Github user sethah commented on the issue:
https://github.com/apache/spark/pull/15342
Looking good. My main concern is that now you can have the following:
````scala
scala> model.getK
res2: Int = 3
scala> model.clusterCenters.length
res3: Int = 1
````
We could set the model `k` to match the cluster centers length before
creating the model, during training. We could leave it, but then what does `k`
mean, if not the number of centers?
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