03 · Practise and check
Try this yourself
Propose two different costs: blocking a genuine message and missing a spam message. Explain how those costs influence your preferred threshold.
Check your understanding
Lowering a spam decision threshold usually catches more spam but may flag more genuine messages. Measure both effects on validation data.
A mistake to avoid
A predicted probability is not automatically calibrated. A score of 0.9 does not guarantee 90% correctness without checking calibration.
Before looking at the answer, write a short explanation and one example of your own. Finish by naming one limitation of the method. Use Mark as read when you are ready, or return to the previous lesson if a term is unclear.
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