理学 降维 释 dimensionality reduction 降维 模式识别和机器学习领域中的降维就是指采用某种映射方法，将原高维空间中的数据点映射到低维度的空间中。
数据库 数据库新技术 释文 dimensionality reduction 降维
- attitude pursuit guidance
- attitude scale
- attitude sensor
- attitude stability
- attitude stability control
- attitude transformation model
- attitude，orbit and trajectory control of lunar probe
- atto
- attosecond
- attosecond laser
- attosecond physics
- attosecond pump-probe technique
- attosecond streak camera
- attract
- attractant
- attracting
- attracting basin
- attracting boundary
- attracting cycle
- attracting periodic orbit
- attracting point
- attracting set
- attraction
- attraction basin
- attraction domain