Not to worry Matt, and thanks for the offer Fergal but I’d rather hear your input than take your place! :)
Pete On 13 Nov 2013, at 00:39, Matthew Taylor <[email protected]> wrote: > 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 _______________________________________________ nupic mailing list [email protected] http://lists.numenta.org/mailman/listinfo/nupic_lists.numenta.org
