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I don't think that's it though – in recurrent neural networks, there is still a distinction between internal state (dynamic) and weights (static). Whereas, in

I don't think that's it though – in recurrent neural networks, there is still a distinction between internal state (dynamic) and weights (static). Whereas, in biological brains, the weights are updated continuously.

anon291 3y ago
There is also a distinction in the brain between long-term and short-term memories. It is not so beyond belief that the brain stores short-term memories into long-term memories in a separate process (Perhaps sleep, whose lack thereof we know is linked with memory recall issues). Recurrent neural networks 'learn' continuously by changing their weights (In effect) based upon the 'previous state'. There are papers showing that attention mechanisms in transformers basically provide a 'weight' update function so that models can 'learn' to accomplish a task based on a few examples. In other words, transformer networks 'learn' to train themselves based on the examples given. It is not so beyond beliefs that recurrent neural networks do the same thing. They learn to set up their internal states such that future tasks can be affected by previous input and patterns. In fact... playing around with models like RWKV, you soon learn that this is a fundamental part of the model. If you start talking to it in a certain way, it will start echoing that back. Clearly it's 'learning'.
sirk390 3y ago
> Whereas, in biological brains, the weights are updated continuously. My personal impression is that many "weights" are updated during sleep time. For example when training juggling, I will make no progress at all for hours of training. But later, after a night of sleep, I will have a large and instant progress.
- skissane 3y ago
  If I learn something new in the morning, very often I still remember it in the afternoon, even though I haven't been to sleep yet. Neuroscientists/psychologists/etc believe [0] humans have four tiers of memory: sensory memory (stores what you are experiencing right now, lasts for less than a second); working memory (lasts up to 30 seconds); intermediate-term memory (lasts 2-3 hours); long-term memory (anything from 30 minutes ago until the end of your life). We don't need to sleep to form new long-term memories – if at dinner time you can still remember what you ate for breakfast (I usually can if I think about it), that's your long-term memory at work. What we need sleep for, is pruning our long-term memory – each night the brain basically runs a compression process, deciding which long-term memories to keep and which to throw away (forget), and how much detail to keep for each memory. Regarding your juggling example – most neuroscientists believe that the brain stores different types of memories differently. How to perform a task is a procedural memory, and new or improved motor skills such as juggling are a particular form of procedural memory. How the brain processes them is likely quite different from how it processes episodic memories (events of your life) or semantic memories (facts, general knowledge, etc). Sleep may play a somewhat different role for each different memory type, so what's true for learning juggling may not be true for learning facts. [0] https://en.wikipedia.org/wiki/Intermediate-term_memory https://en.wikipedia.org/wiki/Intermediate-term_memory

anon291 3y ago

There is also a distinction in the brain between long-term and short-term memories. It is not so beyond belief that the brain stores short-term memories into long-term memories in a separate process (Perhaps sleep, whose lack thereof we know is linked with memory recall issues). Recurrent neural networks 'learn' continuously by changing their weights (In effect) based upon the 'previous state'. There are papers showing that attention mechanisms in transformers basically provide a 'weight' update function so that models can 'learn' to accomplish a task based on a few examples. In other words, transformer networks 'learn' to train themselves based on the examples given. It is not so beyond beliefs that recurrent neural networks do the same thing. They learn to set up their internal states such that future tasks can be affected by previous input and patterns. In fact... playing around with models like RWKV, you soon learn that this is a fundamental part of the model. If you start talking to it in a certain way, it will start echoing that back. Clearly it's 'learning'.

sirk390 3y ago

> Whereas, in biological brains, the weights are updated continuously. My personal impression is that many "weights" are updated during sleep time. For example when training juggling, I will make no progress at all for hours of training. But later, after a night of sleep, I will have a large and instant progress.

skissane 3y ago
If I learn something new in the morning, very often I still remember it in the afternoon, even though I haven't been to sleep yet. Neuroscientists/psychologists/etc believe [0] humans have four tiers of memory: sensory memory (stores what you are experiencing right now, lasts for less than a second); working memory (lasts up to 30 seconds); intermediate-term memory (lasts 2-3 hours); long-term memory (anything from 30 minutes ago until the end of your life). We don't need to sleep to form new long-term memories – if at dinner time you can still remember what you ate for breakfast (I usually can if I think about it), that's your long-term memory at work. What we need sleep for, is pruning our long-term memory – each night the brain basically runs a compression process, deciding which long-term memories to keep and which to throw away (forget), and how much detail to keep for each memory. Regarding your juggling example – most neuroscientists believe that the brain stores different types of memories differently. How to perform a task is a procedural memory, and new or improved motor skills such as juggling are a particular form of procedural memory. How the brain processes them is likely quite different from how it processes episodic memories (events of your life) or semantic memories (facts, general knowledge, etc). Sleep may play a somewhat different role for each different memory type, so what's true for learning juggling may not be true for learning facts. [0] https://en.wikipedia.org/wiki/Intermediate-term_memory https://en.wikipedia.org/wiki/Intermediate-term_memory