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 > > <http://www.examsupport.ie>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 > >
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