add fifth chapter
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@ -267,6 +267,7 @@ tensor([ -9.5042, -10.3796, -11.3677, -11.4798, -9.7764, -12.2561])
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> $$ ln(0.2)+ln(0.1)+ln(0.05)≈−1.6094+(−2.3026)+(−2.9957)=−6.9077 $$
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> 虽然这个和也是负数,但它不会像直接相乘的结果那样接近于0,避免了数值下溢的问题。**对数的累加性质**允许我们将原本的累乘操作转换为累加,使得计算更加稳定和高效。
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> 2. **归属概率在损失函数中的作用**
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