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

Working with prediction functions in H2O Flow

Now that you finally have a trained model, we can perform predictions on it. Predictions on trained models are straightforward. You just need to load the model and pass in your dataset, which contains the data on which you want to make predictions. H2O will use the loaded model and make predictions for all the values in the dataset. Let’s use the prediction_dataframe.hex dataframe that we created previously to make predictions on.

We will gain an understanding of the prediction operations in the following sub-sections, starting with gaining an understanding of how to make predictions.

Making predictions using H2O Flow

First, let’s start by exploring the Score operation’s drop-down list in the topmost part of the web UI.

You will see a list of scoring operations, as follows:

Figure 2.40 – The Score functions drop-down menu

The preceding drop-down menu shows you a list of all...