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Note that there is free Unix, Mac and PC software that will let you read and print postscript files on these systems. If you're serious about neural networking you will need postscript on your system some day because all the online papers use it. An HTML Version . There is a short online article by G. Thimm, P. Moerland and E. Fiesler that relates the gain to the learning rate and the size of the initial weights. Backprop training can be quite complicated and to do it properly see the online article by Lutz Prechelt .