Awesome explanation Fergal :) So, for 128 bit scalar encoding atleast required 500 columns to see the stable SDR, sequence learning. For example, if i have large (i.e 10k) bit length of encoded scalar values, 2048 columns enough to get the above effects?
Thanks Ramesh Ganesan On Fri, Aug 9, 2013 at 6:20 AM, Doug King <[email protected]> wrote: > Very nice, concise description of the Spatial Pooler. Thanks Fergal. > > > On Wed, Aug 7, 2013 at 8:32 AM, Fergal Byrne > <[email protected]>wrote: > >> >> Hi Francisco, >> >> The Spatial Pooler is an artefact of NuPIC; it simulates the way a >> layer of columns becomes activated by feedforward inputs. In essence, the >> algorithm is: >> >> Get all columns to check their feedforward dendrite and generate an >> activation score. >> Pick the top 2% of columns based on activation score and activate them. >> Update the permanences on the feedforward dendrites. >> >> In the neocortex, the columns do this themselves, and they pick the top >> 2% (may vary) by higher-score columns inhibiting nearby lower-score >> columns. They also update their own synapses themselves. >> >> So the SP is simulating the inter-region communication as well as the >> single-region sensory communication. >> >> Regards, >> >> Fergal Byrne >> >> >> _______________________________________________ >> 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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