Assigning weight 2.0 to examples from the first class
  - original class distribution:  <15.000, 4.000, 5.000>
  - weighted class distribution:  <30.000, 4.000, 5.000>

Equalizing class distribution
  - original class distribution:  <15.000, 4.000, 5.000>
  - weighted class distribution:  <8.000, 8.000, 8.000>

Equalizing class distribution and weighting by [0.5, 0.25, 0.25]
  - original class distribution:  <15.000, 4.000, 5.000>
  - weighted class distribution:  <12.000, 6.000, 6.000>
