fmcquillan99 commented on issue #433: Kmeans: Add automatic optimal cluster 
estimation
URL: https://github.com/apache/madlib/pull/433#issuecomment-532339225
 
 
   @orhankislal may I suggest we throw an error if user puts dup values of k in 
the array for k:
   ```
   k
   INTEGER[]. Array of k values to test. Does not need to be contiguous but all 
elements must be >1. Parameter 'k_selection_algorithm' determines the 
evaluation method.
   ```
   
   e.g., if I put 
   ```
   k[2,2,3]
   ```
   throw and error that says
   ```
   k values must not be duplicated
   ```
   or similar

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