I would phrase it as "feedback is fundamental to biological intelligence".
--Subutai On Wed, Mar 5, 2014 at 3:08 PM, Ian Danforth <[email protected]>wrote: > Using the same weights going up and coming down isn't biological but > reconstruction in general is fundamental to biological intelligence. > > Ian > On Mar 5, 2014 10:20 AM, "Subutai Ahmad" <[email protected]> wrote: > >> >> Yes, that is what the old reconstruction algorithm tried to do. I looked >> around and found an old writeup of it which I've attached here. The >> language in it is outdated, but perhaps still helpful? Section 3 (top down >> compute) is the most relevant. >> >> Historically, we stopped using it in nupic because the classifier based >> approach worked much better in the OPF for prediction. >> >> Also, this algorithm is not at all biologically realistic. However, it >> may still be quite useful! >> >> --Subutai >> >> >> On Wed, Mar 5, 2014 at 9:49 AM, Marek Otahal <[email protected]>wrote: >> >>> If by the 'old reconstruction' we mean that each block (SP, TP, encoder) >>> can process in reverse direction (top-down)? then YES for me. I'd have lots >>> usages. >>> I'd be willing to mentor this task in SoN. >>> >>> >>> On Thu, Feb 27, 2014 at 6:49 PM, Chetan Surpur <[email protected]>wrote: >>> >>>> In order to use CEPT SDRs with both the spatial pooler and the temporal >>>> pooler (rather than just the TP directly), we will need some form of >>>> reconstruction. This will allow us to bring back the output of the TP into >>>> the original CEPT SDR space. >>>> >>>> This reasoning applies to any predetermined SDRs that you want to feed >>>> into a region and get a prediction for. >>>> On Feb 27, 2014 9:37 AM, "Matthew Taylor" <[email protected]> wrote: >>>> >>>>> Is the old reconstruction algorithm a good idea and should we bring >>>>> back a working implementation in NuPIC? This is a meaty topic that >>>>> Subutai and Ian have started on Github[1][2]. We'd like to have this >>>>> conversation here on the mailing list before we create further tickets >>>>> and take action. >>>>> >>>>> Please chime in if you have an opinion. >>>>> >>>>> [1] https://github.com/numenta/nupic/pull/421#issuecomment-30059730 >>>>> [2] https://github.com/numenta/nupic/issues/683 >>>>> >>>>> --------- >>>>> Matt Taylor >>>>> OS Community Flag-Bearer >>>>> Numenta >>>>> >>>>> _______________________________________________ >>>>> nupic mailing list >>>>> [email protected] >>>>> http://lists.numenta.org/mailman/listinfo/nupic_lists.numenta.org >>>>> >>>> >>>> _______________________________________________ >>>> nupic mailing list >>>> [email protected] >>>> http://lists.numenta.org/mailman/listinfo/nupic_lists.numenta.org >>>> >>>> >>> >>> >>> -- >>> Marek Otahal :o) >>> >>> _______________________________________________ >>> nupic mailing list >>> [email protected] >>> http://lists.numenta.org/mailman/listinfo/nupic_lists.numenta.org >>> >>> >> >> _______________________________________________ >> nupic mailing list >> [email protected] >> http://lists.numenta.org/mailman/listinfo/nupic_lists.numenta.org >> >> > _______________________________________________ > nupic mailing list > [email protected] > http://lists.numenta.org/mailman/listinfo/nupic_lists.numenta.org > >
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