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Comment: [Original edit by JustinMason]

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Versions since 3.0.0 are now using a perceptron, written by Henry Stern, to perform the same task (but a lot faster); his program 'implements the "Stochastic \[http://grin-optics.org Gradient\] Descent" method of training a neural network.  It uses a single perceptron with a logsig activation function and maps the weights to [SpamAssassin] score space.'  See the file "\[http://www.spamassassin.org/full/3.0.x/dist/masses/README.perceptron masses/README.perceptron\]" for more details.

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