# HTM School Episode 7: Spatial Pooling Input Space & Connections

**URL:** <https://discourse.numenta.org/t/htm-school-episode-7-spatial-pooling-input-space-connections/1089>\
**Category:** YouTube\
**Tags:** spatial-pooling\
**Created:** [July 22, 2016, 2:43pm UTC](https://discourse.numenta.org/t/htm-school-episode-7-spatial-pooling-input-space-connections/1089 "2016-07-22T14:43:51Z")\
**Posts on this page:** 1\
**Showing post:** 15

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**Author:** ![rhyolight](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.numenta.org/rhyolight/32/3922_2.png) [@rhyolight](https://discourse.numenta.org/u/rhyolight)\
**Post date:** [July 22, 2016, 6:48pm UTC](https://discourse.numenta.org/t/htm-school-episode-7-spatial-pooling-input-space-connections/1089/15 "2016-07-22T18:48:57Z")

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> [@gabgoh](#):
>
> Thanks for the informative video - I’m getting a clearer idea of what HTMs are. I’m here from the machinelearning reddit.

You’re welcome, and also welcome to this forum. I’m happy to see someone from the ML subreddit. HTM posts are usually not well-received there.

> [@gabgoh](#):
>
> This random mapping reminds me of the Johnson Lindenstrauss lemma

You might also note that [SDR unions are comparable to Bloom filters](https://discourse.numenta.org/t/htm-school-episode-4-sdr-sets-unions/455/12).

It seems the brain is several million years ahead of us when it comes to math / number / set theory. 🙂

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