Wow, I didn't realize there was a limit! Sorry guys, maybe it's time to think about another technology for video chats. --------- Matt Taylor OS Community Flag-Bearer Numenta
On Tue, Nov 12, 2013 at 4:25 PM, Jeff Fohl <[email protected]> wrote: > If there is someone who wants to get on, I can drop off to make room. > > - Jeff > > > On Tue, Nov 12, 2013 at 4:16 PM, Fergal Byrne <[email protected]> > wrote: >> >> I'm getting the same. Google hangouts says the hangout is full. >> >> >> >> On Wed, Nov 13, 2013 at 12:07 AM, Pete Cumberland <[email protected]> >> wrote: >>> >>> The Hangout is full it seems, so I’ll have to stick to the YouTube feed. >>> >>> Thanks for doing this! >>> >>> Pete >>> >>> >>> >>> >>> >>> On 12 Nov 2013, at 23:53, Matthew Taylor <[email protected]> wrote: >>> >>> > Hangout: https://plus.google.com/hangouts/_/7ecpjh57bqs47e27f1hqkkcdps >>> > YouTube: http://youtu.be/rSpYyUN4iP0 >>> > --------- >>> > Matt Taylor >>> > OS Community Flag-Bearer >>> > Numenta >>> > >>> > >>> > On Sat, Nov 9, 2013 at 5:21 PM, Matthew Taylor <[email protected]> >>> > wrote: >>> >> At this office hour[1], Subutai is going to lead us through the "CLA >>> >> Quiz". We'll focus on the spatial pooler. The questions are below. >>> >> Bring your brains! >>> >> >>> >> **Spatial Pooler / SDR Questions** >>> >> >>> >> 0) Is an untrained CLA spatial pooler just a “random hash” (random >>> >> mapping from input to output vector)? Why or why not? What happens to >>> >> the output of the spatial pooler if you randomly change one bit in the >>> >> input. >>> >> >>> >> 1) Can you do spatial pooling with small numbers? For example, is it >>> >> reasonable to have an SP with 20 columns? If not, why are large >>> >> numbers important in SDR's? >>> >> >>> >> a) What's the difference between picking "5 columns out of 50" vs "50 >>> >> out of 500"? Both have 10% sparsity. >>> >> >>> >> b) What's the difference between picking "50 out of 100" vs "50 out of >>> >> 1000"? Both will output 50 1's. >>> >> >>> >> 2) Suppose the input vector (input to the SP) is 10,000 bits long, >>> >> with 5% sparsity. What is the right value of coincInputPoolPct? How do >>> >> you figure this out? >>> >> >>> >> 3) How does the SDR representation of input A in isolation, and input >>> >> B in isolation, compare with the SDR representation of input A >>> >> overlapped with B? Alternatively, how does the representation of a >>> >> horizontal line and the representation of a vertical line compare with >>> >> the representation of a cross? >>> >> >>> >> 4) Suppose we have an input vector that is 10,000 bits long. Suppose >>> >> the spatial pooler has 500 columns, of which 50 are active at any >>> >> time. >>> >> >>> >> a) Can we distinguish many patterns, or a small number? Which >>> >> patterns are likely to be confused? >>> >> >>> >> b) What happens to the SDR representation if we add noise to the >>> >> patterns? >>> >> >>> >> c) What happens if we add occlusions? >>> >> >>> >> 5) What are disadvantages of SDR's? >>> >> >>> >> 6) How does online learning happen in the SP? >>> >> >>> >> --------- >>> >> Matt Taylor >>> >> OS Community Flag-Bearer >>> >> Numenta >>> >> >>> >> [1] >>> >> https://plus.google.com/b/100642636108337517466/events/crmrf6k58s77hlgk4v30bll8hp8 >>> > >>> > _______________________________________________ >>> > 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 >> >> >> >> >> -- >> >> Fergal Byrne >> >> Brenter IT >> [email protected] +353 83 4214179 >> Formerly of Adnet [email protected] http://www.adnet.ie >> >> _______________________________________________ >> 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
