IMPLEMENTING DEEP LEARNING USING CUDNN 이예하 VUNO INC.
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1 IMPLEMENTING DEEP LEARNING USING CUDNN 이예하 VUNO INC.
2 CONTENTS Deep Learning Review Implementation on GPU using cudnn Optimization Issues Introduction to VUNO-Net
3 DEEP LEARNING REVIEW
4 BRIEF HISTORY OF NEURAL NETWORK ADALINE XOR Problem Multi-layered Perceptron (Backpropagation) SVM Deep Neural Network (Pretraining) Perceptron Golden Age Dark Age ( AI Winter ) Electronic Brain S. McCulloch - W. Pitts F. Rosenblatt B. Widrow - M. Hoff M. Minsky - S. Papert D. Rumelhart - G. Hinton - R. Wiliams V. Vapnik - C. Cortes G. Hinton - S. Ruslan Adjustable Weights Weights are not Learned Learnable Weights and Threshold XOR Problem Solution to nonlinearly separable problems Big computation, local optima and overfitting Limitations of learning prior knowledge Kernel function: Human Intervention Hierarchical feature Learning
5 MACHINE/DEEP LEARNING IS EATING THE WORLD!
6 BUILDING BLOCKS Restricted Boltzmann machine Auto-encoder Deep belief Network Deep Boltzmann machine Generative stochastic networks Recurrent neural networks Convolutional neural netwoks
7 CONVOLUTIONAL NEURAL NETWORKS LeNet-5 (Yann LeCun, 1998)
8 CONVOLUTIONAL NEURAL NETWORKS Alex Net (Alex Krizhevsky et. al., 2012) GoogleNet (Szegedy et. Al., 2015)
9 CONVOLUTIONAL NEURAL NETWORKS Network Softmax Layer (Output) Forward Pass Forward Pass Backward Pass Layer Fully Connected Layer Pooling Layer Convoluti on Layer Input / Output Weights Neuron activation
10 FULLY CONNECTED LAYER - FORWARD Matrix calculation is very fast on GPU cublas library
11 FULLY CONNECTED LAYER - BACKWARD Matrix calculation is very fast on GPU Element-wise multiplication can be done efficiently using GPU thread
12 CONVOLUTION LAYER - FORWARD w1 w3 x1 x4 x7 w1 w1 w3 w3 w2 w2 y1 y3 w2 w4 x2 x5 x8 w4 w1 w4 w1 w3 w3 w2 w2 y2 y4 x3 x6 x9 w4 w4
13 CONVOLUTION LAYER - BACKWARD w1 w3 x1 x4 x7 w1 w1 w3 w3 w2 w2 y1 y3 w2 w4 x2 x5 x8 w4 w1 w4 w1 w3 w3 w2 w2 y2 y4 x3 x6 x9 w4 w4
14 CONVOLUTION LAYER - BACKWARD Error x1 x4 x7 L L Gradient x2 x5 x8 w 1 L w 3 L w 2 w 4 x3 x6 x9
15 HOW TO EVALUATE THE CONVOLUTION LAYER EFFICIENTLY? Both Forward and Backward passes can be computed with convolution scheme Lower the convolutions into a matrix multiplication (cudnn) There are several ways to implement convolutions efficiently Fast Fourier Transform to compute the convolution (cudnn_v3) Computing the convolutions directly (cuda-convnet)
16 IMPLEMENTATION ON GPU USING CUDNN
17 INTRODUCTION TO CUDNN cudnn is a GPU-accelerated library of primitives for deep neural networks Convolution forward and backward Pooling forward and backward Softmax forward and backward Neuron activations forward and backward: Rectified linear (ReLU) Sigmoid Hyperbolic tangent (TANH) Tensor transformation functions
18 INTRODUCTION TO CUDNN (VERSION 2) cudnn's convolution routines aim for performance competitive with the fastest GEMM Lowering the convolutions into a matrix multiplication (Sharan Chetlur et. al., 2015)
19 INTRODUCTION TO CUDNN Benchmarks
20 LEARNING VGG MODEL USING CUDNN Data Layer Convolution Layer Pooling Layer Fully Connected Layer Softmax Layer
21 COMMON DATA STRUCTURE FOR LAYER Device memory & tensor description for input/output data & error Tensor Description defines dimensions of data float cudnntensordescriptor_t cudnntensordescriptor_t *d_input, *d_output, *d_inputdelta, *d_outputdelta inputdesc; outputdesc;
22 DATA LAYER
23 CONVOLUTION LAYER Initailization
24 CONVOLUTION LAYER
25 CONVOLUTION LAYER
26 CONVOLUTION LAYER
27 CONVOLUTION LAYER
28 CONVOLUTION LAYER
29 CONVOLUTION LAYER
30 CONVOLUTION LAYER
31 CONVOLUTION LAYER
32 CONVOLUTION LAYER
33 CONVOLUTION LAYER
34 CONVOLUTION LAYER
35 POOLING LAYER / SOFTMAX LAYER
36 OPTIMIZATION ISSUES
37 OPTIMIZATION
38 OPTIMIZATION
39 OPTIMIZATION
40 OPTIMIZATION
41 SPEED
42 SPEED
43 PARALLELISM
44 PARALLELISM
45 PARALLELISM
46 INTRODUCING VUNO-NET
47 THE TEAM
48 VUNO-NET
49 VUNO-NET
50 PERFORMANCE
51 APPLICATION
52 APPLICATION
53 APPLICATION
54 VISUALIZATION
55 VISUALIZATION
56 VISUALIZATION
57
58 THANK YOU
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