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nce loss 与 sampled softmax loss 到底有什么区别?怎么选择? nce_loss 与 sampled_softmax_loss如何选择 nce_loss用的是logisticLoss,sampled_softmax_loss 用的是softmax,可以从下面loss的形式看出,对于每一个样品i,logisticloss可以有多个标签,就是同时训练多个二分类器。