K-means and decision tree using Weka and JavaFX

Weka is one of the most known tools for Machine Learning in Java, which also has a great Java API including API for k-means clustering. Using JavaFX it is possible to visualize unclassified data, classify the data using Weka APIs and then visualize the result in a JavaFX chart, like the Scatter chart.

In this post we will show a simple application that allows you to load data, show it without series distinction using a JavaFX scatter chart,, then we use Weka to classify the data in a defined number of clusters and finally separated the clustered data by chart series. We will be using the Iris.2D.arff file that comes with Weka download.

K-means clustering using Weka is really simple and requires only a few lines of code as you can see in this post. In our application we will build 3 charts for the Iris dataset:

Data without class distinction (no classes)
The data with the ground truth classification
Data clustered using weka

As you can see the clustered data is really close to the real one (the data with correct labels). The code to build the clustered data:

After creating these 3 charts I also modified the whole code to add a decision tree classifier using weka J48 algorithm implementation. Right after the chart you can see the tree that I built our of the Iris 2d data:

When you click in any chart you will see a new item is added and it will be classified on center chart using the decision tree and on clustered chart using the k-means classification.

We use our generated decision tree to classify data and also the cluster. In the image above as you can see the cluster classify some data differently from what is classified with the decision tree.

I think it is particularly interesting how it is easy to visualize data with JavaFX. The full code for this project can be found on my github, but here is the main class code:

Comentários

Postagens mais visitadas deste blog

Dancing lights with Arduino - The idea

I have been having fun with Arduino these days! In this article I am going to show how did I use an electret mic with Arduino to create a Dancing Lights circuit. Dancing Lights I used to be an eletronician before starting the IT college. I had my own electronics maintenance office to fix television, radios, etc. In my free time I used to create electronic projects to sell and I made a few "reais" selling a version of Dancing lights, but it was too limited: it simply animated lamps using a relay in the output of a 4017 CMOS IC. The circuit was a decimal counter controlled by a 555. 4017 decimal counter. Source in the image When I met Arduino a few years ago, I was skeptical because I said: I can do this with IC, why should I use a microcontroller. I thought that Arduino was for kids. But now my pride is gone and I am having a lot of fun with Arduino :-) The implementation of Dancing Lights with Arduino uses an electret mic to capture the sound and light leds...

Simplest JavaFX ComboBox autocomplete

Based on this Brazilian community post , I've created a sample Combobox auto complete. What it basically does is: When user type with the combobox selected, it will work on a temporary string to store the typed text; Each key typed leads to the combobox to be showed and updated If backspace is type, we update the filter Each key typed shows the combo box items, when the combobox is hidden, the filter is cleaned and the tooltip is hidden: The class code and a sample application is below. I also added the source to my personal github , sent me PR to improve it and there are a lot of things to improve, like space and accents support.

Creating custom Work Item Handler in BPM Suite/jBPM 6

Hi all! In this post I am going to share my experience creating a work item handler for BPM Suite 6.0.3 (which is very similar to jbpm as explained in a previous post ). The Hello World Work Item Handler Let's create a really simple WorkItemHandler just to print "Hello World" in the console. Of course you can implement more feature and make it receive parameters, access database, web services, etc. But in this post we will keep it simple. Really simple. First thing to do is to create a maven project for my WorkItemHandler. Here's the pom.xml of my Maven project: Notice that we are importing jbpm dependency so we can find the java interface that is used to create work item handlers. Now we can start coding. Let's create a class name HelloWorkItemHandler in package org.jugvale.jbpm, here is the simple code: Now we can build our project and go to BPM Suite to configure it so we can use this workitem. Registering the WorkItemHandler UPDATE...

FXApps

Pesquisar este blog