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

Reframing your dataframe

Data collected from various sources is often termed raw data. It is called raw in the sense that there might be a lot of unnecessary or stale data, which might not necessarily benefit our model training. The structure of the data collected also might not be consistent among all the sources. Hence, it becomes very important to first reframe the data from various sources into a consistent format.

You may have noticed that once we import the dataset into H2O, H2O converts the dataset into a .hex file, also called a dataframe. You have the option to import multiple datasets as well. Assuming you are importing multiple datasets from various sources, each with its own format and structure, then you will need a certain functionality that helps you reframe the contents of the dataset and merge them to form a single dataframe that you can feed to your ML pipeline.

H2O provides several functionalities that you can use to perform the required manipulations.

Here...