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How Radix trees made blocking IPs 5000 times faster
Learn what Radix trees are and how they helped Sqreen improve their automated security protections. Learn the difference between radix tree and binary tree.
programming  algorithm 
21 hours ago by lenciel
Facebook's '10 Year Challenge' Is Just a Harmless Meme—Right? | WIRED
If you use social media, you've probably noticed a trend across Facebook, Instagram, and Twitter of people posting their then-and-now profile pictures, mostly from 10 years ago and this year.
Kate O'Neill is the founder of KO Insights and the author of Tech Humanist and Pixels and Place: Connecting Human Experience Across Physical and Digital Spaces.
Instead of joining in, I posted the following semi-sarcastic tweet...
My flippant tweet began to pick up traction. My intent wasn't to claim that the meme is inherently dangerous. But I knew the facial recognition scenario was broadly plausible and indicative of a trend that people should be aware of. It’s worth considering the depth and breadth of the personal data we share without reservations.
Of those who were critical of my thesis, many argued that the pictures were already available anyway. The most common rebuttal was: “That data is already available. Facebook's already got all the profile pictures.”
Of course they do. In various versions of the meme, people were instructed to post their first profile picture alongside their current profile picture, or a picture from 10 years ago alongside their current profile picture. So, yes: These profile pictures exist, they’ve got upload time stamps, many people have a lot of them, and for the most part they’re publicly accessible.
But let's play out this idea.
facebook  photography  facial_recognition  training  algorithm  privacy  security  op-ed  meme 
yesterday by rgl7194
Daring Fireball: Facebook's '10 Year Challenge' -- Harmless Meme, or Training for Age-Progressive Facial Recognition?
Kate O’Neill, writing for Wired:
But let’s play out this idea.
Imagine that you wanted to train a facial recognition algorithm on age-related characteristics and, more specifically, on age progression (e.g., how people are likely to look as they get older). Ideally, you’d want a broad and rigorous dataset with lots of people’s pictures. It would help if you knew they were taken a fixed number of years apart — say, 10 years.
Sure, you could mine Facebook for profile pictures and look at posting dates or EXIF data. But that whole set of profile pictures could end up generating a lot of useless noise. People don’t reliably upload pictures in chronological order, and it’s not uncommon for users to post pictures of something other than themselves as a profile picture. A quick glance through my Facebook friends’ profile pictures shows a friend’s dog who just died, several cartoons, word images, abstract patterns, and more.
In other words, it would help if you had a clean, simple, helpfully labeled set of then-and-now photos.
I think it’s very fair to say we should all assume the worst with Facebook all the time now. That’s why I posted my 10-year challenge to Twitter instead of Instagram.
facebook  photography  facial_recognition  training  algorithm  privacy  security  daring_fireball  meme 
yesterday by rgl7194
Fourier Transforms
An Interactive Introduction to Fourier Transforms!
math  algorithm  data-virtualization 
2 days ago by lenciel

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