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Comment: Re:Good god (Score 1) 115

by serviscope_minor (#48640955) Attached to: Ask Slashdot: Resources For Kids Who Want To Make Games?

Jesus christ, man, he's 11. Get him RPG Maker and let him figure out how to make a game with his own made-up story behind it.


I don't think I'm exceptional by the standards of kids who learned to program. I started programming at age 11 because I wanted to write games. I managed to get a simple space invaders type game written myself from scratch in BASIC.

I the kid wants to learn to program games, 11 is an OK age to start.

Comment: Re:What about that stupid book is worth US$244? (Score 1) 166

by serviscope_minor (#48640915) Attached to: Calculus Textbook Author James Stewart Has Died

I really fucking hate this about academia.

Nope, you mean "American undergraduate university teaching", not academia.

This is not an academic thing. This is something very peculiar to undergraduate teaching in the US.

I think partly it is the obsession with setting millions of questions for students to do. That way one can make it easy on the lecturer by declaring that the student just do a bunch from a textbook.

The system I went through doesn't even remotely work in that way. At the very beginning the lecturer in question (which eventually included me, at least for a while) made a list of recommended books. There were usually about 4 or 5 of unspecified edition, and there would be a bunch of some of them in the various libraries. Students were very much NOT expected to buy any of them unless they really wanted to. As the courses got more specialised, the list of textbooks would get longer (as no book covered everything), then disappeared completely when it became too cutting edge.

Some of the lecturers more advanced in years would occasionally give a glowing recommendation to a book that went out of print some time during the paleocene. I suspect it was a book they found useful as an undergrad and never checked to see if was still in print.

We then lectured. Every so often, a sheet of about 10-15 questions was handed out such that there were about 4 sheets in a 16 lecture course. The questions and lecture notes are generally handed to the next person when the course moves on to a new lecturer for them to use or ignore as they see fit.

It works well. The question sheet means that a specfic edition of a book or even a specific book at all is not required. Us writing the questions means that there's more incentive to have a small number of good questions rather than vast heaps of busy work.

Comment: Re:What are the implications for the textbook mark (Score 1) 166

by serviscope_minor (#48640895) Attached to: Calculus Textbook Author James Stewart Has Died

I teach out of a thermodynamics text that gets churned every year or so.

Well, then don't. I went through university in the English system, up to and including being a lecturer for a while. The simple solution to this problem is simply to NOT teach out of a text book in this way. It is simply not in the unicersity culture here to to that.

Textbooks are helpful but the students do not need THAT specific textbook.

The first thing to do is write the questions yourself[*]. They're not nearly as hard to write as exam questions because frankly if you screw up a bit on one or two it matters much, much less, they also don't have to be a consistent length or difficulty. You also have a textbook full of questions for insipration. On the courses I was teaching, the lecturers would always hand materials to the next person, and the question sheets often had the year in which the questions were written. One nice undergraduate reminded my of my age by declaring that some of the questions were older than he was.

So, find a few good textbooks and recommend them to the students at the beginning of the course, as a genuine recommendation and not a recommend but I actually mean you have to buy this kind of thing. Then give your lectures and set your questions. The students can then work from the lectures, or any edition of any textbook.

[*] One problem is it seems the American system is based on setting vastly insane numers of questions, which may make this more difficult.

Comment: Re: Math author dies rich... (Score 2) 166

by serviscope_minor (#48640877) Attached to: Calculus Textbook Author James Stewart Has Died

Really though, the last ethics class I took required an e-book with a 3 use license and six month expiration that cost $130. So, after six months, there is no access to the material at all, like a returned library book without even the value of a paper-bound book that could be burned for warmth.

Well, ironically that probably taught you a lot about ethics.

Comment: Re:Most Unbiased Slashdot Gamergate Article (Score 1) 540

by serviscope_minor (#48632127) Attached to: FBI Confirms Open Investigation Into Gamergate

You should really look into dropping Gamergate entirely, to divest yourself of its now relatively toxic branding, and creating several focused movements to replace it.

"relatively" toxic branding. I like precision. I can indeed think of things with more toxic branding, but not all that many mind you.

Comment: Re:BBC should tale a good look at itself first (Score 1) 191

by serviscope_minor (#48632043) Attached to: Investigation: Apple Failing To Protect Chinese Factory Workers

Yep, the BBC is a single homogeneous unit, so the higher ups protecting Saville during his active years 20 years ago or whatever are EXACTLY the same people as those doing the investigation. On that note we should arrest the geniuses at the local Apple store for human rights abuses because they are clearly the same people.

Not to mention their disgraceful one side coverage of the Scottish referendum on Independence this year have left many like myself really not giving much of a shit as to what they have to "report" these days.

Well, Salmond's ludicrous wishlist er, I mean plan for independence was fatally flawed in many ways. The thing is the case against was mostly "the case for is really flawed". Which was true. But yeah, journalists should give equal weight to each sides. Teach the controversy!

Comment: Re:Clickbait (Score 1) 129

I called it cheating because they violated both one of the prime rules of AI: train on a data set that is more or less representative of the data set you will test with, and one of the prime rules of statistics

But they're not trying to do that. They're trying to debunk the claims of "near human" performance, which they do very nicely by showing that the algorithms make vast numbers of mistakes when the data in is not very, very close to the original data.

They also present a good way of finding amusing failure cases. I'd never thought of optimizing misclassifications to find how and where an algorithm fails.

Comment: Re:seems a lot like human vision to me (Score 1) 129

I think I understand... vaguely. To simplify, you're saying it's been trained on a specific dataset, and it chooses whichever image in the dataset the input is most like.

A bit.

It's easier to imagine in 2D. Imagine you have a bunch of height/weigt measurements and a lable telling you whether a person is overweight. Plot them on a graph, and you will see that in one corner people are generally overweight and in another corner, they are not.

If you have a new pair of measurements come along with no label, you could just find the closest height/weight pair and use that. That is in fact a nearest neighbour classifier. It works, except that you need to keep all the original data around.

If you imagine taking 1000 points along the two axes (1,000,000 in total) you could classify each of them according to who is nearest. If you do that you can see that there is more or less a line separating the two groups.

Machine learning is generally the process of finding that line, or an approximation to it somehow.

The DNNs don't find the nearest neighbour explicitly: they just tell you which side of the line a given input is on. They also have a bunch of domain specific knowledge buit in because we know something about the shape of the line, which helps find it. For example, image objects may be scaled up or down in size or distorted in a variety of ways.

Is that about the gist? I'm probably not going to understand things about higher dimensions without a lot of additional information.

The answer is in fact tied into dimensionality. In the 2D example, you can cover the whole space with 1,000,000 points. In 3D to do the same, you need 1,000,000,000. Beyond that the numbers rapidly become completely infeasible.

Comment: Re:The biggest problem is fluid dynamics. (Score 1) 58

Sure, it's an expensive toy - far more than *I* would be willing to pay certainly - but it squirts plastic out of a nozzle to make weak, crude plastic "toys". Arguably useful, especially when you're $4k/pound away from the nearest general store, but not remotely in the same league as the professional-grade printers working in laser-cured resin, sintered titanium, high temperature ceramics, etc.

Stratasys are the single largest 3D printer company and they sell pretty mich exclusively to businesses. I.e. they're selling them to people who do stuff for money, and only that. That makes them "professional grade" by definition.

The other ones you mention are much slower to run and much more expensive to boot. Not to mention that the resolution/strength is overkill for many applications. Part of being a professional is knowing how to make the right trade-offs and select the correct tool for the job.

You also missed out the starch powder printers which are even weaker than the FDM ones. Another professional tool due to the expense.

Comment: Re:In IT, remember to wash your hands (Score 1) 153

by serviscope_minor (#48625861) Attached to: In IT, Beware of Fad Versus Functional

Minivans are what happens when you take a car and stretch it into another vehicle.

Nope. The Nissan Serena was about the same size as a saloon car on the ground. It was nothing at all like a stretched car. In fact it looked more like a van adapted to partial passenger use.

Minivans get crap mileage

I looked at a few CUVs online. They get similar mileage to minivans at the penalty of being able to hold fewer passengers in confort and haul less cargo.

and have crap handling.

Neither of them are race cars. My experience driving minivans is that they provide more than adequate handling for safe operation on normal roads when driven at an appropriate speed for the conditions.

Sure if you try to hammer round a tight curve well above the speed limit, you'll look like a fool at a much lower speed for a minivan than for a Bugatti.

If you like handling then nothing apart from a dedicated sports car will be adequate.

We don't know who it was that discovered water, but we're pretty sure that it wasn't a fish. -- Marshall McLuhan