practice: vae and gan - deep generative models
Post on 14-May-2022
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Practice: VAE and GANHao Dong
Peking University
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Practice: VAE + GAN
• Hello World: MNIST Classification
• Introduction of VAE• VAE Architecture• VAE Training• VAE Interpolation• Sampling
• Introduction of DCGAN• DCGAN Architecture• DCGAN Training• DCGAN Interpolation
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• Hello World: MNIST Classification
• Introduction of VAE• VAE Architecture• VAE Training• VAE Interpolation• Sampling
• Introduction of DCGAN• DCGAN Architecture• DCGAN Training• DCGAN Interpolation
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Hello World: MNIST Classification
28x28x1 = 784 binary values/image
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MNIST dataset
• Image X is a list of row vectors:>>> X_train, y_train, X_val, y_val, X_test, y_test = tl.files.load_mnist_dataset(shape=(-1, 784))>>> print(X_train.shape)… (50000, 784)
• Image X is a list of images:>>> X_train, y_train, X_val, y_val, X_test, y_test = tl.files.load_mnist_dataset(shape=(-1, 28, 28, 1))>>> print(X_train.shape)… (50000, 28, 28, 1)
If RGB image, we will have 3 channels
(height, width, channels)
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Hello World: MNIST Classification
• Simple Iteration
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Hello World: MNIST Classification
• Dataset API
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• Hello World: MNIST Classification
• Introduction of VAE• VAE Architecture• VAE Training• VAE Interpolation• Sampling
• Introduction of DCGAN• DCGAN Architecture• DCGAN Training• DCGAN Interpolation
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Introduction of VAE
!𝑿!𝒁X
L2
KLD
• Two network architectures
• Two loss functions
• Reparameterization trick
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• Hello World: MNIST Classification
• Introduction of VAE• VAE Architecture• VAE Training• VAE Interpolation• Sampling
• Introduction of DCGAN• DCGAN Architecture• DCGAN Training• DCGAN Interpolation
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VAE Architecture
!𝑿!𝒁X
L2
KLD
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28x28x1 or 784
𝑥~𝑝𝑑𝑎𝑡𝑎
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VAE Architecture
!𝑿!𝒁X
L2
KLD
• Architecture of Encoder
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VAE Architecture
!𝑿!𝒁X
L2
KLD
• Architecture of Decoder/Generator
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• Hello World: MNIST Classification
• Introduction of VAE• VAE Architecture• VAE Training• VAE Interpolation• Sampling
• Introduction of DCGAN• DCGAN Architecture• DCGAN Training• DCGAN Interpolation
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VAE Training
!𝑿!𝒁X
L2
KLD
Reconstruction Loss
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VAE Training
!𝑿!𝒁X
L2
KLD
KL-Divergence loss
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VAE Training
!𝑿!𝒁X
L2
KLD
Training Pipeline
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• Hello World: MNIST Classification
• Introduction of VAE• VAE Architecture• VAE Training• VAE Interpolation• Sampling
• Introduction of DCGAN• DCGAN Architecture• DCGAN Training• DCGAN Interpolation
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VAE Interpolation
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• Hello World: MNIST Classification
• Introduction of VAE• VAE Architecture• VAE Training• VAE Interpolation• Sampling
• Introduction of DCGAN• DCGAN Architecture• DCGAN Training• DCGAN Interpolation
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Sampling
!𝑿Z
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• Hello World: MNIST Classification
• Introduction of VAE• VAE Architecture• VAE Training• VAE Interpolation• Sampling
• Introduction of DCGAN• DCGAN Architecture• DCGAN Training• DCGAN Interpolation
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Introduction of DCGAN
• Two network architectures
• Two loss functions!𝑿
X
real
fakeZ
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• Hello World: MNIST Classification
• Introduction of VAE• VAE Architecture• VAE Training• VAE Interpolation• Sampling
• Introduction of DCGAN• DCGAN Architecture• DCGAN Training• DCGAN Interpolation
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DCGAN Architecture
!𝑿
X
real
fakeZ
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28x28x1 or 784
𝑧~𝑁(0,1)
𝑥~𝑝𝑑𝑎𝑡𝑎
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DCGAN Architecture
!𝑿
X
real
fakeZ
Architecture of generator
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DCGAN Architecture
!𝑿
X
real
fakeZ
Architecture of discriminator
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• Hello World: MNIST Classification
• Introduction of VAE• VAE Architecture• VAE Training• VAE Interpolation• Sampling
• Introduction of DCGAN• DCGAN Architecture• DCGAN Training• DCGAN Interpolation
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DCGAN Training
!𝑿
X
fake
realZ
Loss of discriminator
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DCGAN Training
!𝑿 realZ
Loss of generator
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DCGAN Training
Training pipeline
!𝑿
X
real
fakeZ
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• Hello World: MNIST Classification
• Introduction of VAE• VAE Architecture• VAE Training• VAE Interpolation• Sampling
• Introduction of DCGAN• DCGAN Architecture• DCGAN Training• DCGAN Interpolation
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DCGAN Interpolation
!𝑿
Z1
Z2
(1-a) Z1+a Z2
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More
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Improved GANLSGANWGAN
WGAN-GPBiGAN
VAE-GAN…
with MNIST
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Pix2PixCycleGAN
SRGAN…
with other datasets
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Proposal Your Projects
Thanks
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