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Joined 11 months ago
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Cake day: December 26th, 2023

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  • homura1650@lemm.eetoScience Memes@mander.xyzScience is Magic
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    3 months ago

    Quantum mechanics is not magic. Magic specifies the outcome, but not how a system evolves to reach that outcome. Quantum mechanics has precise equations describing how a system will evolve over time, but is famously bad at describing the outcome.

    By the same token, we can see that thermodynamics and conservation laws, while widely accepted, are magic. I have heard legend of a deeper magic known as “Lagragians”, although knowledge of that lost art remains confines to the warlocks’ ivory tower.

    https://xkcd.com/2904/


  • homura1650@lemm.eetoScience Memes@mander.xyzBreast Cancer
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    3 months ago

    The AI developers understand how AI works, but that does not mean that they understand the thing that the AI is trained to detect.

    For instance, the cutting edge in protein folding (at least as of a few years ago) is Google’s AlphaFold. I’m sure the AI researchers behind AlphaFold understand AI and how it works. And I am sure that they have an above average understanding of molecular biology. However, they do not understand protein folding better than the physisits and chemists who have spent their lives studying the field. The core of their understanding is “the answer is somewhere in this dataset. All we need to do is figure out how to through ungoddly amounts of compute at it, and we can make predictions”. Working out how to productivly throw that much compute power at a problem is not easy either, and that is what ML researchers understand and are experts in.

    In the same way, the researchers here understand how to go from a large dataset of breast images to cancer predictions, but that does not mean they have any understanding of cancer. And certainly not a better understanding than the researchers who have spent their lives studying it.

    An open problem in ML research is how to take the billions of parameters that define an ML model and extract useful information that can provide insights to help human experts understand the system (both in general, and in understanding the reasoning for a specific classification). Progress has been made here as well, but it is still a long way from being solved.


  • Biden tried to restart the deal back in 2021, and has been trying ever since.

    However, it turns out that the US is not the only party involved in international treaties. We can’t just pick up the ball and go home mid game, then come back in a year with a new coach and expect everyone to continue playing like nothing happened

    The original deal was a difficult achievement on its own. Now, we need to not only repeat that, but also deal with the fact that Iran does not trust us to follow through with our end of the deal. Overcoming that needs good negotiation, and a lot of concessions we did not want to make.

    This is why administrations of both parties have historically upheld deals made by the opposing party that they didn’t like. Unilaterally breaking deals every 4 years because of who wins an election makes the US a non-credible partner in negotiations. You can’t just wave a wand and fix that.


  • I think what happened here is that something went wrong and messed up the permissions of some of the users files. MS help suggested that he login as an administrator and reatore the intended permissions.

    I don’t work with Windows boxes, but see a similar situation come up often enough on Linux boxes. Typically, the cause is that the user elevated to root (e.g. the administrator account) and did something that probably should have been done from their normal account. Now, root owns some user files and things are a big mess until you go back to root and restore the permissions.

    It use to be that this type of thing was not an issue on single user machines, because the one user had full privileges. The industry has since settled on a model of a single user nachine where the user typically has limited privileges, but can elevate when needed. This protects against a lot of ways a user can accidentally destroy their system.

    Having said that, my understanding of Windows is that in a typical single user setup, you can elevate a single program to admin privileges by right clicking and selecting “run as administrator”, so the advice to login as an administrator may not have been nessasary.







  • Java did have a Security Manager that can be used to prevent this sort of thing. The original thinking was that the Java runtime would essentially be an OS, and you could have different applets running within the runtime. This required a permission system where you could confine the permissions of parts of a Java program without confining the entire thing; which led to the Java security manager.

    Having said that, the Java Security Manager, while an interesting idea, has never been good. The only place it has ever seen significant use was in webapps, where it earned Java the reputation for being insecure. Nowadays, Java webapps are ancient history due to the success of Javascript.

    The security manager was depreciated in Java 17, and I believe removed entirely in Java 21.



  • homura1650@lemm.eetoScience Memes@mander.xyzPhysics
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    8 months ago

    The difference between physics and magic is that physics works by describing the forces acting on a system. To predict an outcome, you just progressivly apply those forces over time.

    With magic, you just specify the outcome, but not how you get there.

    This is how we know that thermodynamics is magic. Conservation laws and Lagrangeans too.

    https://xkcd.com/2904/


  • homura1650@lemm.eetoAutism@lemmy.worldWhy is it so hard for you?
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    8 months ago

    Until I noticed what community I was in, I interpreted it completely differently. The women is engaging in a niche hobby of making something in a particular and esoteric way, and the man just bought a mass produced version of the thing; thereby completely missing the point of what she was doing.

    Like, if I wanms building a chair using hand tools and an unproccessed log. Sure, you could go to a furniture store and buy a chair, or maybe Ikea and “build” one; but that completely misses the point.


  • There are still a lot of rather arbitrary decisions to make.

    Is 4/pi inside or outside of the summation?

    Is it (-1)^n+1 or (-1)^n with an additional negative sign in any of the other natural locations for it.

    Is the e term outside of the fraction with a negative exponent, or part of the denominator.

    Do you start with n=0 or n=1 (and adjust the terms inside the summation accordingly)

    Did they expand (2n+1)^2?