Dear Fergal, In my view, this CLA model is located between implementation of the functions of memory and recognition. The brain performs other functions such as planning, reasoning. Probably relevant external programs will be added to the model later. The brain generates the text for explanation his actions or for conscious reasoning. Various concepts of the language (text) have a semantic hierarchy that can be placed within one field of cortex. This hierarchy does not require a structural model hierarchy as recognition.
In my view, this CLA model can store and reproduce (predict) the time sequence due to the temporal order and due to the time scale between the levels of the hierarchy. First means that the time classifier will look for the best match (maximum correlation) for more than one time cycle. Second means that you do lossy compression information when going from the lower layer to the upper layer. Of course, the loss of information is a schematic taking into account a lower storage layer. I think, more clear division of tasks and concepts will help the progress. Regards, Ivan On Date: Mon, 9 Sep 2013 22:40:16 +0100 From: Fergal Byrne <[email protected]> To: "NuPIC general mailing list." <[email protected]> Subject: Re: [nupic-dev] Inter-layer plumbing Message-ID: <cad2q5yek9b7spzhy-vbrgmv++h3q+8aaedvevqogzayqqpn...@mail.gmail.com> Content-Type: text/plain; charset="windows-1252" Hi Chetan, At the risk of using either the word "artefact" or "hack," we need to recognise that we're still working on the single-layer of a single region which is trying to predict a single value a single number of steps ahead. We haven't figured out universal ways of feeding this guy its data, and we're avoiding for now the whole question of how the different layers work and how to connect CLA's in a hierarchy. So for now, we have encoders, classifiers, and swarming to help us put together the missing infrastructure around our tiny 1mm squared layer of a region. I'm really interested in the idea of a neurologically justified design involving adaptive encoders which simultaneously incorporate encoding parameters, classification and swarming in a single structure. This design will likely have an analogue with inter-layer and inter-region plumbing. If that's correct, it'll hopefully give us the initial machinery for building hierarchies. There are all sorts of computations humans do which require a hierarchy to even begin to figure out. Regards, Fergal Byrne
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