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Requirements and Challenges

• Scalability
• Clustering all the data instead of only on samples
• Ability to deal with different types of attributes
• Numerical, binary, categorical, ordinal, linked, and mixture of these
• Constraint-based clustering
• User may give inputs on constraints
• Use domain knowledge to determine input parameters
• Interpretability and usability
• Others
• Discovery of clusters with arbitrary shape
• Ability to deal with noisy data
• Incremental clustering and insensitivity to input order
• High dimensionality