Donadas Brutas

Flag of Occitania, Occitan cross in orange cross.

Welcome to my blog, Donadas Brutas. Any kind of feedback is appreciated, so feel free to reach out. Thanks for your interest and time.

2026

October 26, 2026

ROC Curve and Precision-Recall

evaluation
risk
precision
recall
classification
machine learning

We Will, We Will ROC You: a long story on ROC and Precision-Recall curves.

Receiver operating characteristic (ROC) curves on the right part of the image, in the middle density distribution for the two class conditional distributions, left part widgets controlers.
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2025

October 20, 2025

Optimal prediction sets for plant identification: an interactive guide.

Conformal prediction
classification
machine learning
Pl@ntNet

Insights and visualization of conformal prediction in the context of long-tailed classification. Challenges from citizen sciences platforms like Pl@ntNet.

Example of a 2D classification problems with three classes, the associated Bayes classifier and the data. Color of points and regions indicate the three possible labels. The left one (in green) is a rare class.

September 9, 2025

Gaussian elimination in a glimpse

linear algebra
math visualization

Gaussian elimination in action: a simple visualization of a famous algorithm.

An animated gif showing a matrix displayed with imshow, with the values the matrix evolving according to Gaussian elimination, mean the matrix becomes progressively more and more triangular.
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2024

November 10, 2024

Isotonic regression

Quadratic programming
Calibration
PAVA
Optimization

Iso, Iso, Iso ... Tonic! Or how to fit a non-decreasing signal.

Clouds of points (black) and a non-decreasing step-wise function approximating it (red). It's actually the projection of the vector representing the cloud of points onto the set of vectors with non-decreasing coordinates.

September 5, 2024

LaTeX for scientific writing?

Latex
writing

Some guidance on why, when, and **when not** using it.

Extract of a page of a book, illustrating LaTeX formula.

September 3, 2024

Soft-max and Soft-argmax

statistics
optimization
machine learning

Back to exponential weights and log-sum-exp functions

Triangle representing the probability simplex and colors representing level-sets inside.

September 2, 2024

Public civil servant salaries and inflation

news
code
data science
economics

Bye bye public civil servants.

Time series showing curves going up with one way quicker that the other.

September 1, 2024

Welcome to Donadas Brutas!

news

Let's start blogging here, we'll see how it goes...

Animation on an hexagon, with recursive hexagons inscribed in it, whose corners vary along the sides of the previous layer.
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The blog post listing is based on the website source of Marvin Schmitt, itself inspired by Andrew Heiss, who has put together an incredible listing template under CC-BY-SA 4.0 license. Thanks to both!