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AdamMarblestone's profile
Adam Marblestone
Adam Marblestone
Adam Marblestone
@AdamMarblestone

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Adam Marblestone

@AdamMarblestone

Technologist, Scientist

adammarblestone.org
Joined February 2009

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    1. Tim Vogels‏ @TPVogels Jan 10
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      Well, using only neuron-specific gating, memory capacity rises to nearly 1.2 (for 200 contexts), almost an order of magnitude higher than the standard Hopfield network (green arrow head). This depends on the number of subnetworks (s) and their relative size (a).pic.twitter.com/5eTmz3aGkJ

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    2. Tim Vogels‏ @TPVogels Jan 10
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      For TaSS gating, we have to jump through a few hoops, to find the synapses that have a net harmful effect for recalling a given set of memories in the active context, and shut those synapses UP.pic.twitter.com/BoYjwsukVv

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    3. Tim Vogels‏ @TPVogels Jan 10
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      TaSS protects memories from interference from irrelevant memories, allowing for a capacity of up to two orders of magnitude higher than the standard Hopfield model (green arrow head). Dang!pic.twitter.com/VxV8UgPJOn

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    4. Tim Vogels‏ @TPVogels Jan 10
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      Both types of contextual control require extra neurons, of course! So we calculate how many extra neurons are needed to encode context for each scheme, & determine if the memory gains we see are “real” and feasible. Check the paper for details, but we still come out on top. Phew!pic.twitter.com/fr7rnbltzN

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    5. Tim Vogels‏ @TPVogels Jan 10
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      It should be said, TaSS is a real pain in the (t)ASS to get ‘right’, so how would neurons do it?pic.twitter.com/ElZTDB0ziR

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    6. Tim Vogels‏ @TPVogels Jan 10
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      That’s the gist of it. But wait, there is more: Context also controls the memory stability of patterns, enabling dynamic control of memory accessibility. We show this, and suggest it may explain some memory disorders in which memories are not forgotten, but become inaccessible.pic.twitter.com/jzsRuFTUQV

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    7. Tim Vogels‏ @TPVogels Jan 10
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      And then we also looked at how our model can aid in continual learning, can implement arbitrary and overlapping contexts, and can encode distributions over memory strengths, to enable flexible memory storage and recall. In short, context makes everything better. Check it out!pic.twitter.com/LuIBR4sL3n

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    8. Tim Vogels‏ @TPVogels Jan 10
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      So, in summary our model shows: (i) how gating and inhibition can contribute to memory, (ii) how memory access/availability dynamically change over time, and (iii) how context representations, such as those observed in hippocampus and PFC, may interact with and control memory.pic.twitter.com/TZXLSFlQct

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    9. Tim Vogels‏ @TPVogels Jan 10
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      Obvs there is other work out there, like context-dependent gating in deep learning by Masse and colleagues, https://www.pnas.org/content/115/44/E10467.short …. We’re also anxiously waiting for @BOlveczky’s new stuff, and @sjo09, @ratecoding, @Franklandlab (among others) have related work. Stay tuned!

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    10. Tim Vogels‏ @TPVogels Jan 10
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      In any case, we hope to provide a framework for the cognitive control of memory, efficient memory search, and its interaction with decision making. The end. Check more work http://vogelslab.org  Thanks for flying Neurovogels, we appreciate your business. Please come back soon.

      4 replies 0 retweets 19 likes
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      Adam Marblestone‏ @AdamMarblestone Jan 10
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      Replying to @TPVogels @biorxiv and

      Very cool and memory-systems-for-AI-relevant! Your synaptic gating might also be used to implement some "symbolic variable binding" sorts of things:https://www.frontiersin.org/articles/10.3389/fncom.2012.00073/full …

      2:33 PM - 10 Jan 2020
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      • Tim Vogels Bill Podlaski Patrick House Francisco Sacadura Sheena Josselyn
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