Distributed Representation vector x function vector z (High Dim) (Low Dim) 。Feature selection X2 Select x2 X1 Principle component analysis (PCA) [Bishop,Chapter 12] z=WxDistributed Representation • Feature selection • Principle component analysis (PCA) ? 𝑥1 𝑥2 Select 𝑥2 [Bishop, Chapter 12] 𝑧 = 𝑊𝑥 function vector x vector z (High Dim) (Low Dim)