Posts & Notes

This posts are often just small nuggets of thoughts which I use as reminders or that I write when looking for something long enough that it can be useful for others.

A surprising lua parse error

17/06/2025 · 1 minute

While working on my lua VM, I encountered the following parse error: lune> function f() local x<const> x = nil 2: local x<const> 3: x = nil ^ error: AssignToConst This error surprised me because the input is not parsable because the body of the function is never closed with an end. In the REPL of this VM, the parser is run every time a new line is added to see whether or not it …

Printing RGB colors in the terminal

03/04/2023 · 1 minute

Using terminal escape sequence: def print_rgb(r, g, b): print('\N{ESC}[48;' + f"2;{r};{g};{b}m " + '\u001b[0m', end="") This can be used in the following manner: import matplotlib cmap = matplotlib.colormaps["viridis"] for i in range(10): print_rgb(*[int(255 * c) for c in cmap(float(i / 10))[:-1]])

Fast online estimates on the GPU

06/08/2021 · 4 minutes

Estimating moments is an important step of any statistical analysis of data. The mean, variance, skewness and kurtosis of a dataset can already tell a lot about the distribution of our data. However, some datasets don’t quite fit in memory. If you have a dataset of N samples and C features where N is a lot bigger than C, you can benefit a lot by using online algorithms.

A simple image concat script

21/05/2021 · 1 minute

Usage ./image_concat.py --resize 256x256 hazelnut.png leather.png out.png Result Images from the MVTec-AD dataset. Source

Converting a python Dict into a class

07/12/2020 · 1 minute

In python, dictionnaries and classes behave differently. One of the main difference is how you access their members. In the following example, class_instance and dictionnary hold the same data. class Foo: def __init__(self): self.bar = "foo" class_instance = Foo() dictionnary = {'bar': 'foo'} print(class_instance.bar, dictionnary['bar']) # foo foo But in order to …

Keeping the same tmux session across launches

13/09/2020 · 2 minutes

Context I use alacritty as my main terminal. As fast as it is, it doesn’t come pre-configured with tabs or even other windows. So what most people do (me included), it that they use tmux. tmux is a terminal multiplexer (hence the name) which allows you to create windows and split them all over a terminal UI.

An analysis on US flights and cascading failures using PySpark

09/09/2020 · 7 minutes

Introduction In this blog post, we are going to study a dataset of US only flights during the year 2007. The dataset was released by the American Statistical Association as part of their Bi-Annual Data exposition. During the competition, participants were asked to focus on only one question and try answering it by investigating the dataset. The question we are going to try to answer is:

Google Compute Engine SSH Tunnel

01/09/2020 · 1 minute

TLDR You can create a ssh tunnel from your virtual machine to your local machine by running the following command on your local machine: