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Issue #117 - Scaling Vector Search: HNSW and Approximate Search

With a million vectors, brute-force search (checking every single one) is like trying to find a specific person in a packed stadium by tapping every…

3 hrs ago • David Andrés

December 2025

MLPills - Year in Review 2025

If we had to summarize 2025 in one sentence, it would be: The year we moved from “Prompts” to “Systems.”

Dec 28, 2025 • David Andrés

Issue #116 - Introduction to Vector Search

For decades, search engines operated on a simple premise: exact matching. If you searched for “car troubleshooting,” the engine looked for documents…

Dec 21, 2025 • David Andrés

Issue #115 - Reranking in your RAG pipeline

If you are building an AI application today, you are likely using RAG (Retrieval-Augmented Generation). It is the standard architecture for giving Large…

Dec 14, 2025 • David Andrés

Issue #114 - The Landscape of Time Series Forecasting

Time series analysis involves examining a sequence of data points collected over time to uncover hidden patterns. By analyzing historical data, we can…

Dec 6, 2025 • David Andrés

November 2025

Issue #113 - Interpreting XGBoost predictions

Modern machine learning models are often capable of impressive predictive performance, but they are also criticised for being opaque. Understanding not…

Nov 30, 2025 • David Andrés

Extra #1 - Orchestrator-Worker Pattern in LangGraph (Parallel Execution)

✨Extra Pill of the Week

Nov 26, 2025 • David Andrés

DIY #18 - Orchestrator-Worker LLM Agent with LangChain

Imagine you’re managing a complex research project. You need to analyze a company’s financial health, but that requires gathering quarterly reports…

Nov 23, 2025 • David Andrés

Issue #112 - Stationarity in Time Series and how to handle it

In the context of time series analysis, a time series is said to be stationary when its statistical properties such as the mean, variance, and…

Nov 15, 2025 • David Andrés

Issue #111 - Measuring String Similarity

String similarity is one of those problems that seems simple on the surface but reveals surprising depth the moment you start working with real data. At…

Nov 8, 2025 • David Andrés

DIY #17 - Parallelisation with LangChain

Imagine you’re a news editor trying to understand a breaking story. You get a single field report. To really cover it, you need to know the “who, what…

Nov 1, 2025 • David Andrés

October 2025

Issue #110 - LLM Workflow Patterns

Large Language Models (LLMs) have moved far beyond the early days of simple prompt-and-response systems. They can now reason, plan, critique, and even…

Oct 25, 2025 • David Andrés

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