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
- nebular physics
- nebular spectrograph
- nebular spectrum
- nebular stage
- nebular transition
- nebular variable
- nebulium
- nebulization
- nebulization efficiency
- nebulizer
- nebulizers
- nebulizer therapy
- nebulosity
- nebulous bridge
- nebulous cluster
- nebulous envelope
- nebulous object
- nebulous patch
- nebulous ring
- NEC
- necator americanus
- necessary
- necessary and sufficient condition
- necessary and sufficient statistic
- necessary and sufficient σ-field