Urban Mining – Steel Scraps

While I intuitively like the concept of Urban Mining – we have all these precious raw materials within easy reach of robots – I know nothing about it. I want to remedy that with the best ignorance cure of all:…

How to do backpropagation in Numpy

I have adapted an example neural net written in Python to illustrate how the back-propagation algorithm works on a small toy example. My modifications include printing, a learning rate and using the leaky ReLU activation function instead of sigmoid. import…

My Dad’s Early Life Story

In this post I will give a brief overview of my father’s (Georgios Kefaloukos) many activities in the early part of his life. After dinner today I decided to ask him about his life story, and took as many notes…

No one in ad tech needs to know your name

I work in the ad tech industry, which means that I track people online for a living. Mainly, I do it because the industry has interesting computer science problems and because the job pays well. I will not defend ad…

My recipe for dal

I love dal. Here is my simple recipe, which draws it’s inspiration from both India and the Mediterranean Region. Ingredients: – 200-300 g split red lentils – 1 onion – 2-3 cloves of garlic – 1 can of crushed tomatoes…

Ether mining – first attempt

This guide outlines my first (and failed) attempt at mining Ether on AWS. I will first show how I set up a GPU instance to mine Ether. Then I will conclude on the profitability of the whole endeavour in a…

Python script for geocoding a text file

Assume that you have a file with some locations as text with one location per line. For example, here are some school names in Copenhagen, Denmark, stored in schools.csv: Hyltebjerg Skole Heibergskolen Ellebjerg Skole Katrinedals Skole Peder Lykke Skolen Amager…