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

Manipulating feature columns of the dataframe

The majority of the time, your data processing activities will mostly involve manipulating the columns of the dataframes. Most importantly, the type of values in the column and the ordering of the values in the column will play a major role in model training.

H2O provides some functionalities that help you do so. The following are some of the functionalities that help you handle missing values in your dataframe:

  • Sorting of columns
  • Changing the type of the column

Let’s first understand how we can sort a column using H2O.

Sorting columns

Ideally, you want the data in a dataframe to be shuffled before passing it off to model training. However, there may be certain scenarios where you might want to re-order the dataframe based on the values in a column.

H2O has a functionality called sort() to sort dataframes based on the values in a column. It has the following parameters:

  • by: The column to sort...