Unsupervised Learning Algorithms

• Apache MADlib - SQL-based Analytics.

Association Rules

• Apriori Algorithm (先验算法)

Clustering

• k-Means Clustering

Dimensionality Reduction (降维)

• Principal Component Analysis (PCA) (主成分分析)

Topic Modelling

• Latent Dirichlet Allocation (LDA) (隐含狄利克雷分布)