Advent

Data Science Highlight: Chosen Problems from Advent of Code 2025

is an annual advent calendar of programming puzzles which might be themed around helping Santa’s elves prepare for Christmas. The whimsical setting masks the proven fact that many puzzles call for serious algorithmic...

The Machine Learning “Advent Calendar” Bonus 2: Gradient Descent Variants in Excel

use gradient descent to seek out the optimal values of their weights. Linear regression, logistic regression, neural networks, and enormous language models all depend on this principle. Within the previous articles, we used...

What Advent of Code Has Taught Me About Data Science

within the , a series of each day programming challenges released throughout December, for the primary time. The each day challenges normally contain two puzzles constructing on an identical problem. Although these challenges...

The Machine Learning “Advent Calendar” Bonus 1: AUC in Excel

, we'll implement AUC in Excel. AUC is normally used for classification tasks as a performance metric. But we start with a confusion matrix, because that's where everyone begins in practice. Then we'll see why a...

The Machine Learning “Advent Calendar” Day 24: Transformers for Text in Excel

of my Machine Learning Advent Calendar. Before closing this series, I would really like to sincerely thank everyone who followed it, shared feedback, and supported it, specifically the Towards Data Science team. Ending this calendar...

The Machine Learning “Advent Calendar” Day 23: CNN in Excel

were first introduced for images, and for images they are sometimes easy to know. A filter slides over pixels and detects edges, shapes, or textures. You possibly can read this text I wrote earlier...

The Machine Learning “Advent Calendar” Day 20: Gradient Boosted Linear Regression in Excel

, we ensemble learning with voting, bagging and Random Forest. Voting itself is simply an aggregation mechanism. It doesn't create diversity, but combines predictions from already different models.Bagging, however, explicitly creates diversity by training...

The Machine Learning “Advent Calendar” Day 21: Gradient Boosted Decision Tree Regressor in Excel

previous article, we introduced the core mechanism of Gradient Boosting through Gradient Boosted Linear Regression. That example was deliberately easy. Its goal was not performance, but understanding. Using a linear model allowed us to make...

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