About a month ago RStudio published on CRAN a nice package keras. This package is an interface to a famous library keras, a high-level neural networks API written in Python for using TensorFlow, CNTK, or Theano. In this post, the focus is on TensorFlow, as default backend engine developed by Google.

Even though RStudio is not the first who developed such an interface (see kerasR), they usually build robust and stable tools and software. Official documentation shows a pretty straight-forward way how to install and use the package. However, the installation procedure assumes to use Python 2.7 (default Python on macOS). As long as I also use Python and prefer to use 3.6 I decided to write a little guide for installation all the data science tools related to Python.

I assume that the user has a macOS system and preinstalled gcc (GNU Compiler Collection). During its first start RStudio propose to install gcc. To check if it is installed simply type in terminal

gcc --version

which should return a version or command not found otherwise. No other prerequisites are needed.

1. Install Python 3

First, a package manager Homebrew :beer: should be installed. No worries if you are not very familiar what’s that. Simply execute this command in Terminal:

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Then, we need to place Homebrew directory at the top of PATH environment variable. Wait, what?! OK, just execute this command to open command line text-editor nano

nano ~/.bash_profile

and paste this line export PATH=/usr/local/bin:$PATH. Close and open Terminal or execute

source ~/.bash_profile

to make these changes active. Finally, actually install Python 3 by:

brew install python3

To check if it’s installed properly, type

python3 --version

which should return a version of Python. Nice thing that Homebrew installs pip3 (a package manager for Python libraries) automatically.

2. Install TensorFlow

I personally prefer to install TensorFlow with “native” pip approach instead of virtualenv, since I do not have many projects relying on different packages’ versions. Thus, to install TensorFlow it’s enough to

pip3 install tensorflow

3. Install keras

It is also as simple as installing TensorFlow:

pip3 install keras

should do the trick.

3.1. Bonus: Install Rodeo IDE

I am addicted to sweet RStudio IDE. I had several attempts of trying Python, but I was always disappointed and pissed off by ugly IDE. Until I discovered Rodeo. Alright, maybe it’s a bit buggy, but at least it does not look like Windows XP-ish retired lady Spyder. Guys, let’s have a bit of a taste :innocent:

The easiest way to install Rodeo is to download and install it from .dmg file. During the first start-up Rodeo probably will ask to install several required packages. Since we did not install Anaconda distribution, we need to do it manually:

pip3 install jupyter_client ipykernel numpy pandas matplotlib jupyter

Then, Rodeo will ask to specify Python command. It is enough to insert python3 to the input box.

4. Install and configure R package keras

There should not be any problems to install the package by a standard way from CRAN:

install.packages("keras")

Standard installation procedure assumes, then, install Keras and TensorFlow by install_keras(). However, we have already installed these guys in conjunction with Python 3. Instead, we use alternative way of installation suggested by this page, i.e. locate TensorFlow and Python. Type

use_python("/usr/local/bin/python3")

to specify a path to Python 3. Restart RStudio. Load keras library and get your hands dirty. Voilà! Unless you screwed up somewhere (which is usually the case for me), everything should work nicely.

Sources: 1, 2, 3, 4, 5

Picture by Statistical Statistics Memes