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Education platform Learning is a core part of human development. Children want to understand the world, adults want to improve their lifes and as a society we want advancement. Education still faces serios inequality problems (example). In some cases because educational material is too expensive, in many cases because having a good … Read More »

Usernames Usernames are used for identification in two places in web services: To let people log in and to allow people recognizing each other. In this article I want to share some ideas on usernames. Username vs Display name When I look into my Stackoverflow profile, they have something called "display … Read More »

Regression A while ago, this link pointed to the content which is now in the Forecasting article. Regression is one of the core tasks in machine learning. In this task, you get some input and your target variable is a single floating point number. For example, predicting the price of a … Read More »

Flask and Gunicorn Flask is a Python web framework and Gunicorn is a Python Web Server Gateway Interface (WSGI) HTTP server. Setup Install the requirements: $ pip3 install flask gunicorn Create an exampleproject.py: import random from flask import Flask app = Flask(__name__) random.seed(0) @app.route("/") def hello(): x = random.randint(1 … Read More »

Git - Version Control Done Right git is a (the!) version control system. In this article I'll try to show in a short way how to improve your usage of it. I assume you already know git clone, git commit, git push, git pull and git branch. Why Version Control When you write software, you usually … Read More »

Testing in Python Testing code is important for the following reasons: Trust: You checked at least some cases if they work. So others can have more trust in the quality of your work and youself can also put more trust in it. Breaking Changes: For a bigger project, it is sometimes hard to … Read More »

Python Style Guide Having a consistent code style for a project is important as it allows developers to code correctly without thinking too much about it. It makes code easier to read, maintain and after becomming used to the style also easier to write. Most of the time, it is not too important … Read More »

Make Python Objects JSON serializable When you're developing a service which has to communicate with a REST endpoint, it is very likely that it will come in handy if you can convert some of your objects to JSON (and back). Until recently, I always created a dictionary and used json.dumps in that case. Also … Read More »

Evaluation of binary classifiers Binary classification is likely the simplest task in machine learning. It is typically solved with Random Forests, Neural Networks, SVMs or a naive Bayes classifier. For all of them, you have to measure how well you are doing. In this article, I give an overview over the different metrics for … Read More »

Software Handover Handing over code to another person or another team is a pretty common task. You might simply get other tasks or even get another project. So, what should be done for a good handover? Preparation The first phase of the handover is preparation on your side. Make the project shine … Read More »