nlp

Semantic Representation (语义表征)

nlp664-week7

Posted by renjie on March 1, 2020


Semantic Representation (语义表征)

1. First Order Logic (一阶逻辑)

  • Constants常量
  • Functions 函数
    LocationOf()
  • Variables 变量

特点

词汇表面意思不一定等于实际意思

不是所有逻辑都那么清晰,现实会更复杂

适用于物体+动作的句子,而非理念想法等虚的

2.Frames

Frames are a type of structured representation or schema and are widely used for knowledge organization

3: Semantic Networks

Semantic Roles

Prop Bank

Frame net


SRL task (semantic role labeling) 算法

前提:

  1. Part-of-speech (POS) tagging
  2. Parse trees or dependency trees

首先找constituent然后分析arg,算概率,选概率最高的arg。然后贴label,选概率最高的label