# Path based SDRs (Dendrite Trees)

**URL:** <https://discourse.numenta.org/t/path-based-sdrs-dendrite-trees/1575>\
**Category:** Numenta Theory\
**Created:** [November 8, 2016, 8:47pm UTC](https://discourse.numenta.org/t/path-based-sdrs-dendrite-trees/1575 "2016-11-08T20:47:52Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Paul\_Lamb](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.numenta.org/paul_lamb/32/2725_2.png) [@Paul\_Lamb](https://discourse.numenta.org/u/Paul_Lamb)\
**Post date:** [February 23, 2018, 7:06pm UTC](https://discourse.numenta.org/t/path-based-sdrs-dendrite-trees/1575/4 "2018-02-23T19:06:47Z")

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Were you ever able to work out how to form something like retna using HTMs? The location factor of the semantic folding process I could never recreate efficiently myself (“snip-its are distributed over a two dimensional grid in such a way that snip-its with similar meaning are placed close to one another”). Because of this, the word SDRs that I am able to create encode semantics properly, but lack topology.

(BTW, reading the papers now)

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