public SDVariable unsortedSegmentMean(String name, SDVariable data, SDVariable segmentIds,
      SDVariable numSegments) {
    SDValidation.validateNumerical("unsortedSegmentMean", "data", data);
    SDValidation.validateNumerical("unsortedSegmentMean", "segmentIds", segmentIds);
    SDValidation.validateInteger("unsortedSegmentMean", "numSegments", numSegments);