Everyday Data Science: applied AI, agentic systems, machine learning, and AI in Africa, written by practitioners for people who build.

MCP, Explained for Data People: It Standardizes the Plumbing, Not the Thinking

MCP standardizes how agents connect to data and tools: three roles, three primitives, one wire format. I built a minimal server and ran it end to end; here is what the protocol guarantees, and the security fine print most tutorials skip.

Ibrahim Denis Fofanah·9 min

The Battle for the Agentic Interface: Meta Muse, OpenAI Dots and Grok Bot

Meta Muse, OpenAI Dots and Grok Bot point to a new AI interface: persistent agents that can use tools, maintain state and keep working after the chat ends.

Rodriquez Allen·9 min

Build a RAG System That Knows When It Doesn't Know

A practical AI engineering tutorial on building a retrieval-augmented generation system with semantic search, confidence checks, grounded answers, and a simple evaluation layer.

Rodriquez Allen·8 min

Gradient Boosting Still Rules Tabular Data. The Foundation Models Are Gaining Ground.

Four years after a 45-dataset benchmark crowned gradient-boosted trees on tabular data, tabular foundation models (TabPFN, LimiX-2, NVIDIA's Kumo Tabular) are topping leaderboards. What the 2022 verdict got right, where it no longer holds, and how to choose your next tabular model.

Ibrahim Denis Fofanah·13 min

pandas vs Polars vs DuckDB on 3.5 Million Taxi Rides. DuckDB Won Every Query, and the Timings Were the Least Interesting Part.

I ran pandas, Polars, and DuckDB through the same 3.5M-row NYC taxi CSV on a 7GB box. DuckDB won every query and used half the memory of pandas, but the most useful finding was a CSV parsing gotcha, not a timing.

Ibrahim Denis Fofanah·6 min

Your Retry Worked. That Is How You Got Two Rows.

Retries fix transient failures, but they can also duplicate payments, records, and side effects. Here is how idempotency keys, unique constraints, and atomic writes make retries safe.

Ibrahim Denis Fofanah·8 min

RAG Systems Collapse When They Retrieve Their Own Writing. One Self-Authored Document Can Start It.

79.6% of 1,528 RAG simulations collapsed when the model retrieved documents it had authored itself, and a single self-written reference can trigger it. If your pipeline indexes its own output, this paper is about you.

Ibrahim Denis Fofanah·6 min

Quantizing Half the Attention Hurt. Quantizing Both Paths Barely Did.

Quantizing one attention path cost TabPFN-v3 as much as 31.8 Elo. Quantizing both cut the drop to roughly one point and enabled up to 1.7× faster inference. The result is a lesson about consistency, not just FP8.

Ibrahim Denis Fofanah·12 min