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| <!--- Licensed to the Apache Software Foundation (ASF) under one --> |
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| |
| <h1 id="run-mxnet-java-examples-using-the-intellij-ide-macos">Run MXNet Java Examples Using the IntelliJ IDE (macOS)</h1> |
| |
| <p>This tutorial guides you through setting up a simple Java project in IntelliJ IDE on macOS and demonstrates usage of the MXNet Java APIs.</p> |
| |
| <h2 id="prerequisites">Prerequisites:</h2> |
| |
| <p>To use this tutorial you need the following pre-requisites:</p> |
| |
| <ul> |
| <li><a href="http://www.oracle.com/technetwork/java/javase/downloads/index.html">Java 8 JDK</a></li> |
| <li><a href="https://maven.apache.org/install.html">Maven</a></li> |
| <li><a href="https://opencv.org/">OpenCV</a></li> |
| <li><a href="https://www.jetbrains.com/idea/">IntelliJ IDEA</a> (One can download the community edition from <a href="https://www.jetbrains.com/idea/download">here</a>)</li> |
| </ul> |
| |
| <h3 id="macos-prerequisites">MacOS Prerequisites</h3> |
| |
| <p>Run the following commands to install the prerequisites on MacOS. |
| <code> |
| /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" |
| brew update |
| brew tap caskroom/versions |
| brew cask install java8 |
| brew install maven |
| brew install opencv |
| </code></p> |
| |
| <h3 id="ubuntu-prerequisites">Ubuntu Prerequisites</h3> |
| |
| <p>Run the following commands to install the prerequisites on Ubuntu.</p> |
| <div class="highlight"><pre><code class="language-" data-lang="">sudo apt-get install openjdk-8-jdk maven |
| </code></pre></div> |
| <h2 id="set-up-your-project">Set Up Your Project</h2> |
| |
| <p><strong>Step 1.</strong> Install and setup <a href="https://www.jetbrains.com/idea/">IntelliJ IDEA</a></p> |
| |
| <p><strong>Step 2.</strong> Create a new Project:</p> |
| |
| <p><img src="https://raw.githubusercontent.com/dmlc/web-data/master/mxnet/scala/intellij-welcome.png" alt="intellij welcome"></p> |
| |
| <p>From the IntelliJ welcome screen, select "Create New Project".</p> |
| |
| <p>Choose the Maven project type.</p> |
| |
| <p>Select the checkbox for <code>Create from archetype</code>, then choose <code>org.apache.maven.archetypes:maven-archetype-quickstart</code> from the list below. More on this can be found on a Maven tutorial : <a href="https://maven.apache.org/guides/getting-started/maven-in-five-minutes.html">Maven in 5 Minutes</a>.</p> |
| |
| <p><img src="https://raw.githubusercontent.com/dmlc/web-data/master/mxnet/tutorials/java/project-archetype.png" alt="maven project type - archetype"></p> |
| |
| <p>click <code>Next</code>.</p> |
| |
| <p><img src="https://raw.githubusercontent.com/dmlc/web-data/master/mxnet/tutorials/java/intellij-project-metadata.png" alt="project metadata"></p> |
| |
| <p>Set the project's metadata. For this tutorial, use the following:</p> |
| |
| <p><strong>GroupId</strong> |
| <code> |
| mxnet |
| </code> |
| <strong>ArtifactId</strong> |
| <code> |
| javaMXNet |
| </code> |
| <strong>Version</strong> |
| <code> |
| 1.0-SNAPSHOT |
| </code></p> |
| |
| <p><img src="https://raw.githubusercontent.com/dmlc/web-data/master/mxnet/tutorials/java/intellij-project-properties.png" alt="project properties"></p> |
| |
| <p>Review the project's properties. The settings can be left as their default.</p> |
| |
| <p><img src="https://raw.githubusercontent.com/dmlc/web-data/master/mxnet/tutorials/java/intellij-project-location.png" alt="project location"></p> |
| |
| <p>Set the project's location. The rest of the settings can be left as their default.</p> |
| |
| <p><img src="https://raw.githubusercontent.com/dmlc/web-data/master/mxnet/tutorials/java/intellij-project-pom.png" alt="project 1"></p> |
| |
| <p>After clicking Finish, you will be presented with the project's first view. |
| The project's <code>pom.xml</code> will be open for editing.</p> |
| |
| <p><strong>Step 3.</strong> The Java packages are currently available on Maven. Add the following under the <code>dependencies</code> tag :</p> |
| <div class="highlight"><pre><code class="language-html" data-lang="html"><span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.apache.mxnet<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>mxnet-full_2.11-osx-x86_64-cpu<span class="nt"></artifactId></span> |
| <span class="nt"><version></span>1.4.0<span class="nt"></version></span> |
| <span class="nt"></dependency></span> |
| </code></pre></div> |
| <p>The official Java Packages have been released as part of MXNet 1.4 and are available on the <a href="https://search.maven.org/#search%7Cga%7C1%7Cg%3A%22org.apache.mxnet%22">MXNet Maven package repository</a>.</p> |
| |
| <p>Note : |
| - Change the osx-x86_64 to linux-x86_64 if your platform is linux. |
| - Change cpu into gpu if you have a gpu backed machine and want to use gpu.</p> |
| |
| <p><strong>Step 4.</strong> Import dependencies with Maven:</p> |
| |
| <ul> |
| <li>Note the prompt in the lower right corner that states "Maven projects need to be imported". If this is not visible, click on the little greed balloon that appears in the lower right corner.</li> |
| </ul> |
| |
| <p><img src="https://raw.githubusercontent.com/dmlc/web-data/master/mxnet/tutorials/java/project-import-changes.png" alt="import_dependencies"></p> |
| |
| <p>Click "Import Changes" in this prompt.</p> |
| |
| <p><strong>Step 5.</strong> Build the project: |
| - To build the project, from the menu choose Build, and then choose Build Project.</p> |
| |
| <p><strong>Step 6.</strong> Navigate to the App.java class in the project and paste the code in <code>main</code> method from HelloWorld.java from <a href="https://github.com/apache/incubator-mxnet/tree/master/scala-package/mxnet-demo/java-demo/src/main/java/mxnet/HelloWorld.java">Java Demo project</a> on MXNet repository, overwriting the original hello world code. |
| You can also grab the entire <a href="https://github.com/apache/incubator-mxnet/tree/master/scala-package/mxnet-demo/java-demo">Java Demo project</a> and run it by following the instructions on the <a href="https://github.com/apache/incubator-mxnet/blob/master/scala-package/mxnet-demo/java-demo/README.md">README</a>.</p> |
| |
| <p><strong>Step 7.</strong> Now run the App.java.</p> |
| |
| <p>The result should be something similar to this:</p> |
| <div class="highlight"><pre><code class="language-" data-lang="">Hello World! |
| (1,2) |
| Process finished with exit code 0 |
| </code></pre></div> |
| <h3 id="troubleshooting">Troubleshooting</h3> |
| |
| <p>If you get an error, check the dependencies at the beginning of this tutorial. For example, you might see the following in the middle of the error messages, where <code>x.x</code> would the version it's looking for.</p> |
| <div class="highlight"><pre><code class="language-" data-lang="">... |
| Library not loaded: /usr/local/opt/opencv/lib/libopencv_calib3d.x.x.dylib |
| ... |
| </code></pre></div> |
| <p>This can be resolved be installing OpenCV.</p> |
| |
| <h3 id="command-line-build-option">Command Line Build Option</h3> |
| |
| <ul> |
| <li>You can also compile the project by using the following command at the command line. Change directories to this project's root folder then run the following:</li> |
| </ul> |
| <div class="highlight"><pre><code class="language-bash" data-lang="bash">mvn clean <span class="nb">install </span>dependency:copy-dependencies |
| </code></pre></div> |
| <p>If the command succeeds, you should see a lot of info and some warning messages, followed by:</p> |
| <div class="highlight"><pre><code class="language-bash" data-lang="bash"><span class="o">[</span>INFO] <span class="nt">------------------------------------------------------------------------</span> |
| <span class="o">[</span>INFO] BUILD SUCCESS |
| <span class="o">[</span>INFO] <span class="nt">------------------------------------------------------------------------</span> |
| <span class="o">[</span>INFO] Total <span class="nb">time</span>: 3.475 s |
| <span class="o">[</span>INFO] Finished at: 2018-11-08T05:06:31-08:00 |
| <span class="o">[</span>INFO] <span class="nt">------------------------------------------------------------------------</span> |
| </code></pre></div> |
| <p>The build generates a new jar file in the <code>target</code> folder called <code>javaMXNet-1.0-SNAPSHOT.jar</code>.</p> |
| |
| <p>To run the App.java use the following command from the project's root folder and you should see the same output as we got when the project was run from IntelliJ. |
| <code>bash |
| java -cp "target/javaMXNet-1.0-SNAPSHOT.jar:target/dependency/*" mxnet.App |
| </code></p> |
| |
| <h2 id="next-steps">Next Steps</h2> |
| |
| <p>For more information about MXNet Java resources, see the following:</p> |
| |
| <ul> |
| <li><a href="/versions/1.6/api/java">Java Inference API</a></li> |
| <li><a href="https://github.com/apache/incubator-mxnet/tree/master/scala-package/examples/src/main/java/org/apache/mxnetexamples/javaapi/infer">Java Inference Examples</a></li> |
| <li><a href="/versions/1.6/api">MXNet Tutorials Index</a></li> |
| </ul> |
| |
| </div> |
| </div> |
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