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NLG (Caption) 评价指标总结 | xxn's learning

https://wsntxxn.github.io/2020/07/08/NLG-Caption-%E8%AF%84%E4%BB%B7%E6%8C%87%E6%A0%87%E6%80%BB%E7%BB%93/#more

评价指标对于我的 audio caption 任务一直是一个 bottleneck,机器自动给生成的 caption 打的分数总是难以反映其质量,在此回顾一下常用的 caption 任务的自动评测指标,包括近年来提出的一些还未广泛使用的新指标。 自然语言生成 (Natural Language Generation) 的评价一直是难题。以句子翻译为例,一个英文句子可能对应好几种中文的表述,即

EM算法简介 | xxn's learning

https://wsntxxn.github.io/2019/07/24/EM%E7%AE%97%E6%B3%95%E7%AE%80%E4%BB%8B/

老实说,EM算法这玩意曾经一直是我心里一个坑,学了至少三遍 (周志华西瓜书第一遍,李航《统计学习方法》第二遍,过了一年又回顾了一遍) 才有了比较清楚的思路。跟着各种教程一行行看很容易陷入推导长长的公式的泥沼,到头来知道中间有用Jensen不等式放缩,知道要优化一个下界函数,但具体谈起细节来又不是那么清楚。这里我试图把我学习三次之后的理解分享一下,提供我自己理解EM算法的视角。 当然,看完这篇还是不

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