diff --git a/README.md b/README.md
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@@ -36,7 +36,7 @@ ppt/pdf支持直链下载，也支持百度云盘全部下载。
 |Deep Learning|Guideline of ML: overfit|[链接](https://www.bilibili.com/video/BV1Wv411h7kN?p=10)|[ppt](https://speech.ee.ntu.edu.tw/~hylee/ml/ml2021-course-data/overfit-v6.pptx) [pdf](https://speech.ee.ntu.edu.tw/~hylee/ml/ml2021-course-data/overfit-v6.pdf)|-|
 |Deep Learning|Critical Point: small gradient|[链接](https://www.bilibili.com/video/BV1Wv411h7kN?p=11)|[ppt](https://speech.ee.ntu.edu.tw/~hylee/ml/ml2021-course-data/small-gradient-v7.pptx) [pdf](https://speech.ee.ntu.edu.tw/~hylee/ml/ml2021-course-data/small-gradient-v7.pdf)|-|
 |Deep Learning|Adaptive Learning Rate: optimizer|[链接](https://www.bilibili.com/video/BV1Wv411h7kN?p=13)|[ppt](https://speech.ee.ntu.edu.tw/~hylee/ml/ml2021-course-data/optimizer_v4.pptx) [pdf](https://speech.ee.ntu.edu.tw/~hylee/ml/ml2021-course-data/optimizer_v4.pdf)|-|
-|Deep Learning|Adaptive Learning Rate: optimizer|[链接](https://www.bilibili.com/video/BV1Wv411h7kN?p=14)|[ppt](https://speech.ee.ntu.edu.tw/~hylee/ml/ml2021-course-data/classification_v2.pptx) [pdf](https://speech.ee.ntu.edu.tw/~hylee/ml/ml2021-course-data/classification_v2.pdf)|HW2: Classification|
+|Deep Learning|Loss of Classification: classification|[链接](https://www.bilibili.com/video/BV1Wv411h7kN?p=14)|[ppt](https://speech.ee.ntu.edu.tw/~hylee/ml/ml2021-course-data/classification_v2.pptx) [pdf](https://speech.ee.ntu.edu.tw/~hylee/ml/ml2021-course-data/classification_v2.pdf)|HW2: Classification|
 |CNN & Self-Attention|ML Pretest|-|[pdf](https://speech.ee.ntu.edu.tw/~hylee/ml/ml2021-course-data/pretest.pdf)|-|
 |CNN & Self-Attention|CNN|[链接](https://www.bilibili.com/video/BV1Wv411h7kN?p=22)|[ppt](https://speech.ee.ntu.edu.tw/~hylee/ml/ml2021-course-data/cnn_v4.pptx) [pdf](https://speech.ee.ntu.edu.tw/~hylee/ml/ml2021-course-data/cnn_v4.pdf)|HW3: CNN|
 |CNN & Self-Attention|Self-Attention|[链接](https://www.bilibili.com/video/BV1Wv411h7kN?p=23)|[ppt](https://speech.ee.ntu.edu.tw/~hylee/ml/ml2021-course-data/self_v7.pptx) [pdf](https://speech.ee.ntu.edu.tw/~hylee/ml/ml2021-course-data/self_v7.pdf)|HW4: Self-Attention|