Natural Language Processing with Java

Using APIs to classify text

We will use OpenNLP, Stanford API, and LingPipe to demonstrate various classification approaches. We will spend more time with LingPipe as it offers several different classification approaches.

Using OpenNLP

The DocumentCategorizer interface specifies methods to support the classification process. The interface is implemented by the DocumentCategorizerME class. This class will classify text into predefined categories using a maximum entropy framework. We will:

• Demonstrate how to train the model
• Illustrate how the model can be used

Training an OpenNLP classification model

First, we have to train our model because OpenNLP does not have prebuilt models. This process consists of creating a file of training data and then using ...