I tried to run testKMeans.scala, but fail when my input is: 0 0.0 0.0 0.0 1 0.1 0.1 0.1 2 0.2 0.2 0.2 3 9.0 9.0 9.0 4 9.1 9.1 9.1 5 9.2 9.2 9.2 what's the format of input?