AI & Machine Learning explainers

How a model learns and how it answers — the arithmetic behind a prediction, not the metaphor.

4 interactive explainers. Each one is a visual story with a live simulation and a knowledge check, and the Ask ViLearn tutor beside all three. Free, and nothing requires an account.

Why sending the model more can make the answer worse
A context window is not memory and not storage. It is a budget you spend again from zero on every call.
Intermediate · 9 min · Story, simulation and quiz
How gradient descent makes machines learn
Strip the word 'learning' of its mystique and one small loop remains: measure how wrong you are, find which way is downhill, take a tiny step, repeat a…
Intermediate · 10 min · Story, simulation and quiz
How mixture of experts makes giant models affordable
A dense model uses every parameter for every token, so making it twice as big makes every token twice as expensive. Mixture of Experts breaks that chain.
Advanced · 11 min · Story, simulation and quiz
How an LLM picks the next word
One sentence, with the last word missing. Watch the model look back over every word it has, decide which ones matter, and turn that into a word.
Advanced · 12 min · Story, simulation and quiz

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