Cheers Scott, Francisco, the SP is an artefact in the sense that it is a critical component of NuPIC which replaces the functionality in the neocortex which causes an SDR of columns to activate in response to feedforward input (which may not necessarily be SDR in character). (ie it's not an artefact in the sense of your appendix!).
This is done in the SP by scoring, choosing the top 2%, updating dendrites, and boosting (thanks Scott). This enforces an SDR of activated columns, regardless of the sparsity of the input. It also develops the learning of input patterns mapped to activation patterns. The idea is that the SP "normalises" the input, so that the "top view" of every region looks similar - a sequence of SDR's. As Scott says, this "top view" will give no clue as to the character or size of the feedforward input patterns. Regards, Fergal Byrne
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