What we see in the sky at night - how well does that view represent the material structure of the immediate vicinity of the Earth?
Apparently the brightest stars aren't necessarily the closest. Does closeness affect the brightness perceived by the human eye much at all? Roughly what portion of the visibly brightest stars are actually "closer"? Roughly what portion of the stars in the radius where we can see stars at all are not visible to the human eye?
All in all, how well can we observe the nearest region of the universe with just our eyes?
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https://in-the-sky.org/ngc3d.php
There are LOTS of 3d mappings of this now. This is NOT the best but answers yr q
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http://www.esa.int/spaceinimages/Images/2016/09/Gaia_s_first_sky_map
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>>8492007
you can calculate a good approximation of the actual distance from the red shift because you know the spectral emission lines of the star (typically hydrogen).
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Make it happen faggots.
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>living in a undrinkable pool with edible monsters
no
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That would be too complicated and expensive but there are some videos on youtube where people have built their own islands out of trash. https://www.youtube.com/watch?v=El6AU3riRI8
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Anonymous
MAKE DEEP LEARNING GREAT AGAIN 2016-11-23 08:53:36 Post No.8491581
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MAKE DEEP LEARNING GREAT AGAIN 2016-11-23 08:53:36 Post No.8491581
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MAKE DEEP LEARNING GREAT AGAIN
Anonymous
2016-11-23 08:53:36
Post No. 8491581
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Okay /sci/, I'm giving each of you the opportunity to make a big advancement in the field of machine learning. I started this project off as a short curiosity, and three days later it is taking over my life. I feel like I'm extremely close to solving this, and the possibilities are tantalizing, but I've felt like success was right around the corner for a couple days now. The only way I see out is to dump this project on someone else, in hopes that they can either finish it themselves or give some helpful feedback.
There's this thing in machine learning called "The Vanishing Gradient Problem." I would explain what it is, but if you don't already know then you probably won't be able to help here. I'm trying to get around vanishing gradients by using logical error signals instead of gradient based ones. In other words, I start out at the bottom of the network, compare the output to the ideal output, and then determine whether each of the output neurons should have put out a "bigger" or "smaller" value. Instead of propagating the gradient, I propagate this "bigger" or "smaller" signal up the network.
Not only can I quickly train arbitrarily deep networks this way, but the computation is made orders of magnitude more efficient. Learning AND and OR gates works great. The trouble is that I'm having a hard time achieving nonlinear separability. I'm using a modified step function (f(x) = -1 for x <= 0, and f(x) = 1 for x > 0) so I *ought* to be able to learn XOR since I have a nonlinear activation function, but for some reason it still doesn't work.
Could someone please try to figure this out? You can take all the credit.
Here's the code:
https://gist.github.com/anonymous/e02d15e82975f9aa5b18831a7dff5a56
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There's more stuff to talk about, but it's too much to type out in one sitting, so please ask questions
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Bunp for intrest, doing a research prohect learning orentation of object using convnets. Im having serious vanishing gradient issues.
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>>8491581
>"The Vanishing Gradient Problem."
Already solved by batch normalization.
Bye bye.
Anonymous
Humans on Mars long after we colonize it 2016-11-23 07:18:26 Post No.8491466
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Humans on Mars long after we colonize it 2016-11-23 07:18:26 Post No.8491466
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Humans on Mars long after we colonize it
Anonymous
2016-11-23 07:18:26
Post No. 8491466
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Here is a hypothetical scenario that I don't think I have never heard any documentary, news outlet, or even podcast ever mention regarding human beings living on Mars.
>Humans colonize Mars
>We make permanent residence on our new home planet
>We begin breeding on Mars (assuming it is possible)
>A generation of new Martian born humans rises
How exactly will Mars effect the way we reproduce and how exactly will these new Martian humans look like or even be like biologically? Mars's gravity is about 3.711 m/s^2 which means Mars only has 37-38% earths gravity. It is well known that just based on how long NASA astronauts tend to spend in Space in a zero G weightless environment that human body goes through lots of changes and affects like loss of muscle and bone mass. Read more here: http://www.space.com/23017-weightlessness.html
Point being, assuming that humans can even breed on Mars despite the low gravity, how exactly will Mars's overall conditions affect how Humans grow up, how their immune system will function, growth rate, bone density levels or muscle mass. Will Martian born humans DNA mutate and be completely different compared to an Earth born human?
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>>8491466
We don't even know if we can get a boner in 1/3 gravity. We know we can't get one in low gravity orbit. We might have to learn to do it while spinning.
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>we put a man on the mars
>we put a man on the moons
>implying we can't build gravity spin spin machine
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>>8491481
>We know we can't get one in low gravity orbit.
Would you care to cite a source on that?
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>tfw electrostatics/magnetism exam tomorrow
>don't even know what a Tesla is
Just fuck my life up senpai
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>>8489695
please take your blogshit to /r9k/
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>>8489695
You're an idiot.
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>>8489695
I passed EM with a B and I'm still not sure how any of that shit works.
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Assume a cpu made entirely out of room-temperature superconductors with the skylake microarchetecture. What would ultimately prevent me from overclocking said cpu to some arbitrary high frequency? (Ex: 300 billion GHz)
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Temperature
Fuck off with hypothetical statements
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>>8488984
Fine. Your mother fucks black men.
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>>8488973
Every bit flip produces kT*ln2 units of heat
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Why is group theory the single greatest subject on God's green Earth?
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>>8487504
what's an example of its use in engineering, CS, or social sciences
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list one thing group theory is useful for
hard mode: no physics or chemistry or math
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>>8487531
describes the symmetries of different minerals in geology.
If they end up calling it dark propulsion Im literally going to punch someone
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ya i think they should name it hypothetical dark propulsion cause it like people say it violates the laws of thermodynamics or something lol
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>>8484265
it's already got a name, bud, and that is memeDrive.
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>>8484265
They actually might, I'm tired of explaining to people that "dark" is a meme word used by scientists to explain anything they can't directly observe.
Anonymous
SQT - Stupid questions thread 2016-11-19 18:47:56 Post No.8483709
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SQT - Stupid questions thread
Anonymous
2016-11-19 18:47:56
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I don't understand the concept of potential energy.
"When a test charge q_0 is placed in an electric field created by some source charge distribution, the electric force acting on the test charge is q_0E. The force q_0E is conservative because the force between charges described by Coulomb's law is conservative."
Okay this is all fine.
"When the test charge is moved in the field by some external agent, the work done by the field on the charge is equal to the negative of the work done by the external agent causing the displacement"
What does that mean?
If there is a charge q_0 in an electric field E and I move that charge along the direction of the electric field then the work I do on the charge is qEd correct? Then then the work done by the field on is -qEd?
Can someone give me a better explanation? Where does the negative sign come from?
Some clarification on work done by the external agent and work done by the field would be helpful too. Why does the field do work when I am the one that moves it?
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How did time dilate over time as the universe expanded ?
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>>8483709
>Where does the negative sign come from?
Total work is zero, or the kinetic energy would have to change.
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>>8483709
>Why does the field do work when I am the one that moves it?
Both you and the field are exerting forces on the charge. Anything that exerts a force on something that moves does work on it.
Why is being transgender not considered a mental ilness?
Body integrity identity disorder is considered a mental illness. Doctors will refuse to amputate limbs without a medical reason.
Why then, should doctors cut someones dick off because they feel like their body doesn't belong to them?
Is it because of politics?
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>>8488244
Some psychologists declared that it is by all means a mental illness but left wing and center MSM just gave them shit and right wing MSM just didn't pay attention. Fringe media like Breitbart, Drudge Report, and Huffington probably overblew it in their own respective ideologies.
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it's soft eugenics
do you really wanna tell the guy who is convinced he's a woman to suck it up and pass on his genes or do you want to goad him into castrating himself?
either way I sincerely feel sorry for them
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>>8488244
Transgender-ness is an illness. Politics will debate if it is right to call this people sick, but it is an illness by definition.
The problem is where you draw the line on how to treat this people, should you subjugate the body to mind and give the patients special hormones and summit them to body change surgeries.
Or prioritize the body and potentially cause psychological trauma on them.
Either way, poor bastards.
Anonymous
Why aren't you working at Blue Origin yet? 2016-11-21 05:28:37 Post No.8487472
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Why aren't you working at Blue Origin yet? 2016-11-21 05:28:37 Post No.8487472
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Why aren't you working at Blue Origin yet?
Anonymous
2016-11-21 05:28:37
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They're the only company advancing the final frontier right now, so why haven't you put your skills to good use and applied there, /sci/?
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>>8487472
Someone clearly drank the coolaid.
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>>8487472
>aerospace
>website has a lot of meme shit about engineering and pseudo-philosphical shit regarding humans. actually their entire site looks like some fake shit; all memes, no substance
not the hundreds of other pressing technological, economical and social issues of our world at large
yeah nah
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>>8488257
>not the hundreds of other pressing technological, economical and social issues of our world at large
like what?
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http://www.msn.com/en-us/news/politics/trump-to-scrap-nasa-climate-research-in-crackdown-on-%E2%80%98politicized-science%E2%80%99/ar-AAkE8hm?li=BBmkt5R&ocid=spartanntp
Wake me up when this bullshit is over. Hopefully we're not fucked by then.
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Instead of wasting millions of dollars telling everyone the Earth will be 1 degree hotter in 100 years, we should be using the money to colonize the solar system
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>>8493078
instead of wasting money trying to colonize the solar system when we don't don't even have a rudimentary understanding of terraforming, we should be using that money to cut taxes for the rich. so they can create jobs and shit.
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>>8493095
We don't have an understanding of terraforming because the money was used to pay quacks who say the Earth is gonna turn into Venus because of carbon dioxide.
Would you consider psychology to be a science?
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>>8492892
No, because most of the time is never applied and neuroscience is a lot better than it
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>>8492892
i dont think psychology is even defined or homogenous enough as an area of study/discipline to even warrant that question.
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>>8492902
>neuroscience is a lot better than it
but neuroscience is fundamentally different from psychology...
Anonymous
Recommended Books For Math Contest Preparation 2016-11-24 00:53:10 Post No.8492784
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Recommended Books For Math Contest Preparation 2016-11-24 00:53:10 Post No.8492784
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Recommended Books For Math Contest Preparation
Anonymous
2016-11-24 00:53:10
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Hello everyone, I'm looking for a book to help me prepare for a high school level math contest, I was wondering if any of you could recommend me one based of your experience with the book. So far I've been looking at books on the University of Waterloo's CEMC book store, https://cemc2.math.uwaterloo.ca/contest/Sigma/publication/.
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>>8492784
Thank you all in advance btw.
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>>8492796
I appreciate you taking the time to reply, but I'm afraid I'll need something more helpful than this.
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hey /scitards
this dude on b has some dry ice and he's looking for shit to do
>>>/b/712784518
help him out.
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shove some in the anus
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>>8492743
always.
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Feed it to starving Africans