Neuron based data structure – An implementation » cip-labs – PHP, MySQL and CMS Systems
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Interesting, but no need for biological motivation - packages like Neo4j model directed graphs a little better than this, I think - and a little more flexible. And since it’s not spread over php and a typical RDMS like MySQL it’s probably quite a bit faster to calculate eigenvectors et al with. Especially since you can query it with Gremlin…