Writing· Supervised learning · Chapter 3 of 50
Classification: predicting a category
Understand classification through labeled fruit pictures, new inputs, and a category recognition activity.
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Writing on AI engineering
Notes and how-tos on building with LLMs — prompting, agents, retrieval, and evaluation. Written to help other engineers ship AI features that hold up in production.
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- Writing· Supervised learning · Chapter 2 of 50
Regression: estimating an amount
Understand regression through known sale prices, a new home, and a simple price-gap experiment.
- Writing· Supervised learning · Chapter 1 of 50
Learning from examples
Understand model, learning, and prediction through completed deliveries, a playable example, and a numbered chapter infographic.
- Writing· RAG series · Part 10
Citations Are Not Evidence
Follow the pointer. Then check the passage.
Review a fictional answer at Sachin. Follow its citations, repair missing support, and inspect how citation recall and precision are calculated. An illustrated review desk and a runnable JavaScript example connect the story to the mechanism.
- RAG
- Writing· RAG permissions
Build it. Then try to break it.
Follow one request from the badge desk to the response.
Run a local permission-aware answer service. Test forged group claims, tenant isolation, revoked access, stale caches, and source requests.
- RAG
- Writing· RAG permissions
Protect the whole answer, including its sources.
The envelope matters as much as the letter.
Inspect four places information can escape an otherwise filtered answer: citations, previews, shared answers, and diagnostics.
- RAG
- Writing· RAG permissions
Access was revoked. What happens now?
Yesterday’s stamp cannot prove today’s permission.
Step through a permission change at the source, a stale index, and an old cached answer. Learn where current checks belong.
- RAG
- Writing· RAG permissions
Find the best evidence this person may read.
Five requested does not always mean five returned.
Move a retrieval cutoff and see why removing denied results can leave a short answer packet. Measure recall against an allowed baseline.
- RAG
- Writing· RAG permissions
A document’s permissions must travel with it.
A photocopy does not acquire new readers.
Follow a restricted folder through the copy room. Preserve its permissions on every chunk and reject missing labels.
- RAG
- Writing· RAG permissions
Same question. Different permissions.
A great match is not a permission slip.
Predict how an employee’s identity changes a RAG answer, inspect the permission decision, and run the same policy yourself.
- RAG
