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this post was submitted on 18 Oct 2024
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This is why you can’t have an AI make decisions on activities that could kill someone. AI models can’t say “I don’t know”, every input is forced to be classified as something they’ve seen before, effectively hallucinating when the input is unknown.
I'm not very well versed in this but isn't there a confidence value that some of these models are able to output?
All probabilistic models output a confidence value, and it's very common and basic practice to gate downstream processes around that value. This person just doesn't know what they're talking about. Though, that puts them on about the same footing as Elono when it comes to AI/ML.
Right, which is why that marvelous confidence value got somebody ran over.
Are you under the impression that I think Teslas approach to AI and computer vision is anything but fucking dumb? The person said a stupid and patently incorrect thing. I corrected them. Confidence values being literally baked into how most ML architectures work is unrelated to intentionally depriving your system of one of the most robust ccomputer vision signals we can come up with right now.
Yes, but confidence values are not magic. These values are calculated based on how familiar the current input is to a previous observed input. If the type of input is unfamiliar to the model, what do you think happens? Usually, there will be a category with a high enough confidence score so that it will be chosen as the correct one, while being wrong. Now, assuming you somehow manage to not get a favorable confidence score for any decision. What do you think happens in that case? I never encountered this, but there can only be 3 possible paths: 1) Choose a random value. Not good. 2) Do nothing. Not good. 3) Rerun the model with slightly newer data? Maybe helps, but in the case of driving a car, slightly newer data might be too late.
There's plenty you could do if no label was produced with a sufficiently high confidence. These are continuous systems, so the idea of "rerunning" the model isn't that crazy, but you could pair that with an automatic decrease in speed to generate more frames, stop the whole vehicle (safely of course), divert path, and I'm sure plenty more an actual domain and subject matter expert might come up with--or a whole team of them. But while we're on the topic, it's not really right to even label these confidence intervals as such--they're just output weighting associated with respective levels. We've sort of decided they vaguely match up to something kind of sort approximate to confidence values but they aren't based on a ground truth like I'm understanding your comment to imply--they entirely derive out of the trained model weights and their confluence. Don't really have anywhere to go with that thought beyond the observation itself.