Book Image

Natural Language Processing with Java Cookbook

By : Richard M. Reese
Book Image

Natural Language Processing with Java Cookbook

By: Richard M. Reese

Overview of this book

Natural Language Processing (NLP) has become one of the prime technologies for processing very large amounts of unstructured data from disparate information sources. This book includes a wide set of recipes and quick methods that solve challenges in text syntax, semantics, and speech tasks. At the beginning of the book, you'll learn important NLP techniques, such as identifying parts of speech, tagging words, and analyzing word semantics. You will learn how to perform lexical analysis and use machine learning techniques to speed up NLP operations. With independent recipes, you will explore techniques for customizing your existing NLP engines/models using Java libraries such as OpenNLP and the Stanford NLP library. You will also learn how to use NLP processing features from cloud-based sources, including Google and Amazon Web Services (AWS). You will master core tasks, such as stemming, lemmatization, part-of-speech tagging, and named entity recognition. You will also learn about sentiment analysis, semantic text similarity, language identification, machine translation, and text summarization. By the end of this book, you will be ready to become a professional NLP expert using a problem-solution approach to analyze any sort of text, sentence, or semantic word.
Table of Contents (14 chapters)

Training a specialized POS model

We will use the OpenNLP API to demonstrate how to train a specialized POS model. Training your own model is important when the pre-trained models do not work satisfactorily for the problem at hand and there are no other specialized models available for the language or problem domain.

We will use the POSTaggerME class to train our model. We will need to create a file that contains POS markups. Once trained, we will test the model using the technique demonstrated in the Finding POS using tagging recipe.

Getting ready

To prepare, we need to do the following:

  1. Create a new Maven project.
  2. Add the following dependency to the project's POM file:
<dependency>
<groupId>org.apache...