News for hackers. Stuff that matters.

tntn

Re:U.S. Life Expectancy Drops for Third Year in a Row (2018) on Wednesday July 03, 2019 @11:37AM (#20345225)
"Urban–Rural Differences in Suicide in the State of Maryland: The Role of Firearms"

https://ajph.aphapublications.org/doi/pdf/10.2105/AJPH.2017....

> Conclusions. Male firearm use drives the increased rate of suicide in rural areas

Re:U.S. Life Expectancy Drops for Third Year in a Row (2018) on Wednesday July 03, 2019 @11:19AM (#20345007)
Next you're probably going to tell me about French fries, right?
Re:U.S. Life Expectancy Drops for Third Year in a Row (2018) on Wednesday July 03, 2019 @11:17AM (#20344992)
But it doesn't reflect the factual subtitle. The title here says 1918, but the true trend is 1915-1918, which had a bit of a war as well.

> There is no requirement to post the article headline as-is on HN.

There is. From the guidelines:

> Otherwise [i.e. not excessive clickbait] please use the original title, unless it is misleading or linkbait; don't editorialize.

Re:U.S. Life Expectancy Drops for Third Year in a Row (2018) on Wednesday July 03, 2019 @11:07AM (#20344879)
HN title is not good. Original title is "U.S. Life Expectancy Drops for Third Year in a Row, Reflecting Rising Drug Overdoses, Suicides."

The comparison is between the last three years and 1915-1918, but the Spanish flu was just getting going in 1918.

EDIT: folks just arriving, the HN title has changed since I commented. It previously said "worst trend since Spanish flu," or something.

Re:Writing a small ray tracer in Rust and Zig on Tuesday July 02, 2019 @01:47AM (#20332468)
> I wrapped my objects in atomic reference counters, and wrapped my pixel buffer in a mutex

Rust people, is there a way to tell the compiler that each thread gets its own elements? Do you really have to either (unnecessarily) add a lock or reach for unsafe?

Re:How and why CPUs do “branch prediction” (2017) on Tuesday July 02, 2019 @01:08AM (#20332297)
AMD switched to TAGE for Zen 2, so I don't know if neural networks are "the future of branch prediction" or just a neat diversion.
Re:Reset C by GE Light Bulbs [video] on Saturday June 29, 2019 @04:04PM (#20314485)
what is the point of linking to submissions with no discussion.
EDIT: I'm too old for this. Think what you want about mmap and ioctl.
Re:Apple buys autonomous driving company Drive.ai on Wednesday June 26, 2019 @11:43AM (#20286065)
The copy on https://comma.ai/ has certainly changed tone from what it once was.

Now it is clearing pushing a driver-assist angle ("improves your stock ACC and LKAS," "copilot," "augment"). No mention of "self-driving," "autonomous," or the like.

Previously, it was clearly marketing a full-self-driving, no human involved system: "ghostriding for the masses," "software to make your car self driving."

Re:Google CTF 2019 on Monday June 24, 2019 @11:55PM (#20271052)
Re:Google CTF 2019 on Monday June 24, 2019 @03:15PM (#20267326)
It produces the full domain name (up to .com) in ~ 1 minute. If there is more to the url (a path, ?= parameters, etc) after the domain name, then no.
Re:Google CTF 2019 on Monday June 24, 2019 @12:06PM (#20264971)
Yeah, I put labels corresponding to the original IP throughout and used a jump table.
Re:Google CTF 2019 on Sunday June 23, 2019 @11:39PM (#20260321)
> My other option was to translate it into real assembly

I wrote a compiler from emoji-code to amd64 (mostly because I'm more interested in compilers than reversing). It runs quite fast - prints the whole domain in ~1 min. I'd highly recommend it to people who are into assembly, it was a fun exercise.

Re:Differentiation for Hackers on Saturday June 22, 2019 @04:27PM (#20251559)
Huh, interesting. First time I read this comment, it said something like "why should I care what you think?" I guess the edit indicates that you do care?
Re:Differentiation for Hackers on Saturday June 22, 2019 @04:21PM (#20251535)

    >>> import autograd.numpy as np
    >>> from autograd import grad
    >>> def fn(x):
    ...   return np.power(np.power(x, 3), 1/3)
    ...
    >>> gradfn = grad(fn)
    >>> gradfn(0.0)
    /usr/local/lib/python3.6/dist-packages/autograd/numpy/numpy_vjps.py:59:RuntimeWarning: divide by zero encountered in double_scalars
    lambda ans, x, y : unbroadcast_f(x, lambda g: g * y * x ** anp.where(y, y - 1, 1.)),
    /usr/local/lib/python3.6/dist-packages/autograd/numpy/numpy_vjps.py:59: RuntimeWarning: invalid value encountered in double_scalars
     lambda ans, x, y : unbroadcast_f(x, lambda g: g * y * x ** anp.where(y, y - 1, 1.)),
    nan
… Damn.

    >>> import torch
    >>> x = torch.tensor(0.0, requires_grad=True)
    >>> y = ((x**3) ** (1/3))
    >>> y.backward()
    >>> x.grad
    tensor(nan)
… Damn.
Re:Differentiation for Hackers on Saturday June 22, 2019 @04:02PM (#20251449)
> I don't see a problem with simplifying the exponents first.

Sure, we call that computer algebra. As soon as you start doing that, you aren't doing automatic differentiation, you are doing (at least in part) symbolic differentiation.

Re:Differentiation for Hackers on Saturday June 22, 2019 @01:24PM (#20250670)
Just because automatic differentiation is a different technique than numerical differentiation doesn't mean it isn't a numerical method.

(I probably should not say this, but I will anyway: your comments regarding math and science always give me the distinct impression that you know the name of a lot of things without knowing much about the thing. You are frequently breathless about analog quantum computing, Lie algebras, Chu spaces, some universal concept of duality, but then you fail to respond with substantial arguments to people that try to temper the breathlessness. If you want to convince people of things, you should work on this.)

I don't think anyone at Intel has been patting themselves on the back for their 10nm failure. This wasn't their plan - cannon lake was supposed to be released in 2016, but now they'll maybe have volume production by the end of this year.
a lot of people are using JavaScript without understanding the method signatures of commonly using methods because JavaScript is such a weird and confusing language that has nonstandard method signatures for standard functions.
It is extremely awesome that JavaScript has conditioned a ton of the world's programmers to think that needing to compose your function with the identity function to achieve the desired result is not surprising or bad.

I will not be convinced that an implementation of map that gives different results when there are identity functions in the middle is doing the right thing.

> not even knowing how JavaScript implements map in a nonstandard way that breaks simple examples

FTFY.

I know exactly how map works: https://en.m.wikipedia.org/wiki/Map_(higher-order_function)

This is map:

> a higher-order function that applies a given function to each element of a functor, e.g. a list, returning a list of results in the same order.

Since that is not what Array.prototype.map does, it is not map, it is some similar thing that is misnamed as map. If I wanted the index and the array as arguments, I would ask for them.

What is the syntactic sugar here? I mostly see a map that doesn't behave how anyone would expect.
Re:Linode GPU Instances on Thursday June 20, 2019 @12:08AM (#20229781)
> This is the first time (TMK) that a cloud provider is bringing RT cores into the market.

Your knowledge is incomplete. T4 has been available in google cloud for many months.

Re:The C standard library function atexit is broken on Wednesday June 19, 2019 @08:56PM (#20228833)
How would i.e. OpenGL IHV drivers work as static libraries? No driver updates without a recompile? No driver switches (between vendors) without a recompile?
1. The code you pull in will not get updated unless you do it explicitly.

2. The code you pull in will not get exploited when someone masquerades as the package owner. (How many widely publicized cases of this have there been by now, 5? 10?)

3. Presumably you read the code enough while copy-pasting to be sure it isn't mining Bitcoin or something.

Why are you comparing the size of application dependencies to the size of an IDE that includes several compiler toolchains and tons of other build-only stuff?
I'm somewhat surprised that story wasn't investigated as securities fraud. I'm sure a lot of people stood to make a lot of money shorting supermicro. Anyone who knows more about this than me know why it is ok for Bloomberg to do that?

See https://en.m.wikipedia.org/wiki/Emulex_hoax for an example of fabricated news causing massive changes to stock price.

I think it more just ended than failed.

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