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)

Online clustering

Sometimes a dataset is too large to fit in memory, or the samples are streamed through a channel and received at different time steps. In this cases, none of the algorithms previously discussed can be employed because they assume to access to the whole dataset since the first steps. For this reasons, some online alternatives have been proposed and they are currently implemented in many real-life processes.

Mini-batch K-means

This algorithm is an extension of standard K-means but, as centroids cannot be computed with all samples, it's necessary to include an additional step that is responsible for reassigning the samples when an existing cluster is no longer valid. In particular, instead of computing...