MWU test:
       #key, ties, win, loss, win-loss
 kmeans|256,    1,  15,    0,       15
 kmeans|128,    1,  14,    1,       13
  kmeans|64,    1,  13,    2,       11
  kmeans|32,    1,  12,    3,        9
  kmeans|16,    1,  11,    4,        7
 kmeans|512,   16,   0,    0,        0
   kmeans|4,    8,   3,    5,       -2
   genic|64,    8,   3,    5,       -2
   genic|32,    8,   3,    5,       -2
  genic|256,    8,   3,    5,       -2
  genic|128,    8,   3,    5,       -2
  genic|512,    9,   2,    5,       -3
   genic|16,    9,   2,    5,       -3
 genic|1024,    9,   2,    5,       -3
    genic|4,    4,   2,   10,       -8
   kmeans|1,    2,   0,   14,      -14
    genic|1,    2,   0,   14,      -14

Quartiles:
 #learner,     0,    25,    50,    75,                                                  100
      3.8,   8.9,  10.9,  12.8,  23.8, [--- |++++++                                       ]
      0.0,  17.3,  29.1,  51.7,  79.4, [--------     |          ++++++++++++++            ]