08/10/2024
Imagine that you are trying to remember a fairly unusual word that you rarely use, such as one for that sloping floor often found in cinemas and lecture halls. You search your memory. It’s something like ramp… perhaps rad…ial? No, not that. Rake, that’s it!
The process of searching through similar words to find the right one is reminiscent of the associative memory that this year’s physics laureate John Hopfield discovered in 1982. The Hopfield network can store patterns and has a method for recreating them. When the network is given an incomplete or slightly distorted pattern, the method can find the stored pattern that is most similar.
The Hopfield network stores information in a manner similar to shaping a landscape. The method is special because several pictures can be saved at the same time and the network can usually differentiate between them. The Hopfield network can also be used to recreate data that contains noise or which has been partially erased.
The 2024 Nobel Prize in Physics has been awarded to John J. Hopfield and Geoffrey E. Hinton “for foundational discoveries and inventions that enable machine learning with artificial neural networks.”
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