[Note] 20090325

• feature significance (without label / subset)
  
• tf-idf, c-tf-idf
  
• feature significance (with label / subset)
  
• MI, x^2, correlation (subset)
  
• exploiting feature correlation (without label / transform)
  
• PCA, manifold methods (LLE, ISOMAP)
  
• exploiting feature correlation (with label / transform)
  
• fisher (LDA)
  
• optimizing classification (subset)
  
• adaboost, maximum entropy
  
• exploiting hidden semantics (topics)
  
• pLSA, SVD, LSI, Information Bottleneck