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:
- Part-of-speech (POS) tagging
- 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