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Update chapter2.md
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zhimin-z committed Sep 19, 2024
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虽然这种理解适用于机器学习,但我们必须注意,对于深度学习,需要进一步的考虑。例如双下降现象与传统机器学习理论相矛盾,后者认为增加模型大小和数据量通常会提高模型的泛化性能。

![double_descent](images/double_descent.png)
<div style="text-align: center;">
<img src="images/double_descent.png" alt="double_descent" width="500" height="300"/>
</div>

双下降现象中描绘模型泛化性能的曲线图由三个阶段组成:
1. 第一阶段:当模型规模小且数据量不足时,模型泛化性能较差。
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