# Trainable Weka Segmentation - How to install new classifiers

### Introduction

From version 3.7.2, Weka has a package manager (understanding package not in the java sense but as a bundle of additional functionality, separate from that supplied in the main weka.jar file). Many learning algorithms and tools that were present in earlier versions of Weka have become separate packages from version 3.7.2 and need to be installed via the package manager.

In this tutorial we describe step by step how to add new classifiers to the Trainable Weka Segmentation plugin using the Weka package manager.

### Calling the package manager

We assume you are familiar with the Trainable Weka Segmentation plugin and know why and how to use it, otherwise, please go back to a more basic tutorial.

To get started, from the main plugin GUI click on the Weka button (on the bottom left corner of the window):

This will launch the Weka GUI Chooser and, if it is the first time, a warning dialog will be displayed to warn you about the package manager:

We can just click OK, go the Weka GUI Chooser window and look for the package manager under the menu Tools › Package manager , or by pressing Ctrl\|U :

This will open the Weka Package Manager window: