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

Experimenting with parameters that support cross-validation

When performing model training on a dataset, we usually perform a train-test split on the dataset. Let’s assume we split it in the ratio of 70% and 30%, where 70% is used to create the training dataset and the remaining 30% is used to create the test dataset. Then, we pass the training dataset to the ML system for training and use the test dataset to calculate the performance of the model. A train-test split is often performed in a random state, meaning 70% of the data that was used to create the training dataset is often chosen at random from the original dataset without replacement, except in the case of time-series data, where the order of the events needs to be maintained or in the case where we need to keep the classes stratified. Similarly, for the test dataset, 30% of the data is chosen at random from the original dataset to create the test dataset.

The following diagram shows how data from the dataset is...