skysight-inc/HackerNews huggingface dataset:
I have recently started looking into Nix to solve the problem of dotfile deployment to new OSX workstations. When you get a new laptop, you clone your dotfiles, maybe symlink them to your home directory -- and then what? Nix solves this problem for me by coupling my dotfile deployment with the installation of the related software.

The learning curve has been absolutely tremendous, however. That said, the support on Freenode has been some of the best I've encountered in more than a decade.

https://nixos.org/nix/manual/#chap-package-management
https://rycee.net/posts/2017-07-02-manage-your-home-with-nix...
You're probably supposed to use the contactless "smart" card to board. In many systems this card is linked to your bank account and tops you off at a certain amount each time your balance reaches a certain minimum threshold (e.g. once your balance is $10, it takes out $40 from your bank account).
> In this way, the researchers succeeded in showing the entanglement of 16 million atoms when previous observations had a ceiling of a few thousand.

It is my intended inference to show that all photons are 'entangled' weakly though two individual photons can be entangled 'strongly'
> He is a professor of computer science, not economics or any similar field that you could tie to banks.

Makes you wonder why he wrote a 27 page document full of economic arguments to the SEC and boasted about it the notorious anti-bitcoin subreddit /r/buttcoin.

> I'm interested what agenda you are speaking of.

Stolfi has been a long time critic of bitcoin because he determined it could not scale because it is an inefficient system. I can understand that argument because it is true from a computer science perspective; bitcoin is a broadcast network where every node has to process all transactions made. No issue there. But given that fact, doesn't it seem strange then that he is actively participating (in a positive way) in conversation with the people (bitcoin cash supporters) who want to make the bitcoin system more inefficient (broadcast more "redundant" data) by his own definition?

Further, he has been a vocal critic of technologies that have to potential to fix his main concern with scaling bitcoin, namely the lightning network (which is practically not possible with bitcoin cash). Not to mention his use of derogatory terms like "Blockstream/Core" for the open source project that has massively increased the performance and capabilities (and thus scaling) of bitcoin, and calling privacy improvements to the system "money laundering" techniques.

Another particular thing with Stofli is in how many ways he thinks bitcoin is illegal (which has nothing to do with his scaling argument) as you can listen to in this interview: https://soundcloud.com/bitcoinuncensored/buttcoin-vs-bitcoin...

I could go on and on with these examples. If you are interested you could take a look at his comment history on reddit: https://www.reddit.com/user/jstolfi (all my examples and more are in there).

His actions are very inconsistent with his arguments and I don't think he can be trusted for that reason. Gregory Maxwell, one of the most respected and accomplished bitcoin developers, had this to say about him: "Sometimes you encounter a person whos opposition means that you're doing something right. Jorge Stolfi is one of those people."
It's not, unfortunately. But how are you "keeping the lights on" with your old MS Fortran based code? Still using an ancient Powerstation? compiler, or Compaq Visual Fortran, or ... ?
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Shepherd is not a kernel, Hurd is, and shepherd page mentions a relation, that dmd/shepherd was developped closely to Hurd but it not the same thing.
I found this worthwhile simply for the history of typesetting, regardless of the difficulties of printing mathematics. I did not realize how much went into typesetting and printing back in the day. Hard to believe daily papers were so prevalent back in the 1800s when it was so challenging to print anything at all! I definitely did not give printing enough credit in the pre-digital era. It's amazing!
I think the Intel compiler has a reputation of producing the fastest code, and Intel makes both C++ and Fortran compilers.
Would you just look at the padding and space between those seats. I miss that far more than the plane model.
I believe a native mobile app would be able to make the request and scrap the data, regardless of CORS. Because basically no suspicious information is transmitted, it'd be pretty easy to squeeze past an app store review.

Of course, you could buy one of these services and have access, too.
Having moved to the south, and in an area where the percentage of Trump voters (and current supporters) are the VAST majority, they don't know about this stuff. And if you try to explain what data can be gathered they don't really believe you. Let alone saying what can be done, or the damages of that data being hacked. Though this Equifax thing has been helping me convey the importance to them.

tldr: They aren't aware. They aren't techies.

P.S. We're in a two party system. Just because you agree with some policies doesn't mean you agree with all policies.
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Uber switched from Postgres to MySql. https://eng.uber.com/mysql-migration/

If I remember right, though, mostly because their use pattern was more like a key value store, and MySQL worked better for that pattern.
For my follow Americans thinking about commenting on this, keep in mind that mortgages vary quite a lot from country to country.

The mortgage system we have in the United States--characterized by: domination by the government (in the form of GSEs), long (30 year) fixed rate mortgages with no prepayment penalties, high leverage ratios (up to 19:1 or higher), and low spreads--is not the system used elsewhere. Other countries also tax mortgages and homes differently, and may have far more widespread rent regulations in place.

Rules of thumb and folksy wisdom that was developed in the context of the US system probably won't translate well to a very different one.
That seems like a bit of a false dichotomy. Do the Postgres Devs genuinely see having a bug tracker as a "bad thing"? Or are they just stuck in their ways at this point?

A mailing list hardly seems like an efficient method for tracking bugs unless a major part of the efficiency is reducing signal to noise by make it more difficult for non-developer or non-paying users to file bugs
For my practical reasons I can not use pure GNU distributions, I am not aware of easy community way to re use packages for other distro or something hacky like that. Not everyone have brainpower and time to build custom packages for rare distro, it is a shame, I really like Guix.
NixOS got some recepies for using not 100% libre software.
If someone is critical of arbitrary elevation of black and latino people above white people, are they racist?

If someone is critical of arbitrary elevation of women above men, are they racist?

If someone is critical of unrestricted immigration, are they xenophobic?

If someone is critical of violent political expression steeped in Islamic ideology, are they Islamophobic?

---

Let me be clear, I am by no means advocating that one particular race is superior over another and I wholeheartedly reject discrimination and prejudice based on race or ethnicity.

Furthermore, I am all for protecting women from sexual violence and ensuring women have the right to vote, right to hold public office, right have equal rights in family law, and so many other rights and freedoms that women (and men!) have fought for.

Additionally, I am all for legal immigration where (for example) high-value applicants are expedited.

And finally, I have absolutely no dislike or fear of Islamic cultures and peoples, nor do I regard Islam as a dangerous political force.
Python solves this problem with "virtualenv", where the user creates a virtual environment and installs all programs and libraries into that environment. The user can have multiple virtual environments, and it is easy to switch between environments.
Especially if they can get the operator to purchase / maintain the bus!
My theory is that right wing voters do not really care about policy. They seem to respond more the displays of strength.
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Was Postgres always this way? Was the code from Berkeley abnormally stable/robust for commercial software (and extremely abnormally stable/robust for academic software), or was there an effort to clean it up to get to high quality?
I find that this sort of eco-doomsaying much less constructive than the impressionable young men with inflated dreams.

Regardless of how innefecient it is to feed positive change through impossible dreams, insisting on idea that humans are self-destructive species that will destroy themselves and what's around them is borderline neurotic and ignores the continuum-nature of evolution of Earth.

Humans have been terraforming the planet since life has appeared on here.
Nope, that's not how prices are set.

https://www.quora.com/How-does-a-land-value-tax-not-create-d...
Are you sure mysql doesn't enforce foreign key constraints? I recently did a project with mysql backend and it did threw constraint errors on invalid inputs that didn't match a parent key record.
I call myself a developer but I often work on stuff where at the start we don't know whether it will be desktop, web, mobile or whatever. We don't know which database will be best so we try a few. I guess it's research but it feeds straight into development which is done by the same people within the same project.
This doesn't mean anything. Although many more die from automobile crashes doesn't make using public transportation in some major cities inherently dangerous or unpleasant - even unhealthy.
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The cities included in the study are Boston, Chicago, Los Angeles, New York, San Francisco/Bay Area, Seattle, and Washington, D.C.

I haven't really spent huge amounts of time in a couple of these cities, but I wonder how uniformly over the cities the data factored into the decision. My impression is that NYC, Chicago, and DC have much more comprehensive public transit systems than do the others in the list (except Boston, about which I know next to nothing.)

Is my impression just wrong? Public Transit just didn't seem to be nearly as big a thing in LA, SF, or Seattle in the time I spent there.
Yes, but that doesn't actually prove anything about the safety aspects of switching from public transit to a taxi-like service. The comparison would have to be made like-for-like trips.

However, the risks for both are quite small, and that's why the quite big gap in convenience dominates the equation, anyway.
Yes and it says "First-class meal service on a Pan Am 747 in the mid-70s" :)
But was it more accurate? Was it for the same purpose? Getting within a few percent of a CFD model might be good enough for industrial use. For studying systems (from the perspective of scientific investigation) it's not even close.
I hear cloning is a thing ;-)
Of course the they can, but that's not the thing here and it's about JS. The "lock" here is the event loop, and that's the issue.

I don't understand the part where the database is doing work is in any way related to what the JS app is doing. Even if you are running on the same machine, they are bound to have different runtime scopes and not related on how they execute.
I hope urban planning committees use this as a wake up call to step it up and improve non-car transportation options.

Rather than banning Uber/Lyft because consumers prefer them, cities should beat the competition by making public transit really good.
If they rent it they pay income tax anyway (or rather the company that owns the place does). The "virtual rent" added to income is for people who own the place where they live.

Switzerland is not very home ownership friendly, at least there are very little tax incentives for it (personally I'd rather have people invest their wealth into productive things rather than real estate, so I find it good).
In large cities most places are owned by banks/insurances/other real estate companies and rented out.
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You're partially correct. It does when inserting or updating, but if you do an alter ignore table you can create foreign key constraints that are actually invalid.

So... not in all cases
Most likely reason is to avoid drivers being robbed - if there's no (easy and accessible for the driver) way to take money out of the thing, local addicts won't get an idea "let's jump on a bus and take money from the driver" because driver can't really give the money.

Also a bit of avoiding fraud from driver's side - if the driver is allowed to take money out, it's impossible to control whether all the payments actually got to the end point.

That said, I've seen systems where the drivers give change - e.g. in Israel - and that's wasn't a big deal. So I guess it also depends on the locality.
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It may increase the "total miles traveled" but doesn't it also increase occupancy density in the cars, thus reducing the fuel/pollution consumption?

I'm tired of shitty data coming out of Uber and Lyft: I want to know about fuel consumption and the impact on auto insurance rates/accident frequency.

Given the known population of drivers, what is their average insurance rate, fuel consumption etc vs the general pop whom are driving their own cars/fuel/insurance?

I recall I had a heavy month on city car share where I spent $800 in one month for that service. Fuck that. I cancelled my account after that.

There is extraordinarily valuable data these companies (and insurance companies) have they don't share. The fact that they hoard this data to protect their profits should be criminal as this data should be a Utility...
When the subsidies end, will people be willing to pay $10 +1 for the exact same ride vs public transit?
I wasn't talking specifically about the PowerPC architecture, I was just pointing out that just because a computer supports 'W^X' doesn't mean you can always know exactly what instructions a program will run. You need stronger guarantees then that (Like, for example, that you can't run unaligned instructions, and that all instructions are the same length). You could never really write a recompiler like this for x86 code even though you can mark data with the NX bit, because you can't tell where the instructions start, or whether or not a jump may end-up half-way between an instruction.

That said, when I wrote that comment I didn't know for sure if the XBox 360 CPU had that or not. Looking it up, it's still not 100% clear to me but I would wager no. There are extensions to the PowerPC architecture that have shorter instructions (It appears to be somewhat similar to Thumb), but I was unable to tell whether or not the XBox 360's Xenon supported that. Being that clearly people more familiar with the XBox 360 then I am believe compiling the code beforehand is possible, I think it's likely the XBox 360 doesn't have the optional support for variable-length instructions.

Still, there are some RISCs that have variable length instructions [0], but as you'd expect the majority of them are fixed length (Though, especially in this context RISC vs. CISC can be pretty arbitrary). Even just talking about Game Systems not all of them run RISCs. The 6502, z80, and 68k are all classified as CISC and have variable-length instructions sets, and all of those are featured in lots of Game Systems. So it is a problem you have to consider if you're going to be writing a JIT/recompiler/etc. for those architectures.

[0] https://en.wikipedia.org/wiki/Comparison_of_instruction_set_...
One problem I've noticed is that Uber/Lyft drivers like to use bus stops to pick off or drop off passengers, which obviously slows down buses quite a bit. I wish buses had cameras that could be used to automatically fine those drivers...
I can vouch for the immense improvement Nix has made to my software development process. I use NixOS on my desktop and laptop. At the OS-level, it gets a lot of things right: reproducible, immutable system configs; lightweight containers; devops with declarative configs. At a software project level, nix-shell is an indispensible tool. Compilers and interpreters aren't even part of my system-wide config; instead each project has it's own shell.nix file that installs all dependencies I need on the fly without polluting system state or virtualization. Nix is a god-send, and the developers that contribute to it are nothing short of awesome!

The area that needs improvement is the documentation. Once you learn the Nix language, reading the source code is pretty helpful, but it would be nice to make it more approachable. For example, the nixpkgs repo has a bunch of Nix helper functions that are useful to developers when writing their own packages, but these functions' documentation is either buried in a long manual, or non-existent.
That’s from 2013... more recently http://metro.co.uk/2017/01/19/is-this-the-end-of-the-roadfor...

https://www.ft.com/content/40774fc6-76b5-11e6-bf48-b372cdb10...
Maybe these are considered "business partners" and not "anyone"? :P
Both are typically filed under R&D on expenses reports and more often than not done by the same people.
The statistics don’t really tell that story.

Getting mugged in a station doesn’t typically kill you, and you’re not travelling, so those stats won’t be counted.

If there was an “incidents per mile travelled”, metric for my trip during daylight hours that would be one thing. But there isn’t any such statistic.

It’s almost certainly cheaper, safer, more time efficient and dramatically more convenient to take a car. In my personal, typical case, I live and work in the same city. Drive/bike/bus/walk time is 10/25/45/90 minutes, respectively. Cost if daily commute assuming IRS costs is about 20% more for driving, but with shorter more predictable and more flexible trips.
That's the whole trick. Good code makes complex stuff look simple. Bad code makes simple stuff look complex.
Up to a point. You can't install the c (etc) compiler in the venv, so you end up with some dependencies on the external system.
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The mainstream of IR research has deliberately avoided the development of a "relatedness classifier" in the sense of a system that produces a probability score that a document is relevant. The TREC organizers have been mostly interested in "get good recall" and less interested in P@1 or rewarding the kid who sticks his hand up really high when it's an easy question and knows the answer.

You can tune up a conventional IR function with these kind of methods

http://scikit-learn.org/stable/modules/calibration.html

with the data that TREC publishes. The results are a little disappointing because the system will probably never predict more than a 70% probability of relevance.

I am interested in the promise of "Siamese networks" for learning relatedness, see

https://www.cs.cmu.edu/~rsalakhu/papers/oneshot1.pdf

for example. For document-document matching I think this approach would be great (and supportive of relevance feedback, something that mainstream IR algorithms have never done that well at) Query-document matching may require something similar but different, since there is an asymmetry between queries (short) and documents (long.)

Click on my HN profile link and we can talk more. Thanks!
What third-world country do you live in that has such unsafe public transport?
Doesn’t innodb atleast enforce those constraints?
How much was the airfare (in inflation adjusted dollars) back then?
On what should happen if the unthinkable happens
Nice to see functional components in SFCs now.

I've been loving vue since I used it for a project that I wanted to ditch react on.
One mile would add 20 minutes in each direction, to a commute that probably already takes two hours per day. Transit planners assume riders will accept walking 1/4-1/2 mile.
It's been shown many times over that this 59% number is terribly miscalculated.
Ask HN: What are some interesting big data blogs for beginners?
Hi there,

Looking for some big data blogs, ideally aimed at beginners - which document entire experiments ie. getting the data/analysing it/making a conclusion.

Any interesting ones?
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I cannot drive. I take Uber to and from work every day using a Uber pass.
If my alternative were public transit, a bus to a train to another bus or train depending, it would take me 1.5 hours per trip, for a total of 3 hours a day.
I would not work in the corporate world if this were the case.
Does this study capture these positive externalities?
For blind people, these often-derided services are the difference between a full life where we can participate, and being marginalized outcasts who are constantly late, smelling like the bus, and totally inconvenienced when compared with the guy who can just hop in his car.
Unfortunately many of these crimes will go unsolved because BART refuses to release videos. Apparently, releasing the videos “could lead to stereotypes”

https://www.google.com/amp/sanfrancisco.cbslocal.com/2017/07...
Caltrain doesn't need to compete with multiple-occupancy vehicles. Most of the people riding it would otherwise be driving solo.

That said, reducing fares might attract more riders -- but whether it would increase revenue overall is more questionable.
Does strategic speaking make any sense when you’ve both read these guides (the answer is no). I don’t think it’s normal to need a guide on how to communicate with people, and I don’t think a guide can help you if you feel like you need one.
> Makes you wonder why he wrote a 27 page document full of economic arguments to the SEC

Because the SEC directly asked him to, as an expert on Bitcoin.

> Further, he has been a vocal critic of technologies that have to potential to fix his main concern with scaling bitcoin, namely the lightning network (which is practically not possible with bitcoin cash).

For scaling he does think big blocks are a less bad idea, and that "sidechains" are hopelessly underspecified. But his objections to the LN are detailed, and really haven't been addressed by proponents. It's questionable both conceptually and in what passes for an implementation (after two years of it being vaporware).

It's entirely unclear how being a "vocal critic" of an idea that's bad on multiple layers is an "agenda".

>and calling privacy improvements to the system "money laundering" techniques.

Uh, that's pretty much what they are in practice. Bitcoin has enough problems as a vehicle for money laundering with full history on the chain; making it less traceable is immediately going to make it more attractive for money laundering.

"privacy improvements" is very nonspecific. Can you link said "privacy improvements" and Stolfi's statement about them?

> His actions are very inconsistent with his arguments and I don't think he can be trusted for that reason.

I have yet to see an inconsistency.

You still haven't set out the "agenda" you claimed, nor evidence for it. Your main objection seems to be that you disagree with him, and that he thinks the LN is bad.

(Emin Gun Sirer is a computer science professor who is similarly disdainful of the LN, can't wait to hear what his "agenda" is)
> Personal convenience isn't the only definition of what makes transportation better.

But this is the only one that would be taken into account by a person when deciding which transportation mode to use. If you don't take it into account, you're making the stats better, but the lives of people worse.