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Artificial neural networks learn better when they spend time not learning at all

Published On 2022-11-22T09:00:50+05:30  |  Updated On 22 Nov 2022 3:30 AM GMT
Artificial neural networks learn better when they spend time not learning at all

Overview

Artificial neural networks leverage the architecture of the human brain to improve numerous technologies and systems, from basic science and medicine to finance and social media. In some ways, they have achieved superhuman performance, such as computational speed, but they fail in one key aspect: When artificial neural networks learn sequentially, new information overwrites previous information, a phenomenon called catastrophic forgetting.

Depending on age, humans need 7 to 13 hours of sleep per 24 hours. During this time, a lot happens: Heart rate, breathing and metabolism ebb and flow; hormone levels adjust; the body relaxes. Not so much in the brain. Memories are represented in the human brain by patterns of synaptic weight - the strength or amplitude of a connection between two neurons.

The scientists used spiking neural networks that artificially mimic natural neural systems: Instead of information being communicated continuously, it is transmitted as discrete events (spikes) at certain time points.

They found that when the spiking networks were trained on a new task, but with occasional off-line periods that mimicked sleep, catastrophic forgetting was mitigated. Like the human brain, said the study authors, "sleep" for the networks allowed them to replay old memories without explicitly using old training data.

Synaptic plasticity, the capacity to be altered or molded, is still in place during sleep and it can further enhance synaptic weight patterns that represent the memory, helping to prevent forgetting or to enable transfer of knowledge from old to new tasks.

It meant that these networks could learn continuously, like humans or animals. Understanding how human brain processes information during sleep can help to augment memory in human subjects. Augmenting sleep rhythms can lead to better memory they ended.

Reference:

Ryan Golden , Jean Erik Delanois, et al, (2022, November 18), Artificial neural networks learn better when they spend time not learning at all, PLOS Computational Biology, DOI: 10.1371/journal.pcbi.1010628.

Speakers

Dr Rashi Prakash

Artificial neural networks human brain brain catastrophic forgetting Memories neurons spikes PLOS Computational Biology 
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