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论文： Understanding the difficulty of training deep feed forward neural networks单层网络Assume yi=w1ix1i+...+wnixni+biy_i = w_{1i}x_{1i}+...+w_{n_i}x_{n_i}+b_iyi​=w1i​x1i​+...+wni​​xni​​+bi​, inputs and weights are zero-mean, independent and identically distri