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Sleepychord avatar Sleepychord commented on July 28, 2024

我没有特别理解你的意思,但是感觉你的“现在的”理解是对的。

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ditingdapeng avatar ditingdapeng commented on July 28, 2024

谢谢回复,我换一种表达方式:

  1. 系统一在访问节点x时的输入:
    [CLS] Question [SEP] clues[x,G] [SEP] Para[x]
    Sentence A Sentence B
  2. 系统一Bert的输出向量表示为:T

(问题)但是其中出现了sem[x,Q,clues], 这个的作用是什么?

同样在系統2中也出现了对sem[x,Q,clues]的表述,在论文3.1节和3.2节。

原文的表述如下:

  1. (3.1) It is worth noting that for answer node x, Para[x] is probably missing. Thus we do not extract spans but can still calculate sem[x,Q,clues] based on "Sentence A"part.
  2. (3.2) To fully understand the relation between an entity x and the question Q,barely analyzing semantics sem[x,Q,clues] is insufficient.

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Sleepychord avatar Sleepychord commented on July 28, 2024

系统一的输出不是T,而是抽取的span(entities/ answer candidates)和 sem[x, Q, clues]。后者被用作GNN的feature。

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ditingdapeng avatar ditingdapeng commented on July 28, 2024

收到,谢谢解答~!我还有个问题:bert的输出不是向量吗?但是这个抽取的span看上去更像是一个索引(以标记候选实体),而sem貌似是一个向量组合,所以对"输出的是抽取的span(entities/ answer candidates)和 sem[x, Q, clues]", 还有些疑惑

(有些小白,谢谢答疑~)

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Sleepychord avatar Sleepychord commented on July 28, 2024

bert直接输出是向量,但是在下游finetune的时候一般需要加一层相关的输出层,比如mrc就是加这样的span prediction的层,可以看一下bert文章和cogqa的图。

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