The Nineteenth Byte

2:04 PM

@BaldBantha Oh, I see now. Anyway, why are they comparing it to Halo? I'm seeing Star Wars: Battlefront 2 and Shattered Horizon.

Maybe it's because I haven't yet had the opportunity to play Halo 4 or 5... :(

Nathan Merrill

so...this is really cool

Neural Network that Changes Everything - Computerphile

►

how they use neural networks to process images

PhiNotPi

Chris & Steve O 'Hiding in Zebra Suits (Pride of Lions attack)

►

Nathan Merrill

basically, instead of weights, they use image filters, and downsample each layer

and then you end up with a bunch of 1-pixel images, which can be used as a bunch of nodes in a neural network

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Array of Integers to Array of Digits code-golf Given an array of arbitrary length containing only integers, output an array of integers of each digit of each integer in the array. Notes The input array will only consist of integers The outputted array must be exactly 1 deep and contain only ...

Fatalize

@NathanMerrill Title is a bit misleading though, CNN have existed for more than 15 years now, whereas the "changes everything" makes it sound like it's completely new

Also, there is no "obligation" to use sufficiently many layers until you get 1-pixel images. In fact, most CNNs architectures stop much higher than that

But overall this video isn't too bad

Nathan Merrill

2:15 PM

but then how do you turn an image into a node?

Fatalize

Connect pixels to the classification layer

except that you have more pixels than 1, but less images

Nathan Merrill

right, but what is the numerical value of a 10x10 image?

Fatalize

?

Nathan Merrill

oh, each pixel in the 10x10 is a node?

Fatalize

you connect each pixel of the 10x10 image

as input to the next layer

Nathan Merrill

2:17 PM

oh, so you end up with 100X more nodes

but less "filtering" steps

Fatalize

Backpropagation running times is also heavily dependant on the number of layers

Nathan Merrill

yeah

do you change the size of the filter from layer to layer?

or are they typically always the same size

Fatalize

depends on the architecture, usually they change a bit

e.g. 5x5 kernel on the input, then a layer of maxpooling to divide the sides of the image by 2, then 7x7 kernels

is a thing I have seen

zyabin101

In the meantime, can please someone help name the "goodbye gem"? >_>

Fatalize

This is done because you typically want the kernels of layer n to capture more high level things than kernels in the layer n-1

so they have to be less localized in a sense

reducing the size of the image and enlarging the kernel both contribute to that

Nathan Merrill

2:25 PM

and they have the benefit of requiring less processing

Fatalize

Here's one CNN architecture for face detection

The second layer of convolution has smaller kernels but that's because the images are quite small

You can see that there's no convolution between S2 and N1, they just connect each image to one neuron

El'endia Starman

Idea for a game: FPS in an indoor environment with multiple portals that have a high chance of changing their connections if no one is looking at them.

You could literally run around a corner and disappear.

RenderSettings

Random changing portals sounds like hell for any kind of serious play

El'endia Starman

Yeah, but that would be its main selling point. It's an esoteric feature other games don't have.

Well, Antichamber kinda has that in a couple places.

RenderSettings

I love the idea of rooms where the doorways change location when you look away, though

mm

Nathan Merrill

2:30 PM

but, if you had one end of a Portal gun, it'd be pretty fun

zyabin101

D:

PhiNotPi

The two teams each have one-half the portal gun.

RenderSettings

The places where Antichamber swap around doors are all consistant, though. It doesn't randomly change where a doorway leads

Nathan Merrill

nah, I'd make pairs of teammates have each end

RenderSettings

Ooh, that's a fun idea

El'endia Starman

2:32 PM

Oooh, I do like that. Four players, two per team, each team has one side of a portal.

Nathan Merrill

I was actually indicating each player has one side, and each team has both sides

zyabin101

Everyone ignores me... :(

El'endia Starman

@RenderSettings Yeah. It does have the feature of a portal appearing or disappearing when you're not looking.

Nathan Merrill

but no matter how you arrange it, combining FPS and Portal sounds fun

El'endia Starman

@NathanMerrill Ack, yeah, I wrote that wrong. Each player on a team has one side of their team's portal.

Nathan Merrill

2:34 PM

anyways, I think that portals would have to have a slower travel time

trichoplax

@zyabin101 Not jumping to do work for you isn't the same as ignoring you. You get responses in conversation

Nathan Merrill

because I could teleport to safety, then immediately close the portal on the other side

Dr Green Eggs and Ham DJ

0

A: Separate alphabets and numbers

V, 12 bytes òí¨Ä©¨ä©/²± V, is an unfinished, 2D string based golfing language. Although it is unfinished, this program works as of commit 45, which was published last night, making this a competing answer. (Most of my previous V answers were non-competing.) Note, the trailing newline is nec...

zyabin101

Okay, then I'll just wait for @Downgoat ;_;

Nathan Merrill

oh, actually, better idea

give the portal gun a cooldown

like, 5 seconds

trichoplax

2:36 PM

@zyabin101 The standard response is "what have you tried"... :)

Fatalize

@DrGreenEggsandHamDJ what kind of encoding does this use?

Dr Green Eggs and Ham DJ

Latin1

I'm probably going to need a custom encoding at some point.

I provided a hexdump though.

Fatalize

I think you will if you don't want to use standard symbols

cause ò for recursively do doesn't really make much sense to me for example :p

zyabin101

I should make an userscript that makes a message for when your friends appear in chat.

Dr Green Eggs and Ham DJ

Haha, it doesn't make sense unless you understand how to type it in vim.

In which case it makes perfect sense.

Fatalize

2:39 PM

"sense" "vim" that's a contradiction

2

Dr Green Eggs and Ham DJ

No it isn't. My brain thinks in vim<esc>:wq<cr>

trichoplax

@zyabin101 That sounds like a really good idea.

zyabin101

@trichoplax :D

I need help to make it.

trichoplax

Some people might call it "StalkerScript" though...

Meanbits

@trichoplax I still haven't figured out why people even bother leaving ;)

Fatalize

2:40 PM

@DrGreenEggsandHamDJ what's the overall design/paradigm of V? (and why that name?)

Bálint

I finally have perspective and a camera

trichoplax

@Meanbits I've heard some people have "real lives" but I'm not really sure what that means

zyabin101

@Bálint And you use WebGL for that! D:

Bálint

Only a KB and it isn't golfed

@zyabin101 No

Dr Green Eggs and Ham DJ

@Fatalize It's very different than any language I've ever used.

zyabin101

2:41 PM

@Bálint Good!

Then publish it in a fiddle.

Or somewhere where I can try your script.

Dr Green Eggs and Ham DJ

It works in an infinite 2D array of strings, and every single command is a string-based command that changes the text in the buffer.

Meanbits

@trichoplax I've got one of those!

zyabin101

@Meanbits You don't have it now.

Meanbits

I meant more that my browser tab still stays open even when I'm out doing "real life" stuff.

zyabin101

A mean daughter stole it.

El'endia Starman

2:42 PM

@NathanMerrill: In any case, we first need a non-Euclidean game engine and raytracer. Time to get PPCG to do it for us! (code-golf)

Meanbits

So a script wouldn't detect me "leaving" or "joining" often at all.

trichoplax

Yeah same here - if I'm on a train or a bus the TNB tab is still with me

zyabin101

We know by the Meanbits name.

Bálint

@zyabin101 The camera can't move yet, that's the next I want to achieve

But give me a minute, I publish it

El'endia Starman

@El'endiaStarman Ha, that would be some of the worst code ever, I'm sure. :P

Meanbits

2:43 PM

Uh oh, El'endia's talking to himself again.

trichoplax

@El'endiaStarman If you want to use this in a real game you probably want fastest-code ;)

Dr Green Eggs and Ham DJ

@Fatalize Oh yeah, and the name is because it's golfy vim.

El'endia Starman

@trichoplax Truuueee... :P

trichoplax

I'm always confused by extended silent "e"s

zyabin101

@trichoplax And append to it popularity-contest and most-support.

trichoplax

2:44 PM

tag-not-found

Dr Green Eggs and Ham DJ

@El'endiaStarman Like Antichamber?

Meanbits

fastest-popularity-challenge

El'endia Starman

What would be really cool (and probably really impractical) is to have one engine that can do non-Euclidean portals, non-Euclidean geometry (elliptical, hyperbolic), and relativistic effects.

zyabin101

@trichoplax most-support is whichever code has the most support.

Nathan Merrill

the problem with making PPCG do it is that our engine would be written in 50 different languages

2

zyabin101

2:45 PM

You elect a list of judges, and they see if code works on their computer.

Meanbits

@NathanMerrill Just port them all to scratch once you have the pieces >_>

trichoplax

Why not just link all the pieces with STDI/O?

PhiNotPi

@El'endiaStarman Science question: how does relativity work in elliptic/hyperbolic space?

El'endia Starman

@NathanMerrill Bahaha. Well, probably more like five. Java, C#, JavaScript, Python, and C++.

zyabin101

The code that has most judges with positive reviews wins.

@Downgoat hello

El'endia Starman

2:47 PM

@PhiNotPi No idea! Hmm, well, Minkowskian space-time is hyperbolic, I think.

zyabin101

Could you please come to the zyabinVI beta room?

Fatalize

@DrGreenEggsandHamDJ A golfy Vim? Hell no

Downgoat

@zyabin101 hello

Dr Green Eggs and Ham DJ

Why not? It works.

And it's competitive.

Fatalize

Vim = unusable, golf languages = unreadable

zyabin101

2:48 PM

@Downgoat Hello

Fatalize

both = hell on earth

Dr Green Eggs and Ham DJ

s/unusable/has a learning curve

zyabin101

@Downgoat ^^^^^^^^^

Downgoat

@Fatalize ಠ_ಠ

Dr Green Eggs and Ham DJ

Clearly it's usable if it's one of the most popular text editors of all time.

Downgoat

2:49 PM

^

Fatalize

I'm pretty sure you over estimate the number of Vim users :p

mbomb007

Regex question: What is (?<counter>) syntax called in .NET regex? I don't know, so I can't look up more info on it.

Downgoat

@mbomb007 named capture group

El'endia Starman

@Fatalize That's like saying that higher math is incomprehensible.

Poke

@Fatalize Lifehacker agrees that vim is pretty popular lifehacker.com/five-best-text-editors-1564907215

Dr Green Eggs and Ham DJ

2:52 PM

@Fatalize 26% of stack overflow users who answered this years developer survey use vim.

Fatalize

@DrGreenEggsandHamDJ That's biased, SO users, that also are willing to answer a survey are a very tiny and non-representative sample of all developpers

Dr Green Eggs and Ham DJ

Why are you so negative? Did vim hurt you as a child?

:P

New Main Posts

1

Q: Parse a 1D language

Given a string containing only 0's 1's, 2's and brackets, output the grammar tree of the string. A 2 requires 2 arguments - one to the left and one to the right A 1 requires a single argument - to either the left or right A 0 doesn't require any arguments and is the base case A pair of bracke...

Bálint

@zyabin101 jsfiddle.net/csn5nw20

El'endia Starman

@Fatalize Still totally destroys your "unusable" argument. :P

mbomb007

2:58 PM

@Downgoat If this is an input string: abc1def\nghiJkl, I want to match it with (.*)(1).*\n.{length of \1}(.).*

How do I do that?

So $2 is 1 and $3 is J

It's a contrived example, but I've never had to do this in regex before.

quartata

@El'endiaStarman Ugh, is Randall using a regex for primality testing?

El'endia Starman

@quartata Ha, I didn't even notice that.

Downgoat

I'm on my phone right now so I can't really type regex. :|

zyabin101

@Bálint Another look on a terrain

Apparently the c.translate() function moves the camera!

mbomb007

@Downgoat K. I just don't really know how to match for the same length as a previous match.

Bálint

3:02 PM

That moves the plane

But technically yes

quartata

@Fatalize That's weird:

?- consult("test.pro").
true.

?- test.
|: a
false.

?-

mbomb007

@quartata "yes hello this is a glider"... no, it's not, lol.

Pikachu

Downgoat

@mbomb007 depends on the characters but do you must use regex for this job?

El'endia Starman

@mbomb007 I thought it was Pichu.

mbomb007

I'm trying to solve a challenge in Retina.

quartata

3:05 PM

@El'endiaStarman It is

TimmyD

@quartata Why not? It's a perfectly legitimate strategy ...

Downgoat

@mbomb007 oh, that's different

mbomb007

@quartata They're all the same species. Pichu = Pikachu = Raichu

quartata

@TimmyD Not in production code

mbomb007

@Downgoat No, it's not. I want to do exactly what I've said in a single capture.

I'm pretty sure it's possible in .NET syntax.

TimmyD

3:07 PM

@quartata Pretty sure using Photoshop to patch up your code isn't production-worthy, either ;-)

mbomb007

@TimmyD Unless you're using Piet.

quartata

@mbomb007 I usually use GIMP for that but yeah

El'endia Starman

Oooh, I wonder how mangled Piet code becomes if you try to Photoshop-patch it. :P

TimmyD

Hah, that'd be interesting.

Downgoat

@mbomb007 then I'm not sure but there's probably still some esoteric way to do it. Maybe ask our local regex guru @MartinBüttner?

TimmyD

3:08 PM

Run a Piet code through the "Patch an image" challenge and see what happens.

Bálint

@zyabin101 It actually runs with almsot 30 fps, that's amazing

zyabin101

@Bálint \o/ Fiddle?

Martin Büttner

@mbomb007 what exactly are you trying?

Bálint

@zyabin101 I create an animation, then I put it up

mbomb007

@Downgoat I thought there was maybe a way to do it with that "stack" syntax that pushes/pops for certain matches? That's how parentheses grouping works.

@MartinBüttner chat.stackexchange.com/transcript/message/29891912#29891912

Martin Büttner

3:11 PM

(.)*1.*\n(?<-1>.)*(.).*

quartata

@mbomb007 You mean balancing groups?

Martin Büttner

^

mbomb007

Yeah! That's the term I couldn't think of for Googling

Thanks.

quartata

117

A: What are regular expression Balancing Groups?

As far as I know, balancing groups are unique to .NET's regex flavor. Aside: Repeated Groups First, you need to know that .NET is (again, as far as I know) the only regex flavor that lets you access multiple captures of a single capturing group (not in backreferences but after the match has com...

for future reference

mbomb007

@quartata I've already seen that answer, but it's hard to find info on that when you don't remember what it's called.

quartata

3:13 PM

Oh, heh :P

mbomb007

Nothing relevant came up, so you probably have to have the words "balancing group" for anything to show up.

El'endia Starman

@DrGreenEggsandHamDJ Is their engine open-source and/or free?

Hmm, looks like it was made with Unreal Engine...

mbomb007

@El'endiaStarman Makes sense that non-Euclidean geometry is done in Unreal.

trichoplax

@NathanMerrill I was suggesting requiring the number of pixels being output in order to help you - unless you have a trick for judging solutions?

Nathan Merrill

there are other ways to count, and some algorithms (like check every pixel) don't need counting

I'd prefer to not make it a requirement, though most answers likely will

trichoplax

3:18 PM

Fair enough

TimmyD

@quartata TIL

trichoplax

@NathanMerrill Also, if you need solutions to be deterministic/fixed seed, it's worth mentioning it in the challenge as it's easy to write code without even thinking about that, and lots of languages randomise the seed by default

Nathan Merrill

yeah

quartata

@TimmyD I personally prefer recursive patterns but the idea is cool

Martin Büttner

@quartata meh :P

quartata

3:25 PM

Something I was thinking about perhaps was a (?+... which stores how many characters are matched in a register of some sort and then a % quantifier that matches that many characters

El'endia Starman

@PhiNotPi: Something crazy I just thought of: let the curvature of space be sin(x+y). So it's a patchwork of elliptical and hyperbolic geometries.

Are there any consistency issues here?

zyabin101

I can't find that one message about commiting a "crucial bug"... Can someone link me to it?

PhiNotPi

@El'endiaStarman do you mean sin(x)*sin(y)? because sin(x+y) gives the same effect as sin(x)

El'endia Starman

@PhiNotPi Oh, yeah, that's what I mean.

May 15 at 9:56, by Mars Ultor

> I'm about to commit a crucial bug - Quill 2016

zyabin101

@El'endiaStarman Thanks.

trichoplax

3:31 PM

I see chat search is still down :(

El'endia Starman

Yeah. I used Google - site:chat.stackexchange.com "crucial bug"

trichoplax

That works??

Wow

zyabin101

@trichoplax It works for until somewhere in the middle of 2015.

trichoplax

They've made 1 year's progress since yesterday then - hopefully we'll be up to date by tomorrow...

Fatalize

4:17 PM

@quartata told you to not enter a linefeed after a :p

type a and c one after the other, then a linefeed

wizzwizz4

@Meanbits It wasn't.

quartata

@Fatalize Ohh I see now

Fatalize

@quartata otherwise after reading a, it will already have another char to read, which would be the linefeed which is not c

so in short this predicate is bad to read user input

quartata

Actually this is perfect for what I want

(now that I know how it works at least)

Fatalize

what is it that you want?

Lembik

4:21 PM

hi all

any android users in? How do you transfer a video from your PC to the external SD card of your android phone?

zyabin101

:D

quartata

I was just experimenting with it but what I wanted to do in the end was read a whole line and go over it character by character

zyabin101

github.com/zyabinVI/goodbye_translated

quartata

I thought get_char would prompt for one char at a time but it does this instead which is exactly what I wanted

zyabin101

@Lembik hi part of all

Daaaaarn!

wizzwizz4

4:22 PM

Technically, `get_char` *does* take one character at a time.
But the input from most terminals is line-buffered.

zyabin101

@Lembik On Windows, after opening the smartphone, you'll see a list of drives. Choose something along the lines of "SD card" and you'll be clear.

quartata

@wizzwizz4 It unifies one character at a time from the stream but it doesn't prompt for one character at a time

It prompts once and that's the contents of the stream

Lembik

@zyabin101 thanks.. you can just dump stuff in there. I always assumed your files had to go somewhere special

that was meant to be a question :)

wizzwizz4

@quartata It reads one character at a time. The entire "line" thing is just a terminal thing.

quartata

No, it's not a terminal thing.

This is from the REPL

wizzwizz4

4:25 PM

@quartata Ok, it's an environment thing.

It's rarely built into programs.

By rarely, I mean "yeah, in theory, but who reinvents the wheel(?)".

quartata

It wouldn't prompt at all in an actual program.

zyabin101

@Lembik np

quartata

At least, not in that sense

wizzwizz4

@quartata Yet input would still be line-buffered.

If your program was waiting for stdin, it would only run every linefeed up until it had consumed that line.

Lembik

@zyabin101 my phone has more storage than my ipad :)

so the next challenge is to get the phone to stream the video to my ipad :)

quartata

4:28 PM

That would be if it was waiting for a line; if it was just reading for STDIN it would block until EOF

wizzwizz4

@Lembik My (pet) server farm has more storage than my brain.

zyabin101

@Lembik I don't know how.

Fatalize

@quartata you're doing this just for fun?

wizzwizz4

@quartata Most environments' stdin streams are line-buffered.

quartata

@Fatalize Oh, yeah. It's not Brachylog related

Lembik

4:30 PM

@wizzwizz4 :)

Fatalize

could be work related (although not very probable :p)

Lembik

@zyabin101 I think android can be a dlna server

wizzwizz4

@quartata, you haven't actually provided a counter-argument yet. Yet you are arguing. Why?

And... everyone's quiet again.

Fatalize

On another note, I haven't had a single good idea for a challenge in weeks, that's frustrating

wizzwizz4

@Fatalize I had a really good idea for a challenge, and I was...

Fatalize

4:35 PM

...was?

wizzwizz4

It was in my tabs, before I accidently clicked "Update and Shut Down" instead of "Hibernate".

So was most of my work, actually.

quartata

@Fatalize I hope I never have to work with Prolog in production

Sorry but

wizzwizz4

Nothing that was very important, just stuff that was interesting.

Fatalize

Fun fact: I have never used Prolog outside school and PPCG

El'endia Starman

I found another glider I'm not sure I've seen before:

Edwin Buck, Houston, TX

164 2

anatomy cell-biology evolution genetics human-anatomy human-evolution immunology

43.6k SO rep though.

wizzwizz4

4:38 PM

We used to have a glider here. Where've they got to?

Fatalize

quartata was one

zyabin101

@wizzwizz4 They became a Pichu.

Sleepy spiky eared Pichu that's so adorable.

2

wizzwizz4

@zyabin101 I thought it was quartata!

zyabin101

@wizzwizz4 Yes. It was quartata!

>.<

hugs @quartata

Fatalize

^ it's not very effective...

zyabin101

4:40 PM

@Fatalize I'm not battling with @quartata.

wizzwizz4

@zyabin101 fainted

quartata

@El'endiaStarman Yeah definitely not me, I'm too lazy to get SO rep

Nor am I cool enough to have ever worked at Cisco

zyabin101

@wizzwizz4 I didn't even h--- becomes unconscious

wizzwizz4

@zyabin101 m̵̵̛̛͚̝̰̳̟ͧ͑̑̊̍̽̃ͅi̵͈̮̪͚̖̾̍͒͆ͩͩ͢͞ͅs̷̵̴̢̘͇̼͔̞̹̠̻ͬ̏͊ͮͥ̀s̷̨̨̼̤̖̏̒̉̍͑̌̂̇̌͛ͣ̐̅ͣ͂͑̏́͢‌̖̟̯̰̳͍̙̯͇̫̜͔̯̺̠̖i͈̪͉̭̊̂̊ͣͭ͑͗̿̅ͣ̐ͩͩ̓ͨ̀̀̚̚͘ṅ̡̨̛͓̺̦͇̥̪̞͔̙̝͎͇͍̠̣̻̯̒̊͋̒̌͟g̵̡ͥ̆̏ͪ̃̔̚͜͝‌̩̺̰̺̣͍̞͉͈̞̟͞ň̵̓̂̽͐̃҉̴̧͔̭̠͍͘ͅo̓̔̔ͪ̋͂ͭ͂̆̀ͥ҉͙̭̱̹̭͎̦̘͡ gained n̅̔ͫ͋͊͊ͣ͗ͬ̿̽͒̈͏̷͘͏̡͎̙̘̻͙̦̗͕̲̪͇̦̣͕͇͉͍̭̥ả̛͔̬̮͍̫ͨ̇̎̓̓̏̔̈͒̎̋͛̇̀n̡̢̡̢̜͕̻͍̂ͪ̓ͮ͆̀ͮͧ̈͂͠‌͈̬̼̣̥͉̖͇͍͖ XP.