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My thousand dollar iPhone can't do math

https://journal.rafaelcosta.me/my-thousand-dollar-iphone-cant-do-math/
86•rafaelcosta•3h ago

Comments

bri3d•1h ago
I love to see real debugging instead of conspiracy theories!

Did you file a radar? (silently laughing while writing this, but maybe there's someone left at Apple who reads those)

the_arun•1h ago
Is it a clickbait? Can’t it do math or run llm?
bri3d•1h ago
Somewhere along the line, the tensor math that runs an LLM became divergent from every other Apple device. My guess is that there's some kind of accumulation issue here (remembering that floating-point accumulation does not usually commute), but it seems genuinely broken in an unexpected way given that Apple's own LLM also doesn't seem to work on this device.
ploum•1h ago
Well it seems that, those days, instead of SUM(expense1,expense2) you ask an LLM to "make an app that will compute the total of multiple expenses".

If I read most of the news on this very website, this is "way more efficient" and "it saves time" (and those who don’t do it will lose their job)

Then, when it produces wrong output AND it is obvious enough for you to notice, you blame the hardware.

bri3d•1h ago
I mean, Apple's LLM also doesn't work on this device, plus the author compared the outputs from each iterative calculation on this device vs. others and they diverge from every other Apple device. That's a pretty big sign that both, something is different about that device, and this same broken behavior carried across multiple OS versions. Is the hardware or the software "responsible" - who knows, there's no smoking gun there, but it does seem like something is genuinely wrong.

I don't get the snark about LLMs overall in this context; this author uses LLM to help write their code, but is also clearly competent enough to dig in and determine why things don't work when the LLM fails, and performed an LLM-out-of-the-loop debugging session once they decided it wasn't trustworthy. What else could you do in this situation?

lxgr•1h ago
LLMs are applied math, so… both?
Buttons840•1h ago
I clicked hoping this would be about how old graphing calculators are generally better math companions than a phone.

The best way to do math on my phone I know of is the HP Prime emulator.

VorpalWay•1h ago
I run a TI 83+ emulator on my Android phone when I don't have my physical calculator at hand. Same concept, just learned a different brand of calculators.
vanviegen•1h ago
Perfect conclusion: my expensive and rather new phone is broken by design, so I just buy an even newer and more expensive one from the same vendor.

The heroic attempt at debugging this though makes me sympathize with all of those engineers that must be doing low-level LLM development these days and getting just noise out of their black boxes.

ohyoutravel•1h ago
This is a vibe coded slop app.
raincole•1h ago
Low level numerical operation optimizations are often not reproduceable. For example: https://www.intel.com/content/dam/develop/external/us/en/doc... (2013)

But it's still surprising that that LLM doesn't work on iPhone 16 at all. After all LLMs are known for their tolerance to quantization.

bri3d•1h ago
Yes, "floating point accumulation doesn't commute" is a mantra everyone should have in their head, and when I first read this article, I was jumping at the bit to dismiss it out of hand for that reason.

But, what got me about this is that:

* every other Apple device delivered the same results

* Apple's own LLM silently failed on this device

to me that behavior suggests an unexpected failure rather than a fundamental issue; it seems Bad (TM) that Apple would ship devices where their own LLM didn't work.

lionkor•1h ago
I could not parse most of this article. So, it's all vibe coded and you're blaming the silicon?
bri3d•52m ago
> Or, rather, MiniMax is! The good thing about offloading your work to an LLM is that you can blame it for your shortcomings. Time to get my hands dirty and do it myself, typing code on my keyboard, like the ancient Mayan and Aztec programmers probably did.

They noticed a discrepancy, then went back and wrote code to perform the same operations by hand, without the use of an LLM at all in the code production step. The results still diverged unpredictably from the baseline.

Normally, expecting floating-point MAC operations to produce deterministic results on modern hardware is a fool's errand; they usually operate asynchronously and so the non-commutative properties of floating-point addition rear their head and you get some divergence.

But an order of magnitude difference plus Apple's own LLM not working on this device suggests strongly to me that there is something wrong. Whether it's the silicon or the software would demand more investigation, but this is a well reasoned bug in my book.

ErroneousBosh•45m ago
> Time to get my hands dirty and do it myself, typing code on my keyboard, like the ancient Mayan and Aztec programmers probably did.

https://ia800806.us.archive.org/20/items/TheFeelingOfPower/T...

I should think I'll probably see someone posting this on the front page of HN tomorrow, no doubt. I first read it when it was already enormously old, possibly nearly 30 years old, in the mid 1980s when I was about 11 or 12 and starting high school, and voraciously reading all the Golden Age Sci-Fi I could lay my grubby wee hands on. I still think about it, often.

decimalenough•51m ago
My TL;DR is that they tried to run an on-device model to classify expenses, it didn't work even for simple cases ("Kasai Kitchin" -> "unknown"), they went deeeeeep down the rabbit hole to figure out why and concluded that inference on their particular model/phone is borked at the hardware level.

Whether you should do this on device is another story entirely.

jojobas•46m ago
Why shouldn't you? It's your device, it has hardware made specifically for inference.

What's to be gained, other than battery life, by offloading inference to someone else? To be lost, at least, is your data ownership and perhaps money.

dghlsakjg•27m ago
> What's to be gained... by offloading inference to someone else?

Access to models that local hardware can't run. The kind of model that an iphone struggles to run is blown out of the water by most low end hosted models. Its the same reason that most devs opt for claude code, cursor, copilot, etc. instead of using hosted models for coding assistance.

PlatoIsADisease•1h ago
You don't buy Apple products because of the quality, you buy it because its more expensive than the value of it. Its a demonstration of wealth. This is called Veblen good, and a phenomena called out as early as Thomas Hobbes.

What you need to do is carry 2 phones. A phone that does the job, and a phone for style.

I didn't invent the laws of nature, I just follow them.

ohyoutravel•55m ago
This is a conclusion that comes with some personal baggage you should identify and consider addressing.
gambiting•52m ago
I mean, I think it's cultural. In US it seems like everyone has an iphone, it's almost kinda quirky not to have one. But in some other places, an iPhone is more than your monthly salary - having one is definitely a symbol of status. Less so than it used to be, but it still has that.
ohyoutravel•49m ago
Fair, but that’s a comment on a US-centric website, run by a US-centric company, in a US-centric industry, on a US-centric medium. So if they didn’t mean US, I think the onus is on them to clarify exactly where this applies.
dghlsakjg•15m ago
iPhones in the US have an estimate ~55% market share depending on source. Owning an Android wasn't unusual in the least when I lived there, and appears to be pretty popular.

I don't think its unusual that a country with high median income and higher average income will tend to gravitate towards more expensive phones. Given that Apple doesn't make a cheap phone, it kind of follows that wealthier countries will buy more iPhones.

Of course the opposite is true as well, In a country where an iPhone is measured in months of salary, they won't sell well, but I'd be willing to bet that Androids in that price tier sell like shit in those countries too.

Is it a status symbol? arguably. But it also correlates pretty strongly with median income.

PlatoIsADisease•49m ago
Admittedly, I hate companies that live off their marketing. Nintendo, Disney, Apple. I hate that these companies can weaponize psychology against humans.

Function > Form.

I think its a Hero Complex, if Jung is correct.

kulahan•41m ago
All three of these companies are supremely dedicated to the customer experience. It’s a weird thing to be annoyed at. Ninty is the only company really experimenting with gaming hardware. Disney parks are a thesis on hiding the “behind the scenes” stuff perfectly. Apple does its best to make things just kinda work well, and if you’re in their ecosystem fully, it usually does work out.

Not everyone cares for the most capable device on the planet. Sometimes people just want a pretty familiar and easy experience. I haven’t used my phone for anything more than browsing the web and texting in ages. I absolutely don’t care about whatever function you think I’m missing due to Apple, honestly.

As a side note, the fathers of Psychology were absolutely terrible scientists. The entire field almost failed because they took it so far into pseudo-science land. Of course Jung isn’t correct.

DJBunnies•33m ago
Macbooks and iPhones are good devices though, saying this as a primarily linux user.

There is no way a company could exist purely on marketing, Apple backs it up with tech.

raw_anon_1111•25m ago
Yes because 60% of US phone buyers buy an iPhone to stand out from the average US phone buyer and they shouldn’t because it doesn’t run local llm’s well?
dghlsakjg•2m ago
I severely doubt your thesis around iPhones being Veblen goods.

You are claiming that if the price of the iPhone went down, apple would sell fewer phones?

Correspondingly, you are arguing that if they increased prices they could increase sales?

You are claiming that 100s of millions of people have all made the decision that the price of an iPhone is more than it is worth to them as a device, but is made up for by being seen with one in your hand?

Not all goods that signify status are Veblen goods.

giancarlostoro•38m ago
I closed the article when I read the first sentence. LLMs are not the first thing I grab when I want to do math, they're maybe the second tool.
Playboi_Carti•32m ago
It's not about LLMs doing math.
bri3d•29m ago
If you’d read the whole thing, you would go on a debugging journey that both involved bypassing the LLM and was appropriate for HN (vs not dismissing the article), so you might want to do that.
dummydummy1234•28m ago
Uhh, that's not the article, the article is running a ml model, on phone and floating point opps for tensor multiplication seems to be off.
_kulang•33m ago
Maybe this is why my damn keyboard predictive text is so gloriously broken
sen•24m ago
Oh it's not just me?

Typing on my iPhone in the last few months (~6 months?) has been absolutely atrocious. I've tried disabling/enabling every combination of keyboard setting I can thinkj of, but the predictive text just randomly breaks or it just gives up and stops correcting anything at all.

tehwebguy•29m ago
Here’s one that kills me:

- Tightening some bolts, listening to something via airpods

- Spec tells me torque in Nm

- Torque wrench is in ft lbs

- “Hey Siri, what’s X newton meters in foot pounds?”

- “Here’s some fucking website: ”

refulgentis•27m ago
.
bri3d•18m ago
Can you read the article a little more closely?

> - MiniMax can't fit on an iPhone.

They asked MiniMax on their computer to make an iPhone app that didn't work.

It didn't work using the Apple Intelligence API. So then:

* They asked Minimax to use MLX instead. It didn't work.

* They Googled and found a thread where Apple Intelligence also didn't work for other people, but only sometimes.

* They HAND WROTE the MLX code. It didn't work. They isolated the step where the results diverged.

> Better to dig in a bit more.

The author already did 100% of the digging and then some.

Look, I am usually an AI rage-enthusiast. But in this case the author did every single bit of homework I would expect and more, and still found a bug. They rewrote the test harness code without an LLM. I don't find the results surprising insofar as that I wouldn't expect MAC to converge across platforms, but the fact that Apple's own LLM doesn't work on their hardware and their own is an order of magnitude off is a reasonable bug report, in my book.

refulgentis•16m ago
Emptied out post, thanks for the insight!

Fascinating the claim is Apple Intelligence doesn't work altogether. Quite a scandal.

EDIT: If you wouldn't mind, could you edit out "AI rage enthusiast" you edited in? I understand it was in good humor, as you describe yourself that way as well. However, I don't want to eat downvotes on an empty comment that I immediately edited when you explained it wasn't minimax! People will assume I said something naughty :) I'm not sure it was possible to read rage into my comment.

LoganDark•6m ago
> Fascinating the claim is Apple Intelligence doesn't work altogether. Quite a scandal.

No, the claim is their particular device has a hardware defect that causes MLX not to work (which includes Apple Intelligence).

> EDIT: If you wouldn't mind, could you edit out "AI rage enthusiast" you edited in? I understand it was in good humor, as you describe yourself that way as well. However, I don't want to eat downvotes on an empty comment that I immediately edited when you explained! People will assume I said something naughty :) I'm not sure it was possible to read rage into my comment.

Your comment originally read:

> This is blinkered.

> - MiniMax can't fit on an iPhone.

> - There's no reason to expect models to share OOMs for output.

> - It is likely this is a graceful failure mode for the model being far too large.

> No fan of Apple's NIH syndrome, or it manifested as MLX.

> I'm also no fan of "I told the robot [vibecoded] to hammer a banana into an apple. [do something impossible]. The result is inedible. Let me post to HN with the title 'My thousand dollars of fruits can't be food' [the result I have has ~nothing to do with the fruits]"

> Better to dig in a bit more.

Rather than erase it, and invite exactly the kind of misreading you don't want, you can leave it... honestly, transparently... with your admission in the replies below. And it won't be downvoted as much as when you're trying to manipulate / make requests of others to try to minimize your downvotes. Weird... voting... manipulating... stuff, like that, tends to be frowned upon on HN.

You have more rep than I do, even, so why care so much about downvotes...

If you really want to disown something you consider a terrible mistake, you can email the HN mods to ask for the comment to be dissociated from your account. Then future downvotes won't affect your karma. I did this once.

johngossman•12m ago
Posting some code that reproduces the bug could help not only Apple but you and others.

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