Slashdot Mirror
Extreme Complexity of Scientific Data Driving New Math Techniques
An anonymous reader writes "According to Wired, 'Today's big data is noisy, unstructured, and dynamic rather than static. It may also be corrupted or incomplete. ... researchers need new mathematical tools in order to glean useful information from the data sets. "Either you need a more sophisticated way to translate it into vectors, or you need to come up with a more generalized way of analyzing it," [Mathematician Jesse Johnson] said. One such new math tool is described later: "... a mathematician at Stanford University, and his then-postdoc ... were fiddling with a badly mangled image on his computer ... They were trying to find a method for improving fuzzy images, such as the ones generated by MRIs when there is insufficient time to complete a scan. On a hunch, Candes applied an algorithm designed to clean up fuzzy images, expecting to see a slight improvement. What appeared on his computer screen instead was a perfectly rendered image. Candes compares the unlikeliness of the result to being given just the first three digits of a 10-digit bank account number, and correctly guessing the remaining seven digits. But it wasn't a fluke. The same thing happened when he applied the same technique to other incomplete images. The key to the technique's success is a concept known as sparsity, which usually denotes an image's complexity, or lack thereof. It's a mathematical version of Occam's razor: While there may be millions of possible reconstructions for a fuzzy, ill-defined image, the simplest (sparsest) version is probably the best fit. Out of this serendipitous discovery, compressed sensing was born.'"
For fuck's sake.
These techniques of dealing with incomplete and unstructured data have existed for decades.
AI researches hyping absolutely everything about their field to get some funding is starting to get on my nerves.
"They were trying to find a method for improving fuzzy images, such as the ones generated by MRIs when there is insufficient time to complete a scan. On a hunch, Candes applied an algorithm designed to clean up fuzzy images,[...]"
Wow! That would be the last thing I thought of in that situation...
Support microSD: in a post 9/11 world, it is unwise to carry your data on media that you cannot comfortably swallow.
I like some of the more subtle details in the title and summary: new math "techniques", "researchers need new mathematical tools", etc.
I find it hard to believe that our sciences are driving the math fields, as mature and well-developed as the math community is. But it is true that existing knowledge and tools from mathematics drive huge advances in the sciences when they are brought to bear. The sad truth is that scientists just don't play terribly well with others (maybe no one does): interdisciplinary work is rare and difficult, and so we end up re-inventing the wheel over and over again. The reality is that the "wheel" being created by the biologist in order to interpret their data is a poor copy of the one already understood by the physicist across campus.
What can we do about this? I'm not sure, but I think it's safe to say that our greatest scientific advances in the next few decades will be the result of novel collaborations, and not novel math or (strictly speaking) novel science.
Yeah, my doctor couldn't see enough detail in my head x-ray, so he used Photoshop's "content-aware fill" to fix it, and now apparently I need surgery to remove the 3rd half of my brain. I get to keep the 2 extra eyeballs, though.
(actually, I really really want to see that applied to medical x-rays)
my, your, his/her/its, our, your, their
I'm, you're, he's/she's/it's, we're, you're, they're
OF course it works. "Zoom! Enhance!" If TV hasn't taught me that "enhance" works reliably, then TV has taught me nothing.
Socialism: a lie told by totalitarians and believed by fools.
4 years ago, Slashdot ran this exact same story http://science.slashdot.org/story/10/03/02/0242224/recovering-data-from-noise about Wired running this exact same story: http://www.wired.com/magazine/2010/02/ff_algorithm/all/1
The whole article is just a sales job:
The first place to look when people make such claims is at their publications, neither Gunnar Carlsson nor Simon DeDeo have significant publications that show that their approach works on real data or standard test sets. The statements in the article that these kinds of approaches are new are also bogus (I don't know whether they are deceptive or ignorant).
Lastly, from a Stanford math professor, I would expect better citation statistics overall; I don't know what's going on there.
http://scholar.google.de/citations?user=nCGwiu0AAAAJ&hl=en
http://scholar.google.de/scholar?as_ylo=2009&q=author:%22gunnar+carlsson%22&hl=en&as_sdt=0,5