批量歸一化與未歸一化的比較

未歸一化的比較： training on cpu epoch 1, loss 0.0091, train acc 0.104, test acc 0.100, time 61.8 sec epoch 2, loss 0.0053, train acc 0.464, test acc 0.611, time 59.1 sec epoch 3, loss 0.0034, train acc 0.652

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