https://sergiomorapardo.github.io/writing/Technical notes on applied machine learning and AI systems.Hugoen-UShttps://sergiomorapardo.github.io/writing/cross-validation-that-matches-the-data/https://sergiomorapardo.github.io/writing/cross-validation-that-matches-the-data/Sun, 06 Sep 2026 00:00:00 -0500A defensible model-selection workflow: choose splits from the data-generating process, keep preprocessing inside each fold, and separate tuning from evaluation.https://sergiomorapardo.github.io/writing/node2vec-recommendations/https://sergiomorapardo.github.io/writing/node2vec-recommendations/Sun, 06 Sep 2026 00:00:00 -0500A practical route from MovieLens interactions to graph embeddings, along with the evidence and limits needed before calling the result a recommender.