Book Image

Hands-On Unsupervised Learning with Python

By : Giuseppe Bonaccorso
Book Image

Hands-On Unsupervised Learning with Python

By: Giuseppe Bonaccorso

Overview of this book

Unsupervised learning is about making use of raw, untagged data and applying learning algorithms to it to help a machine predict its outcome. With this book, you will explore the concept of unsupervised learning to cluster large sets of data and analyze them repeatedly until the desired outcome is found using Python. This book starts with the key differences between supervised, unsupervised, and semi-supervised learning. You will be introduced to the best-used libraries and frameworks from the Python ecosystem and address unsupervised learning in both the machine learning and deep learning domains. You will explore various algorithms, techniques that are used to implement unsupervised learning in real-world use cases. You will learn a variety of unsupervised learning approaches, including randomized optimization, clustering, feature selection and transformation, and information theory. You will get hands-on experience with how neural networks can be employed in unsupervised scenarios. You will also explore the steps involved in building and training a GAN in order to process images. By the end of this book, you will have learned the art of unsupervised learning for different real-world challenges.
Table of Contents (12 chapters)

Questions

  1. In a GAN, the generator and discriminator play the same roles as the encoder and decoder in an autoencoder. Is this correct?
  2. Can a discriminator output values in the range (-1, 1)?
  3. One of the problems with GANs is the premature convergence of the discriminator. It this correct?
  4. In a Wasserstein GAN, is the critic (the discriminator) slower than the generator during the training phase?
  5. Considering the previous question, what is the reason for the different speeds?
  6. What is the value of the Jensen-Shannon divergence between U(-1, 0) and U(1, 2)?
  7. What is the goal of the winner-takes-all strategy?
  8. What's the purpose of the adjustment phase of the SOM training process?