In the HTM model biologically this reconstruction feedback would go to cortical neural level 6.
Bert op 06-03-14 00:08, Ian Danforth schreef:
Using the same weights going up and coming down isn't biological but reconstruction in general is fundamental to biological intelligence.IanOn Mar 5, 2014 10:20 AM, "Subutai Ahmad" <[email protected] <mailto:[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 The language in it is outdated, but perhaps still helpful?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] <mailto:[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] <mailto:[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] <mailto:[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
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