Skip to content

Visualizing Training with DJL

This module contains UI TrainingListener that provides training visualization UI.

Currently, implemented features:

  • Training/Validating progress
  • Training Metrics Visualization chart


  • You need to have Java Development Kit version 11 or later installed on your system.
  • You should be familiar with the API documentation in the DJL Javadoc.

Install the Java Development Kit

For ubuntu:

sudo apt-get install openjdk-11-jdk-headless

For centos:

sudo yum install java-11-openjdk-devel

For macOS:

brew tap homebrew/cask-versions
brew update
brew cask install adoptopenjdk11

You can also download and install Oracle JDK manually if you have trouble with the previous commands.

If you have multiple versions of Java installed, you can use the $JAVA_HOME environment variable to control which version of Java to use.

How to

Add the Deep Java Library UI dependency to your project.


Add UI Training Listener in a Training Configuration.

   .addTrainingListeners(new UiTrainingListener())

Getting started: 30 seconds to run an example

Build and install DJL UI

This component supports building with Maven. To build, use the following command:

  • Maven build sh mvn clean install -DskipTests -Pfrontend -f djl-ui

Build example project

To build, use the following command:

  • Maven build sh mvn package -DskipTests -f djl-ui-demo

Run example code

Run Handwritten Digit Recognition example

  • Maven sh mvn exec:java -Dexec.mainClass="org.example.MnistTraining" -f djl-ui-demo

Open browser (Please use Safari on macOS)

Open http://localhost:8080 to get: