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

Handling missing values in the dataframe

Missing values in datasets are the most common issue in the real world. It is often expected to have at least a few instances of missing data in huge chunks of datasets collected from various sources. Data can be missing for several reasons, which can range from anything from data not being generated at the source all the way to downtimes in data collectors. Handling missing data is very important for model training, as many ML algorithms don’t support missing data. Those that do may end up giving more importance to looking for patterns in the missing data, rather than the actual data that is present, which distracts the machine from learning.

Missing data is often referred to as Not Available (NA) or nan. Before we can send a dataframe for model training, we need to handle these types of values first. You can either drop the entire row that contains any missing values or you can fill them with any default value either default or common...