Interactive Playgrounds
Don't just read about it, turn the knob.
In the age of AI, the real skill isn't writing code, it's understanding the system well enough to steer it. Every playground below runs live in your browser: drag a control, watch the output move, and build the intuition of someone who truly gets how it works.
Model simulators
Drag the levers of a real trained model and watch the prediction — and every feature's contribution — move. These are the live models behind the tested Projects.
Credit scorecard
Score a loan applicant → default probability, approve/decline, and the contribution behind it.
free◉Churn scorecard
Will this customer churn? Live probability plus what’s driving the risk.
free◉Fraud scorer
Score a transaction → fraud probability and why it was flagged.
free◉Attrition scorecard
An employee’s flight-risk score and the factors behind it.
free◉House-price predictor
Drag income, rooms and location → predicted home value + contributions.
free◉Progression predictor
Predict one-year disease progression from a patient’s measurements.
free◉Insurance pricer
Predict an annual premium — watch smoking dominate the price.
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🎓 These are a new kind of lab, explorables, not worksheets. Each one pairs with a lecture in your journeyopen a playground and you'll find a "📖 Read the lecture notes" link back to the concept it teaches.