How I Configured my Ubuntu for deep learning with Python

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When it comes to learning new technology such as deep learning, configuring your development environment tends to be half the battle. Different operating systems, hardware, dependencies, and the actual libraries themselves can lead to many headaches before you’re even able to get started studying deep learning.
These issues are further compounded by the speed of deep learning library updates and releases — new features push innovation, but oftentimes break previous versions. Your environment can quickly become obsolete, so it is imperative to become an expert in installing and configuring your deep learning environment.
I’ll be demonstrating how to configure your own native development environment for the following operating systems and peripherals:
  • Configuring Ubuntu for deep learning with Python (i.e., the post you are currently reading)
  • Setting up Ubuntu (with GPU support) for deep learning with Python
  • Configuring macOS for deep learning with Python

To get started configuring your Ubuntu machine for deep learning with Python, just keep reading.

Configuring Ubuntu for deep learning with Python

Today, our blog post is broken down into four relatively easy steps:
  1. Step #1: Install Ubuntu system dependencies
  2. Step #2: Create your Python 3 virtual environment
  3. Step #3: Compile and Install OpenCV
  4. Step #4: Install Keras
Taking note of the steps, you will see that Deep Learning for Computer Vision with Pythonsupports Python 3.
Notice that we have chosen Keras as our deep learning library. Keras “stands out from the rest” of the available libraries for it’s ease of use and compatibility with both Tensorflow and Theano.
To get started, you’ll want to have some time on your hands and access to an Ubuntu machine’s terminal — SSH is perfectly suitable if your box is in the cloud or elsewhere. Let’s begin!

Step #1: Install Ubuntu system dependencies

The purpose of this step is to prepare your system with the dependencies necessary for OpenCV.
All steps in this tutorial will be accomplished by using your terminal. To start, open up your command line and update the  apt-get  package manager to refresh and upgrade and pre-installed packages/libraries:
We’ll also need to install some developer tools as well as prerequisites required for image and video I/O, optimizations, and creating plots/visualizations:
We’ll wrap up Step #1 by installing the Python development headers and libraries for both Python 2.7 and Python 3.5 (that way you have both).
Note: If you do not install the Python development headers and static library, you’ll run into issues during Step #3 where we run  cmake  to configure our build. If these headers are not installed, then the  cmake  command will be unable to automatically determine the proper values of the Python interpreter and Python libraries. In short, the output of this section will look “empty” and you will not be able to build the Python bindings. When you get to Step #3, take the time to compare your output of the command to mine.
Let’s continue on by creating a virtual environment to house OpenCV and Keras.

Step #2: Create your Python virtual environment

In this section we will setup a Python virtual environment on your system.

Installing pip

We are now ready to start configuring our Python development environment for the build. The first step is to install pip , a Python package manager:

Installing virtualenv and virtualenvwrapper

I’ve mentioned this in every single install tutorial I’ve ever done, but I’ll say it again here today: I’m a huge fan of both virtualenv and virtualenvwrapper. These Python packages allow you to create separate, independent Python environments for eachproject that you are working on.
In short, using these packages allows you to solve the “Project X depends on version 1.x, but Project Y needs 4.x dilemma. A fantastic side effect of using Python virtual environments is that you can keep your system Python neat, tidy, and free from clutter.
While you can certainly install OpenCV with Python bindings without Python virtual environments, I highly recommend you use them as Python virtual environments. I’ll also be assuming that you have both  virtualenv  and  virtualenvwrapper  installed throughout the remainder of this guide.
Again, let me reiterate that it’s standard practice in the Python community to be leveraging virtual environments of some sort, so I suggest you do the same:
Once we have  virtualenv  and  virtualenvwrapper  installed, we need to update our~/.bashrc  file to include the following lines at the bottom of the file:
The ~/.bashrc  file is simply a shell script that Bash runs whenever you launch a new terminal. You normally use this file to set various configurations. In this case, we are setting an environment variable called  WORKON_HOME   to point to the directory where our Python virtual environments live. We then load any necessary configurations from virtualenvwrapper  .
To update your  ~/.bashrc  file simply use a standard text editor. I would recommend using nano  ,  vim  , or emacs . You can also use graphical editors as well, but if you’re just getting started,  nano  is likely the easiest to operate.
A more simple solution is to use the  cat  command and avoid editors entirely:
After editing our ~/.bashrc  file, we need to reload the changes:
Note: Calling source on ~/.bashrc only has to be done once for our current shell session. Anytime we open up a new terminal, the contents of ~/.bashrc  will be automatically executed (including our updates).

Creating a virtual environment for deep learning and computer vision

Now that we have installed  virtualenv  and virtualenvwrapper, the next step is to actually create the Python virtual environment — we do this using the  mkvirtualenv  command.
In past install tutorials, I’ve presented the choice of Python 2.7 or Python 3. At this point in the Python 3 development cycle, I consider it stable and the right choice. You may elect to use Python 2.7 if you have specific compatibility requirements, but for the purposes of my new deep learning book we will use Python 3.
With that said, for the following command, ensure your Python ( -p ) flag is set to python3 :
Regardless of which Python version you decide to use, the end result is that we have created a Python virtual environment named  dl4cv  (short for “deep learning for computer vision”).
You can name this virtual environment whatever you like (and create as many Python virtual environments as you want), but for the time being, I would suggest sticking with the dl4cv  name as that is what I’ll be using throughout the rest of this tutorial as well as the remaining install guides in this series.

Verifying that you are in the “dl4cv” virtual environment

If you ever reboot your Ubuntu system; log out and log back in; or open up a new terminal, you’ll need to use the workon  command to re-access your dl4cv  virtual environment. An example of the workon  command follows:
To validate that you are in the dl4cv  virtual environment, simply examine your command line — if you see the text (dl4cv)  preceding your prompt, then you are in the dl4cv  virtual environment:
:

Figure 1: Inside the dl4cv virtual environment denoted by ‘(dl4cv)’ in the prompt.
Otherwise if you do not see the dl4cv  text, then you are not in the dl4cv  virtual environment:

Figure 2: Outside of the dl4cv virtual environment. Simply execute the ‘workon dl4cv’ command to get into the environment.

Installing NumPy

The final step before we compile OpenCV is to install NumPy, a Python package used for numerical processing. To install NumPy, ensure you are in the dl4cv  virtual environment (otherwise NumPy will be installed into the system version of Python rather than the  dl4cv  environment).
From there execute the following command:

Step #3: Compile and Install OpenCV

In this section we will install and compile OpenCV. We’ll start by downloading and unarchiving OpenCV 3.3. Then we will build and compile OpenCV from source. Finally we will test that OpenCV has been installed.

Downloading OpenCV

First let’s download opencv and opencv_contrib into your home directory:
You may need to expand the commands above to copy and past the full path to theopencv_contrib  file.
Then, let’s unzip both files:

Running CMake

Let’s create a build  directory and run CMake:
For CMake, it is important that your flags match mine for compatibility. Also, make sure that your opencv_contrib  version is the exact same as the OpenCV version you downloaded (in this case version 3.3.0 ).
Before we move on to the actual compilation step make sure you examine the output of CMake!
Start by scrolling to the section titled Python 3 .
Make sure that your Python 3 section looks like the figure below:

Figure 3: Checking that Python 3 will be used when compiling OpenCV 3 for Ubuntu.
Pay attention that the Interpreter points to our python3.5  binary located in the dl4cv  virtual environment while numpy  points to our NumPy install.
In either case if you do not see the dl4cv  virtual environment in these variables’ paths, then it’s almost certainly because you are NOT in the dl4cv  virtual environment prior to running CMake!
If this is the case, access the dl4cv  virtual environment using workon dl4cv  and re-run the command outlined above (I would also suggest deleting the build  directory and re-creating it).

Compiling OpenCV

Now we are now ready to compile OpenCV with 4 cores:
Note: You can try a version of the -j4  flag corresponding to the number of cores of your CPU to achieve compile time speedups. In this case I used -j4  since my machine has four cores. If you run into compilation errors, you may run the command make clean  and then just compile without the parallel flag: make .
From there, all you need to do is to install OpenCV 3.3 and then free up some disk space if you so desire:
When your compilation is complete you should see output that looks similar to the following:

Figure 4: OpenCV compilation is complete.

Symbolic linking OpenCV to your virtual environment

To sym-link our OpenCV bindings into the dl4cv  virtual environment, issue the following commands:
Notice that I am using Python 3.5 in this example. If you are using Python 3.6 (or newer) you’ll want to update the paths to use your version of Python.
Secondly, your .so  file (i.e., the actual OpenCV bindings) may be some variant of what is shown above, so be sure to use the appropriate file by double-checking the path.

Testing your OpenCV 3.3 install

Now that we’ve got OpenCV 3.3 installed and linked, let’s do a quick sanity test to see if things work:
Make sure you are in the dl4cv  virtual environment before firing up Python ( workondl4cv ). When you print out the version, it should match the version of OpenCV that you installed (in our case, OpenCV 3.3.0 ).
That’s it — assuming you didn’t encounter an import error, you’re ready to go on to Step #4where we will install Keras.

Step #4: Install Keras

For this step, be sure that you are in the dl4cv  environment by issuing the workon dl4cv  command. Then install our various Python computer vision, image processing, and machine learning libraries:
Next, install Tensorflow:
Notice how we are using the CPU version of TensorFlow. I will be covering the GPU versionin a separate tutorial.
Installing Keras is extremely simple, thanks to pip :
Again, do this in the dl4cv  virtual environment.
You can test our Keras install from a Python shell:
You should see that Keras has been imported with no errors and the TensorFlow backend is being used.
Before you wrap up the install tutorial take a second to familiarize yourself with the~/.keras/keras.json  file:
Ensure that image_data_format  is set to channels_last  and backend  is tensorflow .

Congratulations! You are now ready to begin your Deep learning for Computer Vision with Python journey.
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