆθ BP 7

20 Modern approaches to train deep neural networks Long short term memory [Hochreiter and Schmidhuber, 1997] Specialized recurrent structure + gradient descent to explicitly preserve error gradients over long distances Training networks by second order op miza on Hessian-free training [Martens, 2010] Greedy layer-wise training [Hinton et al., 2006] Train layers individually, supervised or unsupervised Higher layers take as input the output from lower layers Layers o en trained as Restricted Boltzmann Machines or Autoencoders Data-specific models and training Convolu onal neural networks [Lecun et al., 1998] Dropout [Hinton et al., 2012] Randomly ignore hidden units during training Avoids overfi ng 8

21 Topics covered in following talks Recurrent Neural Networks Beat-tracking with LSTM (Sebas an Böck) Hessian-free training (Carlos Cancino) (Stacked) Autoencoders Learning binary codes for fast music retrieval (Jan Schlüter) (Stacked) Restricted Boltzmann Machines Speech/Music classifica on (Jan Schlüter) Learning tonal structure from melodies (Carlos Cancino) Convolu onal Neural Networks and dropout Onset detec on / Audio segmenta on (Jan Schlüter) High-dimensional aspects of CNNs (Karen Ullrich) 9

22 References I Hinton, G. E., Osindero, S., and Teh, Y. (2006). A fast learning algorithm for deep belief nets. Neural Computa on, 18: Hinton, G. E., Srivastava, N., Krizhevsky, A., Sutskever, I., and Salakhutdinov, R. (2012). Improving neural networks by preven ng co-adapta on of feature detectors. CoRR, abs/ Hochreiter, S. and Schmidhuber, J. (1997). Long Short-Term Memory. Neural Computa on, 9(8): Lecun, Y., Bo ou, L., Bengio, Y., and Haffner, P. (1998). Gradient-based learning applied to document recogni on. In Proceedings of the IEEE, pages Martens, J. (2010). Deep learning via hessian-free op miza on. In Proceedings of the 27th Interna onal Conference on Machine Learning (ICML-10), June 21-24, 2010, Haifa, Israel, pages

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