The HTM Spatial Pooler: a neocortical algorithm for online sparse distributed coding

[Bitking]

I can’t answer on the best numbers for getting HTM simulations to work.
As far as the actual biology I have found some papers that are fairly clear on what to expect from mini-columns.

Project : Full-layer V1 using HTM insights

I have been conversing with @gmirey for some time on this general topic. We endeavored to get a sense of the scale of the relative dimensional quantities of the temporal layer, inputs and cell/column spacing, number and range of the connections. You know - the basic facts of making a realistic model. Some of what was discussed was what is known about reach and density of the dendritic arbor in the “input” layer. We established the key factors would be: what is the spacing of the ascending cort…

The mini-column and rising axon clusters are on 30 um centers and the dendrites reach out 250 um in any direction. that makes the “local neighborhood” for a mini-column about 225 mini-columns.

For a much longer post with more intuitive graphics see this post.

HTM Mini-Columns into Hexagonal Grids!

Or at least some wild conjectures to provoke thought! This post assumes that you are familiar with basic HTM theory and are conversant with the concepts of SDRs and HTM minicolumns. May I be so bold: [HTM%20and%20GRIDS] First - let’s be clear what I am and am not talking about. This is about cells that work by forming regular hexagonal grid structures and are not necessarily the same thing as the “grid cells” that are coding some spatial aspect of the surrounding environment. These grid-fo…

Note this post offers a very different view of making a spatial pooler. In the hex-grid view the hex coding replaces the SP part of HTM theory. The advantage is that individual hex-grids combine to describe a pattern that can be much larger than could be described with a single SP. Keep in mind that this is NOT standard HTM and if you play with this you are on your own as nobody but me is actually doing anything with this. My C/perl code will be utterly unhelpful to any project you are likely to be considering as it is a neural simulator model and not a computational model.