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August 01, 2006

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digital photo frame

Flocking birds fight cybercrime: A researcher at Paypay described and demonstrated an approach for finding needles of fraud in a haystack of transaction data by using an approach called particle swarm optimization. The first step (which is proprietary and wasn't discussed) is determining what fraud smells like. The second step is, roughly speaking, to turn a flock of virtual birds loose on your data and have them all look for bad-smelling regions. The trick he showed was having each bird respond to a mix of "social" (look where the flock has had the most success) and "individual" (look where I've had the most success) motivation, resulting in collective behavior that was pretty good at finding global peaks while avoiding getting trapped on top of local hills.

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