alex_bn_lee

摘要： cross-entropy 损失函数 $L = -ln(p_c) = -ln(softmax(y_c))$ $p_c = softmax(y_c) = \frac{e^{y_c}}{e^{y_1} + ... + e^{y_c} + ... + e^{y_n}}$ 阅读全文