Add activation function #299
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An NN should always have activation functions (like
relu), or otherwise it's just a trivial linear model.By applying
relu, accuracy forneural_network.py: 92% -> 95%,and accuracy for
neural_network_raw.py: 92% -> 94%Also the learning rate is too large, even for an example. In practice it's typical to set it somewhere between 1e-2 and 1e-4.