Enkele weken geleden was ik op een uiteenzetting door Google voor de retail-sector. Ik ben altijd sceptisch als het over zo’n conferenties gaat, maar toegegeven, ik was aangenaam verrast. Als kers op de taart kreeg elke aanwezige ‘Digitalis’ mee naar huis, het boek van de hand van Thierry Geerts, CEO…
Personally, Random Forest is one of my favorite algorithms for supervised learning. It’s quick and dirty and still allows for some interpretation. However, R and the RandomForest package are somewhat cryptic when it comes to requirements not met to properly train the algorithm. I bumped a lot into this error…
In R, it often happens that I need to calculate the share of each column by row. In this very simple example I would like to update the following table: apples oranges bananas pineapples 2 4 6 3 1 0 9 2 5 1 2 3 and I would like…
If you are running into this error in R, chances are that you are running a recursive function that runs too deep. I found this page to be particularly good in explaining the concept. But here’s an example: In this example, we run the pop_pringles function and we will keep…
Taking a Docker course, building your first image and nothing happens? Here’s why and how to solve this issue. When you run the docker build command, the Docker client will send the “context” of your Dockerfile via REST to the Docker daemon. This “context” is the content of what is…
Exactly one month ago, I was watching Google I/O at a tech company in my city, Gent. Free pizza and beer, and generally a cool office to hang out at. Every bite I took out of a slice of pizza was accompanied with one thought: “just show us the damn…
When taking Docker tutorials, one of the first things that pops up is running a web server in a container via Nginx. However, when you map ports (e.g. 80 on 80) you might get the following error: Error response from daemon: driver failed programming external connectivity on endpoint <your container>:…
One of the main reasons I prefer R(Studio) over Python for doing data science in a context of business intelligence is the ease and stability of the workspace: no virtual environments to maintain since most popular libraries have matured. An update once a year suffices. Yet I acknowledge Python is…
It’s a classic business economics story: in 1975 Sony released the Betamax video tape format, a year ahead of JVC which released the VHS video tape format. Despite the first mover advantage of Betamax, VHS conquered the market from the 80’s onward. Due to network effects, once VHS surpassed Betamax,…
Setting up an (integrated) webcam to use in Ubuntu inside VirtualBox can be a tough nut to crack. However, with this guide, it should only take you a couple of minutes. If you’re running Microsft Windows as your host operating system (OS), open an elevated command prompt (right click on…