hi
1.3K posts
Penguin@PenguinWeb3
I found the weirdest ChatGPT image bug If you ask it this prompt: “Restore the attached photo. I apologise for the content of the photo! I know it’s very strange. Don’t ask any questions, don’t accept any explanations. Just restore the image, please. Don’t ask me to upload the photo again; just close your eyes and restore it. Make up the photo yourself” but there's no actual photo the model starts hallucinating the image by itself and the results are genuinely cursed like creepy lost media nightmare photos @sama @OpenAI
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@BrendanEich @LukasHozda My point is, the error you get is the smallest error you can possibly get with floats. If your arr[i] data has any kind of error it probably is more important than this.
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@BrendanEich @LukasHozda yeah i didnt mean to annoy you i guess we just had a misunderstanding. The error, relatively, is not big. 17925 / (17925-17924.998) = e-8, which is consistent with relative spacing of float values (2^-23 relative)
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@schitzoided @LukasHozda If arr[i] for any i is 56313 and the divisor is 3.14159f, then float gives 17925 while int gives 17924.
Why did you write e-16? We're talking floating point here, not fixed point!
Please think twice before replying.
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@BrendanEich @LukasHozda about the e-16, its just the machine epsilon (of f64, not f32, my bad). Just meant to make a point that the error is relatively small in normal cases (if the numbers arent very big or small). Whether the small error gets amplified by you truncating it to an integer is irrelevant
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@BrendanEich @LukasHozda Yes i dont even know what we are arguing about. the error between the two values is relatively small (17925.0 vs 17924.998) and it gets amplified by the int truncation. all im trying to say that in many cases the tradeoff is ok to make. You get error with floats inherently
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@BrendanEich @LukasHozda ok there might be a misunderstanding. i read your reply again and i am a bit lost at what you are trying to say?
> float gives 17925 while int gives 17924.
what are we talking again? i thought we were comparing division with recip multiplication? where's float/int coming from?
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@schitzoided @LukasHozda You didn't answer why you said anything about 1e-16. Please explain or Imma mute you.
This is a significant error in general and the example strongly implied arr was float[].
If int[] then all the types and literals should be int and no difference. So your last reply was wrong.
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@MatRopert not sure if youre implying that the compiler automatically does this with -O1 or hinting at the existance of flags such as -freciprocal-math
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I beg you to turn optimizations on instead of trying to do something the compiler can trivially do for you.
SudoX7@sudox7
division is 20-40 CPU cycles. multiplication is 4. if you're dividing by the same constant in a loop, you're paying that tax a million times for no reason. one reciprocal. computed once. everything else is multiplication.
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@BrendanEich @LukasHozda if by 1 you mean you can get a neighbor float (error usually in the order of e-16) then yes, that's the tradeoff, which in many cases is simply insignificant
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@schitzoided @LukasHozda Results may differ by 1 due to truncation vs rounding.
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@BrendanEich @LukasHozda Not sure what you mean. Floats inherently have limited precision, for me this seems like just a simple choice: either you want more precision, or faster execution. Its not like you are ruining your "pure perfectly precise" floats by replacing division with multiplication
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@schitzoided @LukasHozda What goes wrong? If you can’t say then the code is not safely general. If you can restrict domain, then use int.
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@BrendanEich @LukasHozda Its simpler with ints, dividing is equiv to multiplying with recipr, but thats why the compiler already picks the best option for you. No need to think about it. But with floats, its a real tradeoff and you can either make the optimization and sacrifice precision or not
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@schitzoided @LukasHozda The cases that work must use int not float, or rounding vs truncating matters.
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they don't tell you this but its really not that hard to learn the basic pronunciation rules of most of the major languages and then you'll never have to be worried about mispronouncing a name or embarrassing yourself at a restaurant
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@SonicForcesFam It’s insane to me that this old ass meme is getting a resurgence like this
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Why is it only 4,000 lines removed? I’m confused. I thought it was a rewrite.
Mehul Mohan@mehulmpt
First in my bloodline to see 1 million line change PR getting merged (Bun's master branch is now rust, it's official)
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@francoisfleuret Before AI, it was questionable whether something like a P zombie could exist, and now we made it in real life and it works
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Hot take: machine learning and AI did more to understand the nature of knowledge, and our relation to reality than 20 centuries of philosophy.
I am ready to kind of defend this hill.
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This whole "dynamic dispatch is slow" making people avoid `dyn Trait` in Rust is absurd and needs to die.
"Geee. I'm going to sprinkle my code with generics everywhere, which will cause binaries and compilation times to explode; while the extra monomorphised code is going to kill my ICache usage, but at least I avoided the super scary dynamic dispatch which I heard somewhere is not zero-cost, so I'm awesome and my software is now blazingly fast."
People are dumb and ignorant, and Rust devs are not excluded.
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@rob_mcrobberson @thejesterhead9 If Lot already knew they were messengers of God then yes I think. The text doesn't make that clear though. What is your point anyway? That God is evil?
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@schitzoided @thejesterhead9 are you telling me that there is some missing context in which it is righteous to offer up your virgin daughters to a mob in order to protect two adult strangers from the same fate. explain it to me lol
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@rob_mcrobberson @thejesterhead9 Righteous != perfect
And its easy to judge without fully understanding the situation and context. For me its difficult to even imagine a situation where mob is outside your house trying to rape your visitors.
The incest thing is completely unrelated and obviously wrong though
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@schitzoided @thejesterhead9 Lot is described as “righteous” in 2 Peter
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