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README.md

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 1. 识别数字[[.html](recognize_digits/README.html)] [[.pdf](recognize_digits/README.pdf)] [[.src](recognize_digits/)]
 1. 图像分类[[.html](classify_images/README.html)] [[.pdf](classify_images/README.pdf)] [[.src](classify_images/)]
 1. 词向量[[.html](word2vec/README.html)] [[.pdf](word2vec/)] [[.src](word2vec/README.pdf)]
-1. 情感分析[[.html](understand_sentiment/README.html)] [[.pdf](understand_sentiment/)README.pdf] [[.src](understand_sentiment/)]
+1. 情感分析[[.html](understand_sentiment/README.html)] [[.pdf](understand_sentiment/README.pdf)] [[.src](understand_sentiment/)]
 1. 理解单词的语义[[.html](label_semantic_roles/README.html)] [[.pdf](label_semantic_roles/README.pdf)] [[.src](label_semantic_roles/)]
 1. 机器翻译[[.html](machine_translation/README.html)] [[.pdf](machine_translation/README.pdf)] [[.src](machine_translation/)]
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 <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="知识共享许可协议" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a><br /><span xmlns:dct="http://purl.org/dc/terms/" href="http://purl.org/dc/dcmitype/Text" property="dct:title" rel="dct:type">本教程</span> 由 <a xmlns:cc="http://creativecommons.org/ns#" href="http://book.paddlepaddle.org" property="cc:attributionName" rel="cc:attributionURL">PaddlePaddle</a> 创作，采用 <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">知识共享 署名-非商业性使用-相同方式共享 4.0 国际 许可协议</a>进行许可。