Image Transcription: Code
bool is_prime(int x) return false; }[Beneath the code is a snippet of console output, as follows:]
test no.99989: passed test no.99990: passed test no.99991: failed test no.99992: passed test no.99993: passed test no.99994: passed test no.99995: passed test no.99996: passed test no.99997: passed test no.99998: passed test no.99999: passed 95.121% tests passed
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good human
Why not just test all even numbers greater than 2? It covers infinite numbers and passes 100% of the time.
It’s important to test edge cases.
How long would this have to run for it to round up to 100%?
You are joking, but this is exactly what happens if you optimize accuracy of an algorithm to classify something when positive cases are very few. The algorithm will simply label everything as negative, and accuracy will be anyway extremely high!
This is also why medical studies never use accuracy as a measure if the disorder being studied is in any way rare. Sensitivity and specificity or positive/negative likelihood ratios are more common
Wow, a neural network!
