Book Image

Practical Automated Machine Learning Using H2O.ai

By : Salil Ajgaonkar
Book Image

Practical Automated Machine Learning Using H2O.ai

By: Salil Ajgaonkar

Overview of this book

With the huge amount of data being generated over the internet and the benefits that Machine Learning (ML) predictions bring to businesses, ML implementation has become a low-hanging fruit that everyone is striving for. The complex mathematics behind it, however, can be discouraging for a lot of users. This is where H2O comes in – it automates various repetitive steps, and this encapsulation helps developers focus on results rather than handling complexities. You’ll begin by understanding how H2O’s AutoML simplifies the implementation of ML by providing a simple, easy-to-use interface to train and use ML models. Next, you’ll see how AutoML automates the entire process of training multiple models, optimizing their hyperparameters, as well as explaining their performance. As you advance, you’ll find out how to leverage a Plain Old Java Object (POJO) and Model Object, Optimized (MOJO) to deploy your models to production. Throughout this book, you’ll take a hands-on approach to implementation using H2O that’ll enable you to set up your ML systems in no time. By the end of this H2O book, you’ll be able to train and use your ML models using H2O AutoML, right from experimentation all the way to production without a single need to understand complex statistics or data science.
Table of Contents (19 chapters)
1
Part 1 H2O AutoML Basics
4
Part 2 H2O AutoML Deep Dive
10
Part 3 H2O AutoML Advanced Implementation and Productization

Understanding the Distributed Random Forest algorithm

DRF, simply called Random Forest, is a very powerful supervised learning technique often used for classification and regression. The foundation of the DRF learning technique is based on decision trees, where a large number of decision trees are randomly created and used for predictions and their results are combined to get the final output. This randomness is used to minimize the bias and variance of all the individual decision trees. All the decision trees are collectively combined and called a forest, hence the name Random Forest.

To get a deeper conceptual understanding of DRF, we need to understand the basic building block of DRF – that is, a decision tree.

Introduction to decision trees

In very simple terms, a decision tree is just a set of IF conditions that either return a yes or a no answer based on data passed to it. The following diagram shows a simple example of a decision tree:

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