improbable22

12 ms·

61.
by improbable22 7y ago
Not really topology, it's more like group theory, and representations. Ordinary convnets are a way of building in translational symmetry, which is the group R^2 (in the plane). The work being described extends this to larger symmetry g
62.
by improbable22 7y ago
The norm at least in parts of physics is to update the arxiv version once the paper is accepted, with a note saying "v3: matches version to appear in XXX", with a DOI link. Where "matches" means the content, but not the
63.
by improbable22 7y ago
Half the article is about the social observation that making your work unnecessarily complicated is, too often, a way to impress people. Especially those, like funding agencies, who try to judge without understanding it. Many will be impres
64.
by improbable22 7y ago
OK, thanks, that makes some sense. The issue I'd still raise is why we dance in time, several people organised with music, when dancing solo would seem plenty for such a display? That's what lots of animals do. But none of them sy
65.
by improbable22 7y ago
What's the connection with running? Certainly that's another way in which we are unique, and it's the reason we are uniquely hairless too, for cooling. But dancing still seems to me to want a better explanation than just sayi
66.
by improbable22 7y ago
But then why don't chimps dance? Or any other mammals really. I mean it seems clear that fitness display is a part of why we do it, but it can't be the whole reason.
67.
by improbable22 7y ago
> to support social entrainment Possibly. I can't find the write-up of this, but there's a nice idea that this may have another purpose: Dancing as a group might be a way to fool savannah predators that your tribe is one large
68.
by improbable22 7y ago
But now we know there was physics at the bottom of alchemy. Whereas demonology at best leads you to psychiatry, and we still don't have simple models of what works there. Nor much hope of finding them. Thinking is a messy business.
69.
by improbable22 7y ago
tanh(Ax+b) is simple, but the dataset it's supposed to work on is not easily summarised. I think that's the huge difference. The guys doing "sugar molecule" studies make progress by taking much simpler datasets, like ran
70.
by improbable22 7y ago
I think you're asking for the holy grail here. Everyone would love to have such a thing but nobody thinks it's likely to be possible. So they settle for much smaller targets. Either of understanding how much simpler systems work.
71.
by improbable22 7y ago
* Antarctica! Every map you see in Chile & Argentina includes a large pie-slice of the continent... and pretty close to being the same pie slice as each other's. Not to mention some islands which one of them tried to take over, onc
72.
by improbable22 7y ago
But Mathematica, on the other hand...
73.
by improbable22 7y ago
From the comments on that: > No one should use global scope of Julia for calculations: [...] which is said that takes 35 seconds. > If you wrap it in a function and not had a type instability, You'd get 4.704 seconds... Half-dec
74.
by improbable22 7y ago
Sure, but that's an odd reading of GP's "graphical notations like this one". Feynman diagrams are very useful, and made respectable lots of other graphical notations. There's a nice book on this: https://
75.
by improbable22 7y ago
For my amusement mostly, here's the Julia translation: nums = [1,2,3,4,5] nums ↑ 6 # const ↑ = push!; const ⤉ = pushfirst! nums ⤉ 6 nums .+= 2 # addition-assign to add 2 to each item num
76.
by improbable22 7y ago
IIRC almost all the signs in the swiss alps are time, not distance. Which makes sense given how steep many of them are -- even if it's not your pace, it's a quick summary of distance + elevation. Perhaps this is less needed in Cze
77.
by improbable22 7y ago
Right. Although IIRC there is also a danger of them over-dosing on some of this, if given a whole meal of liver or something. They're wired to like it, but nature didn't bother with a mechanism to know when to stop.
78.
by improbable22 7y ago
But just raw muscle isn't necessarily great -- I think there are lots of nutrients they would get from specific organs in the wild. One vet's recommendation was to alternate with high-tech dry food, which is likely to have these t
79.
by improbable22 7y ago
People do write their own AD tools... in a day, sometimes! http://blog.rogerluo.me/2018/10/23/write-an-ad-in-one-day/ http://blog.rogerluo.me/2019/07/27/yassad/ Altho
80.
by improbable22 7y ago
In quite a few countries, string theorists (and usually GR people too) are far more likely to be in mathematics departments than in physics. Pretty much for the reasons you describe -- GR was seen in the 60s as an exotic mathematical playgr
81.
by improbable22 7y ago
"would have trouble making predictions. Physicists have made this criticism since the beginning." You can go one step further. If you regard string theory as an attempt to answer questions about quantum gravity, then this criticis
82.
by improbable22 7y ago
This is what PackageCompiler.jl aims to do, for whatever plotting etc. packages you use all the time. It seems to work well for some people but is, right now, a bit fiddly to get set up.
83.
by improbable22 7y ago
Which sounds like a terrible trade-off, harm isn't linear here. Two leaks, each of 1000 barrels, will badly damage two different valleys. One leak of 2000 barrels would be better. And cost isn't linear either, two half-capacity pi
84.
by improbable22 7y ago
What's the one-minute pitch for using this, over say Python or Julia? I couldn't figure this out from a quick skim.
85.
by improbable22 7y ago
If western architecture means northern europe, then I think they were rather more concerned with heating than cooling. Southern europe took a lot more care (fountains, shutters, huge thick walls...). But it's still a long way from the
86.
by improbable22 7y ago
Many modern buildings are indeed wasteful, maybe they could use half the AC. But comparing to traditional buildings which were grand public spaces may be a bit misleading -- that mosque in Cairo may well occupy the space of 100 apartments,
87.
by improbable22 7y ago
If your AC is producing 25-degree air, it'll be quite dry, which London is not. (But Harare is, I believe.) That said 25 should still be fine, but there are days which are 30 & humid, which are pretty uncomfortable. Not so many, bu
88.
by improbable22 7y ago
No, I think you should simply download the ordinary version. Jupyter, Juno, etc. are easy enough to install locally. I forget the precise details, but I think JuliaPro comes with certain versions of packages, and it's less confusing ju
89.
by improbable22 7y ago
One more advantage to these libraries being written in Julia is that, if they are almost do what you need but not quite, it's often pretty easy to reach inside and patch the function which needs changing. You already speak the language
90.
by improbable22 7y ago
While this probably isn't a practical way to do any real work, running it with --compile=min gives some idea what might be possible soon: $ julia --compile=min -e '@time (using GR; plot(rand(20)))' 0.375836 second

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