coursera-gan-specialization | Programming assignments and quizzes from all courses | Machine Learning library
kandi X-RAY | coursera-gan-specialization Summary
kandi X-RAY | coursera-gan-specialization Summary
Generative Adversarial Networks (GANs) are powerful machine learning models capable of generating realistic image, video, and voice outputs. Rooted in game theory, GANs have wide-spread application: from improving cybersecurity by fighting against adversarial attacks and anonymizing data to preserve privacy to generating state-of-the-art images, colorizing black and white images, increasing image resolution, creating avatars, turning 2D images to 3D, and more. As computing power has increased, so has the popularity of GANs and its capabilities. GANs have opened up many new directions: from generating high amounts of datasets for training machine learning models and allowing for powerful unsupervised learning models to producing sharper, discrete, and more accurate outputs. GANs have also informed research in adjacent areas like adversarial learning, adversarial examples and attacks, model robustness, etc.
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QUESTION
I am following this Github Repo for the WGAN implementation with Gradient Penalty.
And I am trying to understand the following method, which does the job of unit-testing the gradient-penalty calulations.
...ANSWER
Answered 2022-Apr-02 at 17:11good_gradient = torch.ones(*image_shape) / torch.sqrt(image_size)
First, note the Gradient Penalty term in WGAN is =>
(norm(gradient(interpolated)) - 1)^2
And for the Ideal Gradient (i.e. a Good Gradient), this Penalty term would be 0. i.e. A Good gradient is one which has its gradient_penalty is as close to 0 as possible
This means the following should satisfy, after considering the L2-Norm of the Gradient
(norm(gradient(x')) -1)^2 = 0
i.e norm(gradient(x')) = 1
i.e. sqrt(Sum(gradient_i^2) ) = 1
Now if you just continue simplifying the above (considering how norm
is calculated, see my note below) math expression, you will end up with
good_gradient = torch.ones(*image_shape) / torch.sqrt(image_size)
Since you are passing the image_shape
as (256, 1, 28, 28) - so torch.sqrt(image_size)
in your case is tensor(28.)
Effectively the above line is dividing each element of A 4-D Tensor like [[[[1., 1. ... ]]]] with a scaler tensor(28.)
Separately, note hownorm
is calculated
torch.norm
without extra arguments performs, what is called a Frobenius norm which is effectively reshaping the matrix into one long vector and returning the 2-norm of that.
Given an M * N matrix, The Frobenius Norm of a matrix is defined as the square root of the sum of the squares of the elements of the matrix.
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Install coursera-gan-specialization
Learn about GANs and their applications, understand the intuition behind the basic components of GANs, and build your very own GAN using PyTorch.
Assignment: Your First GAN
Build a more sophisticated GAN using convolutional layers. Learn about useful activation functions, batch normalization, and transposed convolutions to tune your GAN architecture and apply them to build an advanced DCGAN specifically for processing images.
Assignment: Deep Convolutional GAN (DCGAN)
Reduce instances of GANs failure due to imbalances between the generator and discriminator by learning advanced techniques such as WGANs to mitigate unstable training and mode collapse with a W-Loss and an understanding of Lipschitz Continuity.
Assignment: Wasserstein GAN with Gradient Penalty (WGAN-GP)
Understand how to effectively control your GAN, modify the features in a generated image, and build conditional GANs capable of generating examples from determined categories.
Assignments: Build a Conditional GAN Controllable Generation
This is the second course of the Generative Adversarial Networks (GANs) Specialization.
Understand the challenges of evaluating GANs, learn about the advantages and disadvantages of different GAN performance measures, and implement the Fréchet Inception Distance (FID) method using embeddings to assess the accuracy of GANs.
Assignment: Evaluating GANs / Fréchet Inception Distance
Find out the disadvantages of GANs when compared to other generative models, discover the pros/cons of these models — plus, learn about the many places where bias in machine learning can come from, why it’s important, and an approach to identify it in GANs.
Quiz: Analyzing Bias
Assignment: Bias
Lab: Variational Autoencoder (VAE)
Understand how StyleGAN improves upon previous models and implement the components and the techniques associated with StyleGAN, currently the most state-of-the-art GAN with powerful capabilities
Assignment: Components of StyleGAN
Optional Notebooks: Components of BigGAN StyleGAN2
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