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20190611 Study Neural Network
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20190611 Study Neural Network
1.
AI 2019/06/11 version
2.
AI/ 2006 DL:Deep Learning(
) Internet/Cloud GPU 2012 AlexNet 2016 AlphaGo
3.
LSVRC(Large Scale Visual
Recognition Challenge) ImageNet(http://www.image-net.org/) 1000 CNN AlexNet VGGNet ResNet GoogLeNet
4.
https://signate.jp/competitions/138
5.
Pix2Pix https://affinelayer.com/pixsrv/
6.
RNN Seq2Seq(Sequence to Sequence) Encoder
Decoder My name is Yamada
7.
End-to-End / / ( )
8.
TensorFlow playground https://playground.tensorflow.org/
9.
1
10.
1 Run!!!
11.
12.
(Node)
13.
14.
y1 = w11x1
+ w21x2 + w31x3 x1 x2 x3 w11 w21 w31 y1
15.
y1 = w11x1
+ w21x2 + w31x3 x1 x2 x3 w11 w21 w31 y1 W
16.
x1 x2 x3 w11 w21 w31 y1 W y1 = w11x1
+ w21x2 + w31x3
17.
x1 x2 x3 w11 w21 w31 y1 W y1 = w11x1
+ w21x2 + w31x3
18.
x1 x2 x3 y1 = w11x1
+ w21x2 + w31x3 y1
19.
x1 x2 x3 y2 = w12x1
+ w22x2 + w32x3 y1 y2
20.
x1 x2 x3 y3 = w13x1
+ w23x2 + w33x3 y1 y2 y3
21.
x1 x2 x3 y4 = w14x1
+ w24x2 + w34x3 y1 y2 y3 y4
22.
x1 x2 x3 z1 = w11y1
+ w21y2 + w31y3 + w41y4 y1 y2 y3 y4 z1
23.
x1 x2 x3 z2 = w12y1
+ w22y2 + w32y3 + w42y4 y1 y2 y3 y4 z1 z2
24.
x1 x2 x3 z2 = w12y1
+ w22y2 + w32y3 + w42y4 y1 y2 y3 y4 z1 z2 SoftMax
25.
(Node) ( )
Deep Neural Network(DNN) →Deep Learning( ) (Weight)
26.
27.
or ( )
28.
DATA
29.
( )
30.
:(Layer )
31.
:(Layer ) :( )
32.
( )
33.
Click
34.
35.
36.
Activation
37.
y1 = w11x1
+ w21x2 + w31x3 x1 x2 x3 w11 w21 w31 y1
38.
y1 = f(w11x1
+ w21x2 + w31x3) x1 x2 x3 w11 w21 w31 u f(u)
39.
Linear( )
40.
ReLU https://dashee87.github.io/deep%20learning/visualising-activation-functions-in-neural-networks/
41.
Tanh https://dashee87.github.io/deep%20learning/visualising-activation-functions-in-neural-networks/
42.
Sigmoid https://dashee87.github.io/deep%20learning/visualising-activation-functions-in-neural-networks/
43.
(Forward) → (Weight ) ✔
(Backward) ✔ (Epoch, mini Batch) ✔ (Learning Rate)
44.
(Label)
45.
(Forward)
46.
(Forward)
47.
(Forward)
48.
(Forward)
49.
50.
(loss)
51.
(loss) (Backward)
52.
(loss) (Backward)
53.
(loss) (Backward)
54.
( ) 3
train, (eval), test (over fitting)
55.
Iteration weight (Forward/Backward:1 ) (mini)Batch
size 1iteration Epoch 1Epoch =
56.
MNIST( ) 60,000 10,000 5Epoch, Batch
size=32 60000/32 = 1,875 iteration 5
57.
MNIST( ) 60,000 10,000 5Epoch, Batch
size=32 60000/32 = 1,875 iteration 5
58.
(Learning Rate) weight =
= Epoch
59.
(train vs test)
60.
Epoch Batch size
61.
Loss
62.
Learning rate
63.
Training( Show test data
test ) batch size=10, 30 training loss=0.001 Epoch Learning rate=1 Training Learning rate=0.001 Training
64.
1 weight TensorFlow Playground
65.
2 Optimizer, Weight Decay
66.
/ df(x) dx = lim h→0 f(x +
h) − f(x) h df(x) dx = lim h→0 f(x + h) − f(x − h) 2h
67.
f(x0, x1) =
x2 0 + x2 1 ( ∂f ∂x0 , ∂f ∂x1 )
68.
(gradient) f(x0, x1) =
x2 0 + x2 1 f(x0, x1) = sin(x0) + cos(x1)
69.
70.
71.
72.
< >
73.
< >
74.
x0 = x0
− ∂f ∂x0 x0 = x0−η ∂f ∂x0 η: (Learning Rate)
75.
η = 0.01f(x0,
x1) = x2 0 + x2 1
76.
η = 1.1f(x0,
x1) = x2 0 + x2 1
77.
η = 0.001f(x0,
x1) = x2 0 + x2 1
78.
Optimizer Y = WX W
= w11 w12 w13 w14 w21 w22 w23 w24 w31 w32 w33 w34 x1 x2 x3 y1 y2 y3 y4
79.
SGD Stochastic Gradient Descent W
← W − η ∂L ∂W
80.
SGD Stochastic Gradient Descent W
← W − η ∂L ∂W
81.
Momentum v ← av
− η ∂L ∂W W ← W + v
82.
AdaGrad h ← h
+ ∂L ∂W ⊙ ∂L ∂W W ← W − η 1 h ∂L ∂W
83.
Adam Momentum+AdaGrad mt ← β1mt−1
+ (1 − β1)gt θt+1 ← θt − α ̂mt ̂vt + ϵ vt ← β2vt−1 + (1 − β2)g2 t ̂mt ← mt 1 − βt 1 ̂vt ← vt 1 − βt 2 β1 = 0.9,β2 = 0.999,ϵ = 10−8 gt = ∂L ∂W θt = W α = η αt = α (1 − βt 2) (1 − βt 1) θt+1 ← θt − αt mt vt + ̂ϵ
84.
Adam Momentum+AdaGrad mt ← β1mt−1
+ (1 − β1) ∂L ∂W vt ← β2vt−1 + (1 − β2)( ∂L ∂W ⊙ ∂L ∂W ) ηt = η (1 − βt 2) (1 − βt 1) W ← W − ηt mt vt + ̂ϵ
85.
86.
Optimizer - RMSprop, Adadelta,
AMSGrad - Adabound, AMSbound
87.
Adam Adam, SGD Adabound η* ∞ t η SGD Adam: (0)→ ※ Adabound: / SGD
88.
Adabound ←β α( )
89.
Adabound
90.
Weight Decay (overfitting) (Weight)
SGD W ← W − η ∂L ∂W − ηλW λ :Weight Decay
91.
Loss L2 W ←
W − η ∂L ∂W − ηλW ̂L(W) = L(W) + λ 2 ∥W∥2 L2 (Ridge): L1 (LASSO): w2 1 + w2 2 + ⋯ + w2 n |w1 | + |w2 | + ⋯ + |wn |
92.
Tips:Adam ? Adam Optimizer Weight
Decay !? Decoupled Weight Decay Regularization https://arxiv.org/abs/1711.05101
93.
( ) Y =
(WX + b)2 s = z + b Y = s2 z = WX
94.
( ) ✖ ^2X
Y W b s = z + b Y = s2z = WX z s
95.
( ) ✖ ^2X
Y W b s = z + b Y = s2z = WX z s ∂L ∂Y
96.
( ) ✖ ^2X
Y W b s = z + b Y = s2z = WX z s ∂L ∂Y ∂Y ∂s = 2s 2s ∂L ∂Y
97.
( ) ✖ ^2X
Y W b s = z + b Y = s2z = WX z s ∂L ∂Y 2s ∂L ∂Y 2s ∂L ∂Y 2s ∂L ∂Y
98.
( ) ✖ ^2X
Y W b s = z + b Y = s2z = WX z s ∂L ∂Y 2s ∂L ∂Y 2s ∂L ∂Y 2s ∂L ∂Y ∂z ∂X 2s ∂L ∂Y
99.
( ) ✖ ^2X
Y W b s = z + b Y = s2z = WX z s ∂L ∂Y 2s ∂L ∂Y 2s ∂L ∂Y 2s ∂L ∂Y ∂z ∂X 2s ∂L ∂Y ∂z ∂W 2s ∂L ∂Y
100.
(/ ) ✖ ^2X
Y W b z s ∂L ∂Y 2s ∂L ∂Y 2s ∂L ∂Y 2s ∂L ∂Y ∂z ∂X 2s ∂L ∂Y ∂z ∂W 2s ∂L ∂Y ( ) ZERO
101.
2 SGD Optimizer 3 CNN
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