How to use

ml.dmlc.xgboost4j.LabeledPoint

constructor

/** Transform List<String> inputs into a XGBoost input format */
@Nullable
public static LabeledPoint parseFeatures(final double target,
    @Nonnull final String[] features) {
  final int size = features.length;
  if (size == 0) {
    return null;
  }
  final int[] indices = new int[size];
  final float[] values = new float[size];
  for (int i = 0; i < size; i++) {
    if (features[i] == null) {
      continue;
    }
    final String str = features[i];
    final int pos = str.indexOf(':');
    if (pos >= 1) {
      indices[i] = Integer.parseInt(str.substring(0, pos));
      values[i] = Float.parseFloat(str.substring(pos + 1));
    }
  }
  return new LabeledPoint((float) target, indices, values);
}