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IBM Working on Brain-Rivaling Computer
Obdurate writes "The first supercomputers to approach and even surpass the processing power
of the human brain are to be built by IBM, under a $184M contract
announced by the US Government yesterday.
ASCI Purple and Blue Gene/L will be the fastest and most powerful machines built,
with a combined capacity equal to the 500 best of todays computers."
how do they measure the processing power of the human brain?
Anyone else notice that? Power4 is the current generation, and holds the 9th spot on the top-500 list with only 1280 processors!
I'm sure IBM is working hard on a new interconnect for this beast. Anyone know about the next-generation SP switch?
The press release also mentions that Purple will consist of "196 seperate computers" -- which works out to 64-processors per computer. Way to go IBM: the current Power4 systems are only to 32-way!
Neurons in adults: 2x10E9 to 5x10E9
Synapses in adults: 10E14, a few thousand per neuron
Neuron firings per second: max 2 Khz
The biggest challenge in comparing brain to supercomputer is the massive connectivity of brain, with 2000-5000 synapses per neuron.
The total processing speed of ASCII Purple sounds about right for number of neurons in brain times the maximum number of pulses per second per neuron.
Given there are 10E14 synapses, each one with at least a byte of synpatic weight associated with it, it would need memory of at least around a petabyte of memory, although synpase memory change speeds are probably not faster than tape, and I know of plenty of installations with a petabyte on tape.
But here is the kicker: Will those 100 teraflops be flops that can use thousands of inputs? Probably not. So I'd argue that to truly be as powerful as the human brain, you would need 100 petaflops of 1-2 input flops, with at least a petabyte tape system.
Hold on there!
Our brains are fine for huge linear calculations. Better than most calculators in fact.
Autistic savants....
Rain Main. That kind of thing.
There was a kid I knew in high school that could find cube roots for eight digit numbers nearly instantly but he couldn't recognize his brother's face in a picture.
My personal theory is this: Human brains are like a computer (about a million orders of mangitude more complex though). Most people have that all tied up in hardware dedicated to things like jobs, girl friends, football etc. etc.
John, my autistic friend in high school, hadn't dedicated the hardware to anything in particular, but he still had it available. He was lacking in a lot of things, but sheer processing power and memory he had in spades.
As a side story, another friend of mine in high school had epilepsy, and it kept getting worse. He eventually had brain surgery where they severed his corpus callosum. After that, he couldn't add single digit numbers if he closed his right eye. If he closed his left, he couldn't recognize faces. Just kind of shows how the brain works as a parallel system.