k-means clustering use cluster centers to model the data;.
here is a figure to illustrate the cluster centers.
there are 3 black dot in the figure represents 3 centers.
which expression is more clear, concise and idiomatic? I prefer the last one, just need a double confirmation.
expression_1: they are the 3 centers of 3 clusters?
expression_2: they are 3 centers of 3 clusters?
expression_3: they are 3 centers of clusters?
expression_4: they are 3 cluster centers?