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my task is to learn simple neural network, input size 1, hidden layer size 8 and output size 1, a function f = {0->1,1->0,2->0,3->1}, but can learn the network to get satisfing result. I am using activation function, backpropagation and initial values in range (-1,1). But I cant get better result in supremum error norm than 0.5, never achieved under 0.5. What can I do wrong, thats only 4 examples to learn, why is so hard to learn that naetwork? 2 years ago I tried to learn XOR in similar way and also had same problem.

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