In the process of error back propagation, the chain derivation will go through several layers of neurons. Finally, the error of the first layer is the error of the penultimate layer after the weight distribution, and the error of the penultimate layer becomes the error of the penultimate layer after the weight distribution of the next layer..... And so on. At last, it spread to the first layer, and the wheel of error ran over all the neurons. All the weights and thresholds are changed, and the training is completed at one time. After a lot of training, the weights and thresholds are optimized to a very good level, and then can be predicted.<br>
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