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公式:
$$
\mathrm{softmax}(\mathbf{X}){ij} = \frac{\exp(\mathbf{X}{ij})}{\sum_k \exp(\mathbf{X}_{ik})}. $$
中,我认为softmax的参数$X$下标ij应该在括号里面,这样表示$X_ij$在该行所有元素中的softmax值。