Hi Kevin, I did some simple experiments with swarming and correlated inputs [1]. One thing to note is that temporal correlation / sequence structure is also very important. That is independent from spatial correlation.
--Subutai [1] https://github.com/subutai/nupic.subutai/tree/master/swarm_examples On Thu, Sep 25, 2014 at 11:33 AM, Archie, Kevin <[email protected]> wrote: > John, > > I think this is an example of an important general case. On both > statistical and biological grounds I suspect you should decorrelate your > inputs before producing SDRs from them. I haven't tried this myself (have > hardly done anything with NuPIC) but I'm wondering if anyone has done > substantial preprocessing to compensate for the statistics of the inputs. > Even better would be if anyone has done a comparison of feeding NuPIC > decorrelated vs. direct sensor inputs--or a theoretical argument that > decorrelating the inputs is unnecessary or unwise. > > - Kevin > > ------------------------------ > *From:* nupic [[email protected]] on behalf of John > Blackburn [[email protected]] > *Sent:* Tuesday, September 23, 2014 7:27 AM > *To:* Archie, Kevin > *Subject:* Re: Which NuPIC tutorial do you want to see next? > > Hi Matthew, > > Rather self serving, but I would love to see a tutorial related to the > "bridge" simulation I've been trying to do or similar. I have not got NuPIC > to work yet despite some effort. Basically the difference with Hotgym is we > have 18 sensors, 10 temperature and 8 tilt (ie strain) and we want to make > predictions on all taking account of cross-correlations. So a tutorial with > multiple correlated time series would be great! > > At NPL we monitored a bridge every 5 minutes for 3 years recording all 18 > sensors so I think this data would be a great showcase for a real-world > NuPIC example. We also perturbed the bridge at known times (cutting > supports, adding weights etc) so we know when the anomalies should appear. > > John. > > On Mon, Sep 22, 2014 at 4:57 PM, Matthew Taylor <[email protected]> wrote: > >> I have more tutorials planned, but I'd like some help deciding which >> to do first. Please answer this 1-question poll: >> >> >> https://docs.google.com/forms/d/1GBYWg_-LIaYmOz9EJ5LbFo6N2ot1xv9AA22gaNdENs0/viewform?usp=send_form >> >> Thanks, >> --------- >> Matt Taylor >> OS Community Flag-Bearer >> Numenta >> >> > > ------------------------------ > > The material in this message is private and may contain Protected > Healthcare Information (PHI). If you are not the intended recipient, be > advised that any unauthorized use, disclosure, copying or the taking of any > action in reliance on the contents of this information is strictly > prohibited. If you have received this email in error, please immediately > notify the sender via telephone or return mail. >
