Browsing Tag
datascience
133 posts
Three Times I Measured Nothing
Builder Journal · Mars Environmental Dynamics Analyzer (MEDA) Virtual Sensor Recovery Ten times in a row I predicted…
RAG vs. Semantic Layer: Why AI Needs Deterministic Governance
Half the market is arguing about whether RAG or a semantic layer is the right foundation for enterprise…
From Learning Machine Learning to Competing on Kaggle: My First End-to-End Playground Competition Journey
How I applied Exploratory Data Analysis, Feature Engineering, Pipelines, and Ensemble Models to solve a real-world machine learning…
My trading system has a 73.5% win rate and loses money. Here is the diagnostic that found it.
I spent a few days auditing a live FX system I built, over 16 years of history. The…
Bootstrapped Data Products — Here’s What I Learned
I’m Heshan. I build data products. No VC, no team — just me, a lot of Playwright scripts,…
# How I Built a Retail Demand Forecasting App with Python and Streamlit
By Okparaji Wisdom | Data Scientist | Nigeria Retailers in Nigeria lose millions of naira every year to…
How I Batch-Process 100K Rows with LLMs Without Losing My Mind (or My Money)
I had a 158,000-row product catalog. Each row: a free-text description. I needed structured attributes out of it:…
Time-Series Databases vs. Relational Databases, What is the Difference
Introduction Many teams default to relational databases because they are familiar and versatile. For business systems, that choice…
Understanding Data Modeling in Power BI: Joins, Relationships, and Schemas Explained
Data modeling is how you structure your tables so Power BI understands how they connect. Get it right,…
Why Data Rarely Disappears From the Internet
Data feels temporary. You delete a post. Remove a file. Close an account. From the interface, it looks…
