skysight-inc/HackerNews huggingface dataset:
Can someone weigh in on the relatively large difference in prices between various exchanges. I have always mentally chalked it up to friction--caused by the fees of converting from fiat to bitcoin--eating up all the edge in the arb. Is that all it is?

[1] https://www.cryptocompare.com/coins/btc/markets/USD
I use fastmail, and it's pretty fast. I too have wondered what was under the hood, but I figured it out a while ago [1]. The docs are pretty old, and it could use better examples, but its a solid library. If you look at the code, it won't take long to figure out how everything works. They also open sourced JMAP[2] which is the synchronization protocol they use.

[1] https://blog.fastmail.com/2014/12/20/open-sourcing-overturej...

[2] http://jmap.io/
What I don't get from the arbitrage side is why is the spread so much between exchanges? Surely if there is a $500 difference between two exchanges it makes sense to build up volume in both and simply move between them as the price fluctuates? Are the fees and transaction times really so onerous that $500+ differences are washed out in the process?
I don't know nearly enough to comment on the article but at this point I started to think Bitcoin is an abomination that will ultimately hurt everyone - not just the people who invested in it. I think Bitcoin is an abomination because after 9 years of idealistic search for meaningful use case it is almost evident there is none. Instead, Bitcoin becomes this no-face monster swallowing more and more speculative investments. "If something cannot go on forever, it will stop". Bitcoin investors know this and they all hope they will be the ones to withdraw before the bubble bursts and that their gains will be paid by the misfortune of those who are not as "smart" as them.

If pyramid scheme is all we want from cryptocurrencies, we could have done it without the invention of the blockchain.
An Ideal Startup Team Excels at Whole-Brain Thinking
What do the people that use cloud instances that don't have local disks do? You definitely don't want swap to be on EBS...
> if you could take a short position against the coin

How can you short it? CBOE futures only exist for one exchange. What if that exchange’s price stays steady while others crash? Or that exchange goes up while others crash, thereby triggering margin calls while you lose money? Sure, the situation will eventually rectify itself. In the short term, however, you’re broke.
SysAdvent: Threat intelligence: Sharing is caring
The very worst thing you can do with any adversary is to underestimate them.
> but why would anyone buy frozen blueberries.

Smoothies.
I just want to give a bit more intuition on the L_p norms, basically a measure of length of a vector. A norm then induces a distance: the distance between a and b is the length of (a-b).

We assume that for one dimension, we can tell the length: length of d is just |d|, the absolute value of d. But what if we have many dimensions i=1..N?

Then we can use this L_p norm, and the idea is basically just that we set the norm to

[ sum_i=1..N |d_i|^p ] ^(1/p)

Now, what does that give us? Note a few things:

* when all of the d_i are zero except for one, we get back just the value that's not zero (in absolute value), because we go to the p-th power and then back. So, we recover the intuition (and number) from the one-dimensional case.

* for p=1, we just add all the absolute values of the d_i. That just gives us the citiblock/Manhattan norm.

L1 norm of [3, 4] = 7.

L1 norm of [100, 1, 1] = 102.

* for p=2, we square all values, add, and take the square root. This, by repeated application of Phytagoras, gives us the usual "Euclidean" distance in space: if you're 3 m west and 4 m north, then you're 5 = sqrt(9+16) m away.

L2 norm of [3, 4] = 5.
L2 norm of [100, 1, 1] = 100.00999

* now, think about what happens if d_1, say, is very big, and all the others are tiny. If we add them (L_1), we just get the sum, a bit bigger than d_1. If we add the squares, and then take the square root, we'll be even closer to d_1, because the square of d_1 is going to be very big, and the other squares really small, and then we add and take the square root to basically get back d_1. See example.

* Now imagine p=4, or 100. We take a huge power of all d_i, then add, then "invert" the power. All the terms in the sum are going to be dwarfed, except the biggest one!

L4 norm of [3, 4] = 4.284572295

L4 norm of [100, 1, 1] = 100.0000005

* Thus, the infinity norm goes towards the maximum of the d_i. And that's what it's defined as: max_i=1..N |d_i|

* So, big p tend to exaggerate the differences between the d_i, and only the biggest counts. Conversely, small p tend to make the d_i more similar, until it only really matters whether a d_i is 0 or not. In other words, you just count how many are not zero. And that motivates the L0 norm.

Now, think about the unit circle in 2D.

Here some ASCII art:

L0:

|
-+-
|

L1:

/\
/ \
\ /
\/

L2:

-
/ \
( )
\ _ /

Ok, that's my best ASCII rendering of a circle...

L_infty:

___
| |
|___|

You see that the 4 points up/down and left/right are fixed (-1, 0), (0, 1), (1, 0), (0, -1), because of this property that if all are zero except one we fall back to the normal distance. But then, for others, the points we consider close enough to be within the unit circle "bulge out" as we increase p.
SysAdvent: Investigating performance problems through snapshot logging
That's a fair point, Troy. Thanks for the feedback!
Ask HN: Which are the best conferences or summits on ML and AI
I have recently started taking interest in Machine Learning, Deep Learning and AI. I would like to attend good ML and AI conferences in Europe. Any recommendations?
That's interesting. The sheer operations still require interpolation (just that, you don't need to do 2D interpolation, 1D works out), so you still need to interpolate.

And the scaling also requires interpolation. So I'm not sure if it's better or worse in terms of bluriness.
How to Be Awesome Every Hour of the Day
> No escaping it.

Except, perhaps, with our own hands. Web f.e. techs being fractured, redundant, incomplete, endlessly changed and bloated as they are is obviously extremely suboptimal. Better alternatives can easily exist. It's a disruption question. If the superior solution can survive through every obstacle it will face which tries to prevent people from hearing about its superiority and actually trying it, it will supplant the existing one.
Twitter is a cesspool.
Hacker News crowd might be interested to hear that Saab lives on as "NEVS" under Chinese ownership and management and will launch as electrical vehicle.

http://www.thedrive.com/sheetmetal/16729/swedens-nevs-has-re...
Not going to happen. Too much benefit for monitoring and management of the systems and not enough downsides.

Security education and practices need to be taken more seriously by executives.
Oh man... I had totally forgotten that sound until you mentioned it.
"EUV in mass production" is something akin to commercial fusion power. Every few years, a big fab comes forward and says that they will get EUV in production in yet another few years.

Except this time, there is a genuine need for it. There is only that much free area they can get by squeezing cell sizes.

After compact SRAMs (there are a few 4T and 3d SRAM designs that fabs will be introducing next year to compensate for missed node shrink https://www.eetimes.com/document.asp?doc_id=1332734), they will not have many things left to shrink.

EUV was thought to be a way to avoid multipatterning at 65/45 transition, but now we will have to do quad patterning with both 10nm and with EUV at 7nm, and this makes the main reason for EUV use (avoiding multipatterning) not that all important.
Thanks. Good to know. Seems closed source (nothing wrong there, just fyi for others)
> A train from Washington to New York will set you back $1.14 per mile, with less flexibility.

The trip is approximately 226 miles. With sufficient advance purchase, the Northeast Regional coach fare is $49 each way and the Acela is $168 each way. I have never seen an NER fare greater than $200 each way. How did you arrive at $1.14 per mile at all, let alone thinking it's typical?
i agree with this , lack of swap makes oom too aggressive . , question what's worst no app (and react to OOM) or app swapping
I have Samsung 4k 40" curved TV as a monitor. It has 600px extra vertical, it's overwhelming initially :)

Screen area must be managed as Matt says. With 2 monitors the all important center area can't be used for display, so the neck works overtime.

Never going back to multiple monitors, they are basically a hack.
You can’t legally walk away from dollars in the us.
"saved time" at the least optional time to save time. ORM's are a maintenance burden. They obfuscate DB performance behind usually an enormous API surface.

Most software work is maintenance work. Optimizing for initial deployment is shortsighted.
It's just that you reduced it to "rotation matrices". And that's not what the trick is. The trick is factoring the rotation matrix into some easier matrices.
This seems like the development of an artificial chemical intuition[0][1] except since its a computer it can intuit concrete numbers much more comfortably than humans can. I do wonder how its accuracy compares to just running the DFT calculations.

[0]wavefunction.fieldofscience.com/2016/09/what-is-chemical-intuition.html

[1]https://news.ycombinator.com/item?id=12624036
I really liked this comparison. You might be right!

Can you say more? For example:

1. Back in the day, in the US, easy pre-made home meals were the rage. Frozen meals. Microwave dinners. Meals from a can. I don’t mean, “yeah, sure, we still have those today.” I mean, “This is the new society, this is the future, and this food is delicious and amazing!!!”

Was that ever a trend in China?

2. Is there a “Blue Apron China?” I don’t use Blue Apron, and personally think it’s silly — just wondering if there is something similar in China.
Human body heat mining, very Matrix esq

https://thenextweb.com/cryptocurrency/2017/12/12/startup-use...
I don't think there's a funniest submission competition, but I marked it as a favorite.
I'm very happy to live in Zurich where most people ride trams, bike, or walk. To me a good city should feel like a place to mingle, not zoom around in personal capsules.

(No, it's not exclusive to rich countries. Before Zurich I lived in Moscow and used public transit daily for two decades. Loved it too.)
I think the FDA will fight to your death for your right to safe medicine.
Sorry for the confusion in my response. I didn’t mean to imply that.

Rural telcos had access to this money for sure.

Municipal government really benefited as well — for its own purposes, not municipal broadband.
> Or frozen blueberries, but why would anyone buy frozen blueberries.

Because they are available and inexpensive year-round, and they defrost well and are good in many applications. Outside of the peak of local season, its the best way to buy blueberries.
Ask HN: What do you look for in resumes when recruiting?
I want to do a quick holiday side project and thought I'd make a online resume builder.(Yes, I know there are thousands already, but I want to build one that's slightly different, and won't harass you for your email before giving you your resume.)

What I want to know is what do you, person responsible for sifting through these things, want to see when going through resumes?

What format, how much information, what information... Things like that? What pisses you off about a resume, what makes you appreciate it?

I basically want to make a kickass resume-making service that both applicants and hiring managers would appreciate. There's more secret sauce to my idea, of course, but I want to focus on the resumes first and foremost.
Those are more of a query framework than an ORM. If that's your bar then most ORMs are going to fail to meet it.
"At its launch on Saturday, Nio introduced a battery charging plan with a rental subscription set at 128,000 yuan ($19,366) a month."

Oops! It looks like the press release with the decimal in the correct place is here: http://www.digitaljournal.com/pr/3598606 at a more reasonable $194.
To be honest, I think this approach to working with emojis is very flawed. It seems to be most obvious on Slack, where multi-component emojis are regularly split into separate characters.

Case in point:

{"emoji": "‍‍‍", "name": "family_mothers_two_girls", "shortname": "", "unicode": "", "html": "&#128105;&zwj;&#128105;&zwj;&#128103;&zwj;&#128103;", "category": "p", "order": ""},

This should really not be `family_mothers_two_girls`, nor should it be "Family: Woman, Woman, Girl, Girl" as Emojipedia describes it (https://emojipedia.org/family-woman-woman-girl-girl/). It should be (and is, in the underlying unicode) `woman,woman,girl,girl` - the zero width joiners being represented as commas.

On Slack, when I post the "Man Singer, Medium-Light Skin Tone" (https://emojipedia.org/male-singer-type-3/) emoji, it splits it up into a man with medium-light skin tone, followed by a microphone. This is because it has replaced my emoji with:

:man::skin-tone-3:‍:microphone:

What Slack should be doing is storing my emoji as:

:man,skin-tone-3,microphone:

This differentiates between zero-width-joined emojis, and multiple separate emojis. Currently there is no difference, and there is ambiguity about what my intent was - currently it just has to guess about which might want to be joined.

Of course this also means that Slack doesn't just work with new emojis or newly combined emojis - they all have to be added and supported manually. That defeats the entire point of the emoji standard! Instead of storing labelled versions of the emojis, why not just consider storing the actual unicode code points...?
Also the most recommended pressure cooker on reddit:

https://redditfavorites.com/products/slow_cookers

When I made that site I remember finding it surprising that it was the top slow cooker and rice cooker.
> how will watching this flick affect what the recommendation algorithm thinks of me

Not to mention the fact that my wife and I use a single Netflix account. She watches things that I think are objectively garbage. I watch things she feels the same about. There are several things we enjoy watching together.

Just show me what you've added in the last month and make it easy for me to browse categories. That's all I want.

And how long is Kevin Hart's 3-year old stand up special going to be in the "recently added" section? It's been there for me for at least 8-9 months.
Excellent. I'd been wanting to implement something like this but these guys beat me to the punch.

Most existing research on NNs in chemistry uses the SMILES string representation and feeds it into a recurrent neural network. The problem with SMILES in my opinion, is that SMILES is not unique, and there are a gazillion ways to represent the same molecule. Thus, the RNN is probably overfitting to the quirks of the SMILES serialization algorithm used by the US Patent Office and/or ChemDraw and/or whatever program was used to generate the library of molecules.

Convolutional graph networks are the obviously correct way to handle molecules.
In what regard is that car a "Saab"? Same factory? Same IP? Certainly doesn't look like same designer.
But the compression in GIF is so terrible that it will possibly be way bigger than individual JPEG or WEBP.
I would say, go with WEBM and a mobile frame-by-frame player, there are dozens.
The answer is that our insurance and medical billing system is a complete tirefire and needs to be burned to the ground and replaced with something sane.
Pet peeve: it’s voilà (a French word), not wallah.
At that point, why not use cash? You’re already restricting yourself to small amounts and avoiding major purchases, so what does adding a cryptocurrency give you?
Kubernetes forces you to start it with flag to tell it "I know what I'm doing, I know this machine has swap, but start Kubernetes anyways even though it's normally a bad idea to run Kubernetes on a machine with swap".
The article specifically lists reasons why you should enable swap when there is plenty of RAM. Can you elaborate on what part of the article's reasoning you disagree with?
I think fabs are a business where capital rules vs labor cost. GlobalFoundies built a fab in New York, but got megabucks in aid to do so.
Intel has tons of money, and their core business is still a giant cash cow.
What a horrible article. It doesn't have something as basic as the car's range and it gets the monthly battery subscription cost wrong. But the worst part is it just repeats "Tesla" as many times as possible. Tesla is a tiny part of the Chinese EV market, see [1] for recent monthly sales breakdown.

There is plenty of interesting stuff happening in the market and this company's battery swapping could be interesting. This article managed to miss all that.

[1] https://cleantechnica.com/2017/09/30/china-electric-car-sale...
I'm baffled by the snark. Could someone please attempt to reconcile the following positions for me:

1. We need regulation of drugs/medicine/etc because we do not want some snake oil peddlers peddling arsenic as medicine?

2. Regulations prevent us from getting shit cheap! Baaaaa!
I was aware before my first comment, but I replied like that because skew and stretch "trick" was common knowledge in my school. But thanks anyway.
People do but there’s an entire industry devoted to lobbying against competition.
Yay for new and shiny I guess. Thanks!
You're probably right. As I mentioned elsewhere, I feel bad about any downsides this has for women. It's probably a downside that we should try to mitigate.
I think a big problem here is that people are discussing points like manufacturers should be blamed / fined, or that the owners of the devices should be responsible etc, but no one is addressing what seems to be the real issue that most owners of these devices don't understand them enough to actually know these issues potentially exist.

In your analogy I would say its not that people are leaving these weapons cabinets on the street unlocked, but don't know that its possible to lock or hide them.

Another good example would be cars, if you went to the showroom and someone showed you a two cars, one with no locks on the door that was easy to start without the keys, and one that had proper security the choice would be easy and you could understand what you're seeing.

If you go to a shop and someone shows you two IOT devices that do the same thing, and look identical, you cant really see anything that helps you learn about the security features, and as an average person if you're told one has certain "tech speak" security words you don't understand are you really going to make the choice to spend more money to protect against something you don't fully understand, that you don't see any effect from?

Yes manufacturers should be made to release products that are secure and respond to security issues in a timely manner, but we also need to educate people that computers aren't some magical box beyond their understanding, blaming owners in these cases would I think make the issue worse.

If you consider that the majority of people who have the internet get their ISP to set up their router, and only have a basic understanding of what that device does, how can we expect people to understand what the potential issues of open ports or vulnerable firmware are? And then could these people even be educated to the level we would need for them to be responsible for securing their own devices?
Game Sound Effects Designer Phil Michalski's Xmas Bundle: 100 Royalty-Free Files
> Case in point - G.R.R. Martin uses a DOS machine to write

George RR Martin used a DOS machine to write. I'm pretty sure GRRM does not actually write anymore.
OOM is tunable.
Exchange A price is $1000

Exchange B price is $1250

Makes sense to buy on A and sell on B for a nice profit. So I buy 3 coins on A and send them to Be, sell on B and have a nice $750 profit. Now you need to get fiat from B to A and this is where you hit your bottleneck.
I remember seeing a really old pneumatic remote for a TV a long time ago.

It was basically a rubber squeeze pump (just like on a blood pressure machine) and a rubber tube connected to the tv. When you squeezed the pump, the pressure in the tube would click the dial forward one notch.
Yes. ulimit and cgroups do wonders.
FDA is given power to do a necessary job: keep us from eating poison instead of medicine, or whatever. But the same power is abused to prevent competition by "suggestion" of the industry that provides these medicines.

It's hardly a complicated situation.
Nope. It's actually against the law. There are some in congress that have been fighting for years to allow US citizens to personally import from Canada. There used to even some be surreptitious "tourism" along the border for day trips to Canada get prescriptions filled, but they put a stop to that shortly after the ACA passed.
I suggest an experiment. Find someone with a trait you admire and lack, try as hard as you can to be like them. Check your results.
That's the same for every asset ever.
My Free-To-Play Gaming Postmortem
I wondered this for a while, unfortunately a major question I have remains unanswered in the text: What about SSDs and SSD-only systems? (Like... any average laptop.) Should I be worried that putting a swap on an SSD will cause it to wear out fast due to many write cycles?
Gnome's Mutter Now Supports XWayland Keyboard Grabbing, XDG-Output – Phoronix
Disk is still way cheaper than RAM, and I always add some swap space to my servers just to lessen the chance of getting ENOMEM errors if/when an unexpected or unusual workload would come along.
Lol. From the newyorker article “I’m sure there’s somebody in India who could sharpen your pencil for $8, but if you want authentic American craftsmanship … that’s how much quality costs these days.” https://www.newyorker.com/books/page-turner/pencils-and-noth...
Holiday travel chaos ahead after Atlanta airport outage
Again, you're preseenting assumptions. We don't know that things will still work that way if people lived radically longer. You certainly don't know that well enough to shun people who try to find out.
Douglas Coupland book, no?
I think the best part of the instant pot is how affordable it is. My mom had a pressure cooker for about 10 years now. It finally broke and we saw these huge sales during black Friday so we couldn't resist. It's crazy how useful these things are. We use it for soup, congee, and yogurt on top of the standard pressure cooking functions! Making your own yogurt is great because you can change the consistency and taste to your liking! You save a couple bucks too. We prefer the stainless pot rather than the non-stick pots that most pressure cooker have.
My First Application with the Phoenix Framework – Talktotalk.me
Free market man isn't out to save people, he's out to adjust the market to be most profitable. Suffering is more profitable than not-suffering.
The Recursive Women in Tech Issue
I agree. Being pleasant is probably a mix of having a good dose of the agreeableness and extroversion personality traits. Both of which are uncorrelated to creativity and IQ, other two traits.
This is due to memory overcommit, it's a performance feature. You can turn it off.
Anatomy of a Bad Idea
From the article:

"According to a Georgia Power statement, the utility believes a piece of equipment in an underground electrical facility may have failed, causing the fire. The fire was next to equipment for a backup system, causing that to also fail."

Murphy's Law in action?
With a few exceptions its not legal to bring foreign drugs or re-import drugs (made here and sent overseas and brought back) into the USA.
Exactly: it is a very simple situation - we collectively as the society decided that we do not want garbage peddled as medicine. FDA established how we determine "not garbage". Full stop.
I think you could even mine Bitcoin with Turing-complete cellular automata simulated by a crowd of trained dogs, receiving movement orders by a small internet-of-things bluetooth radio (powered by IOTA?), implanted into their brains.

For what it worth...