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

Tokenization of textual data

Not all Machine Learning Algorithms (MLAs) are focused on mathematical problem-solving. Natural Language Processing (NLP) is a branch of ML that specializes in analyzing meaning out of textual data, though it will try to derive meaning and understand the contents of a document or any text for that matter. Training an NLP model can be very tricky, as every language has its own grammatical rules and the interpretation of certain words depends heavily on context. Nevertheless, an NLP algorithm often tries its best to train a model that can predict the meaning and sentiments of a textual document.

The way to train an NLP algorithm is to first break down the chunk of textual data into smaller units called tokens. Tokens can be words, characters, or even letters. It depends on what the requirements of the MLA are and how it uses these tokens to train a model.

H2O has a function called tokenize() that helps break down string data in a dataframe into tokens...