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 language in it is outdated, but perhaps still helpful?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 > >
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