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Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network?

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In article <fa3hbbhh2qld1tcf2v3c4f278s4b7kbmdd@4ax.com>,
The New Other Guy  <Newsgnus@gmail.com> wrote:
>On Mon, 8 Feb 2016 11:33:56 +0000, Ahem A Rivet's Shot <steveo@eircom.net>
>wrote:
>
>>On Mon, 8 Feb 2016 02:28:20 -0800 (PST)
>>Neo Fortune <serenity3043@gmail.com> wrote:
>>
>>> https://www.raspberrypi.org/
>>
>>	I recently read that the human brain holds around a petabyte of
>>data in some form. Given that the latest and greatest raspberry-pi has a
>>gigabyte of memory I would not expect it to be possible with less than a
>>million of them. Interconnections would be troublesome.
>
>Hell, you could do it with THREE, if you wanted to emulate a politician.

To be serious; the connect speed is the one where we do have
a chance. The very max interconnect speed is around 10kbit; usually
significantly less. There are also surprisingly large delays; neuron
signals take ~30 ms from your fingers to your brain, ~70 from your
toes.

With 10 billion neurons, times 1000 interconnects (which seems large)
times 10 kilobits (also large) we get 10E16 bits/second, or around
10000 trillion; or 10 petabits. This is an upper bound, I would guess
the real figure is in the thousands lower; some tens of terabits. This
is around what we can push, today, through a standard optical (G.652)
fiber. 

Not that we can acheive this bitrate all in one place. Nor can the
brain. But with around 100 100Gbit swithces and WDM, we can.

The endeavour would cost us on the order of 100 kilowatts.

The individual neurons seem to be around as capable as an apple ][; 
or somewhat less. There are 10 billion of them. Most are mostly idle most
of the time. If we take todays technology and implement 6502-style
computers we should be able to make them use ~10mA each, down in the
uA range when idle. 

10 billion times 5V times 10 mA should give us a few hundred megawatts.

That is currently way out of scope. Even idling at 100 uA they would
draw several megawatts.

But the comms is barely doable in ~4 19" racks.

-- mrr

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How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? Neo Fortune <serenity3043@gmail.com> - 2016-02-08 02:28 -0800
  Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? Ahem A Rivet's Shot <steveo@eircom.net> - 2016-02-08 11:33 +0000
    Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? The New Other Guy <Newsgnus@gmail.com> - 2016-02-08 04:43 -0800
      Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? Morten Reistad <first@last.name.invalid> - 2016-02-08 18:54 +0100
        Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? Anne & Lynn Wheeler <lynn@garlic.com> - 2016-02-08 13:01 -0800
      Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? "Charles Richmond" <numerist@aquaporin4.com> - 2016-02-08 14:23 -0600
        Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? jmfbahciv <See.above@aol.com> - 2016-02-09 14:21 +0000
          Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? Ahem A Rivet's Shot <steveo@eircom.net> - 2016-02-09 14:54 +0000
            Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? Neo Fortune <serenity3043@gmail.com> - 2016-02-10 01:21 -0800
          Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? "Hilo Black" <hbk897@gmail.com> - 2016-02-10 02:07 +1100
          Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? Walter Bushell <proto@panix.com> - 2016-02-14 09:55 -0500
            Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? Morten Reistad <first@last.name.invalid> - 2016-02-14 21:38 +0100
              Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? jmfbahciv <See.above@aol.com> - 2016-02-15 14:14 +0000
                Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? "Rod Speed" <rod.speed.aaa@gmail.com> - 2016-02-16 05:14 +1100
            Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? jmfbahciv <See.above@aol.com> - 2016-02-15 14:14 +0000
    Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? "Charles Richmond" <numerist@aquaporin4.com> - 2016-02-08 14:22 -0600
      Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? Ahem A Rivet's Shot <steveo@eircom.net> - 2016-02-08 21:39 +0000
        Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? "Osmium" <r124c4u102@comcast.net> - 2016-02-08 16:43 -0600
          Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? jmfbahciv <See.above@aol.com> - 2016-02-09 14:21 +0000
            Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? "J. Clarke" <j.clarke.873638@gmail.com> - 2016-02-09 19:12 -0500
              Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? jmfbahciv <See.above@aol.com> - 2016-02-10 12:46 +0000
              Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? Roberto Waltman <usenet@rwaltman.com> - 2016-02-15 00:49 -0500
  Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? Stephen Wolstenholme <steve@easynn.com> - 2016-02-08 12:54 +0000
    Re: How Many Raspberry PI's Would It Take To Emulate The Human Brain's Neural Network? Mike Spencer <mds@bogus.nodomain.nowhere> - 2016-02-08 15:31 -0400

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