[D] How does GPT understand what it does not know?

https://preview.redd.it/kf5t2k95arvc1.png?width=625&format=png&auto=webp&s=5631d9b49084815d44c2178e1b27cfd4926f6f59

I was to look up Cramer distance and GPT spots that I made a typo before I realized it.

How did GPT understand the input might be wrong rather than always assume the input is right? Is this also done in an end-to-end manner, or what are additional procedures if there are any to identify the possible uncertainty in the input?

I guess in general I'm just curious that how does GPT know it may not have an answer?

gpt identify look look up machinelearning uncertainty