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back +‎ propagation


backpropagation (countable and uncountable, plural backpropagations)

  1. (computing) An error correction technique used in neural networks
    • 2020, Timothy P. Lillicrap, Adam Santoro, Luke Marris, Colin J. Akerman and Geoffrey Hinton, “Backpropagation and the brain”, in Nature[1]:
      In machine learning, backpropagation of error (‘backprop’) is the algorithm most often used to train deep neural networks and is the most successful learning procedure for these networks.
  2. (neurology) A phenomenon in which the action potential of a neuron creates a voltage spike both at the end of the axon, as normally, and also back through to the dendrites from which much of the original input current originated.
    • 2000 October 27, Idan Segev & Michael London, “Untangling Dendrites with Quantitative Models”, in Science[2], volume 290, number 5492, DOI:10.1126/science.290.5492.744, pages 744-750:
      Experiments show that these ion channels furnish the dendrites with a rich repertoire of electrical behaviors, from essentially passive responses, to subthreshold active responses, to active backpropagation of the action potential (AP) from the soma into the dendrites, to the initiation of APs in the dendritic tree.

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