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At the Libraries: Your Weekly Round-Up

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Every Wednesday, Miss Kathleen provides links to a variety of library-related items. If there's something fun going on in your local library this week, leave us a comment!

Last week the Old Spice Guy was all over YouTube, responding to tweets in some pretty funny short videos. And, of course, we had some about libraries! Check out the hilarity here:

And see a library spoof that's definitely worth your time:

Also last week, in this very column, I told you about Percy Jackson Adidas that could be yours. But maybe owning the sneakers isn't enough -- maybe you really want to BE a half-blood. Well guess what? There's a summer camp where you can pretend you are!
Upset about budget cuts at your local library? Here's a nice way to get a local government's attention -- a Read In as a protest! If you go to one, please send me pictures!
And now, for our feel-good story for this week, involving a seven-year-old boy, a lemonade stand, and a dream. A dream of a library that has Mo Willems books aplenty. Gavin was inspired to read the Elephant and Piggie books by his former librarian in North Carolina. Reader, I was that librarian, and I couldn't be prouder of Gavin! His new library is lucky to have such a family as their patrons!

Bookmobiles are always a popular topic for librarians. Here is one proud library system, Tulsa City-County, and their Bookmobile website. Click through for Bookmobile photos past, present, and .. future?
People often use libraries as platforms to advertise their beliefs. Two organizations in New Hampshire did just that, putting bookmarks in thousands of books. Um, without asking permission. The bookmarks, once discovered, were removed, but a lot more people probably know about The School Sucks Project and Freedomain Radio now.
Have you ever wondered, how on earth could someone believe that? Sometimes all it takes to understand another person's opinion is a good conversation, but how often does that happen? Well, the aim of Human Library is to foster such understanding: Users can chat with "people on loan": volunteers of diverse ages, backgrounds, and beliefs. Kind of fascinating, huh? I'd love to do it in my library! Would you sign up?
A lot of folks decide to read a book based on the quotes they see on a book's cover, usually by another author. These 'blurbs' are commonplace in publishing, but do they really influence book buying? And can they sometimes be guilty of hyperbole? Yes and yes! Check out Salon's coverage of how a recent, possibly exaggerated, blurb inspired a competition to outdo the blurber.
Kids say the darnedest things! Here's one conversation with one kid who has two wacky things to say:

Boy: Are you Asian?
Me: Yes.
Boy: I could tell.
Me: How?
Boy: Your eyes.
Me: My eyes? Not my hair? Or my fingernails? Or my ears?
Boy: Your eyes. Because we're Asian too, see. [Solemnly lifts up bangs to show me his eyes.] We desperately really need the book Strega Nona. I noticed that it's supposed to be available at this library, but it's not on the shelf. I assume someone didn't put it back. Kids these days. [Rolls eyes.]
Me: old are you?
Boy: 7.

See you all next week! As always hit me with suggestions via email or in the comments below!

Email Miss Kathleen to let her know what your library is up to— See previous installments of At the Libraries here.


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iStock // Ekaterina Minaeva
Man Buys Two Metric Tons of LEGO Bricks; Sorts Them Via Machine Learning
May 21, 2017
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iStock // Ekaterina Minaeva

Jacques Mattheij made a small, but awesome, mistake. He went on eBay one evening and bid on a bunch of bulk LEGO brick auctions, then went to sleep. Upon waking, he discovered that he was the high bidder on many, and was now the proud owner of two tons of LEGO bricks. (This is about 4400 pounds.) He wrote, "[L]esson 1: if you win almost all bids you are bidding too high."

Mattheij had noticed that bulk, unsorted bricks sell for something like €10/kilogram, whereas sets are roughly €40/kg and rare parts go for up to €100/kg. Much of the value of the bricks is in their sorting. If he could reduce the entropy of these bins of unsorted bricks, he could make a tidy profit. While many people do this work by hand, the problem is enormous—just the kind of challenge for a computer. Mattheij writes:

There are 38000+ shapes and there are 100+ possible shades of color (you can roughly tell how old someone is by asking them what lego colors they remember from their youth).

In the following months, Mattheij built a proof-of-concept sorting system using, of course, LEGO. He broke the problem down into a series of sub-problems (including "feeding LEGO reliably from a hopper is surprisingly hard," one of those facts of nature that will stymie even the best system design). After tinkering with the prototype at length, he expanded the system to a surprisingly complex system of conveyer belts (powered by a home treadmill), various pieces of cabinetry, and "copious quantities of crazy glue."

Here's a video showing the current system running at low speed:

The key part of the system was running the bricks past a camera paired with a computer running a neural net-based image classifier. That allows the computer (when sufficiently trained on brick images) to recognize bricks and thus categorize them by color, shape, or other parameters. Remember that as bricks pass by, they can be in any orientation, can be dirty, can even be stuck to other pieces. So having a flexible software system is key to recognizing—in a fraction of a second—what a given brick is, in order to sort it out. When a match is found, a jet of compressed air pops the piece off the conveyer belt and into a waiting bin.

After much experimentation, Mattheij rewrote the software (several times in fact) to accomplish a variety of basic tasks. At its core, the system takes images from a webcam and feeds them to a neural network to do the classification. Of course, the neural net needs to be "trained" by showing it lots of images, and telling it what those images represent. Mattheij's breakthrough was allowing the machine to effectively train itself, with guidance: Running pieces through allows the system to take its own photos, make a guess, and build on that guess. As long as Mattheij corrects the incorrect guesses, he ends up with a decent (and self-reinforcing) corpus of training data. As the machine continues running, it can rack up more training, allowing it to recognize a broad variety of pieces on the fly.

Here's another video, focusing on how the pieces move on conveyer belts (running at slow speed so puny humans can follow). You can also see the air jets in action:

In an email interview, Mattheij told Mental Floss that the system currently sorts LEGO bricks into more than 50 categories. It can also be run in a color-sorting mode to bin the parts across 12 color groups. (Thus at present you'd likely do a two-pass sort on the bricks: once for shape, then a separate pass for color.) He continues to refine the system, with a focus on making its recognition abilities faster. At some point down the line, he plans to make the software portion open source. You're on your own as far as building conveyer belts, bins, and so forth.

Check out Mattheij's writeup in two parts for more information. It starts with an overview of the story, followed up with a deep dive on the software. He's also tweeting about the project (among other things). And if you look around a bit, you'll find bulk LEGO brick auctions online—it's definitely a thing!

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Name the Author Based on the Character
May 23, 2017
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