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

Summary

In this chapter, we first explored the various techniques and some of the common functions we use to preprocess our dataframe before it is sent to model training. We looked into how we can reframe our raw dataframe into a suitable consistent format that meets the requirement for model training. We learned how to manipulate the columns of dataframes by combining them with different columns of different dataframes. We learned how to combine rows from partitioned dataframes, as well as how to directly merge dataframes into a single dataframe.

Once we knew how to reframe our dataframes, we learned how to handle the missing values that are often present in freshly collected data. We learned how to fill NA values, replace certain incorrect values, as well as how to use different imputation strategies to avoid adding noise and bias when filling missing values.

We then investigated how we can manipulate the feature columns by sorting the dataframes by column, as well as changing...