Getting started with Clojure and MXNet on AWS

Getting started with Clojure and MXNet on AWS

- 4 mins

Setting up a Deep Learning development box is often a tedious task that requires one to install the proper drivers and toolkits for the given Deep Learning Framework.

This post will cover how to setup such a box for MXNet and Clojure so that any Clojurist can start playing with MXNet on GPUs.


MXNet is the Deep Learning Framework developped jointly by Amazon and Microsoft. It is an incubating Apache Project.

MXNet and Clojure

Long story short: by leveraging Scala, Clojure can talk to the MXNet bindings. And this is amazing! Here is the Clojure Package in the MXNet repository.

AWS Deep Learning AMI

AWS provides AMIs tailored to Deep Learning frameworks. They are pre-configured environments to quickly build deep learning applications. The AMI we will cover in this post is the AWS Deep Learning AMI (base) image - Find it here.

Installation steps

Below are the steps one needs to follow to start playing with MXNet and Clojure on GPUs

  1. Launch an EC2 instance
  2. Connect to the EC2 instance
  3. Update Java to Java 8
  4. Update Cuda version
  5. Install leiningen
  6. Play with Clojure MXNet Examples

Launch an EC2 instance

Launch an EC2 instance with the AWS Deep Learning AMI base image. In this post I assume you select the Deep Learning Base (Amazon Linux) AMI.

AMI Selection

Then pick a GPU instance type. p2.xlarge shoud be enough to get you started and will cost you around $0.90 per hour. Do not forget to terminate it after you are done with your Neural Network training.

Instance Type Selection

Connect to the EC2 instance

Use the pemfile or username/password pair that was created to connect to your EC2 instance

ssh -i "pemfilename.pem"

Update Java to Java 8

From the EC2 instance, run the following command and select java 8 that comes with the AMI

sudo update-alternatives --config java

It may not be necessary to run this if the default java version is already set to java 8.

Update Cuda version

From the EC2 instance, run the following commands to use the proper Cuda version required to run MXNet. For the current MXNet 1.4.0-1.5.0, one needs cuda-9.2

sudo rm /usr/local/cuda
sudo ln -s /usr/local/cuda-9.2 /usr/local/cuda

Install leiningen

Run the following commands to install the latest leiningen

chmod a+x lein
mv lein /usr/bin

Play with Clojure MXNet Examples

First, one needs to clone the MXNet codebase that comes with Clojure examples

git clone

Open project.clj to uncomment the GPU package and comment out the CI package

  ;; Uncomment this line
  [org.apache.mxnet/mxnet-full_2.11-linux-x86_64-gpu "1.5.0-SNAPSHOT"]
  ;; Comment this line used for CI
  ; [org.apache.mxnet/mxnet-full_2.11 "INTERNAL"]

You should now be able to test that the clojure package can run on your EC2 instance

lein test

Install the 1.5.0-SNAPSHOT jar locally

lein install

Navigate the filesystem to get to the Clojure examples

cd incubator-mxnet/contrib/clojure-package/examples

We will run the code from the module example

cd module

One can monitor the GPU processes with the following command

watch nvidia-smi

nvidia-smi output

Now it is time to run some Clojure code and get these Neural Networks to learn something!

Run the code from the REPL

lein repl
mnist-mlp=> (run-all [(context/gpu)])

Or run the code from a leiningen command

lein run :gpu


Congratulations! If you have followed along, you are now able to harness the power of MXNet with Clojure on GPUs! Again, do not forget to terminate your instance once you are done.

Next time, we will cover what MXNet let us do and we will learn how to train Deep Learning models.

References and Resources

Arthur Caillau

Arthur Caillau

A man who eats parentheses for breakfast

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