public SDVariable unsortedSegmentSqrtN(SDVariable data, SDVariable segmentIds,
      SDVariable numSegments) {
    SDValidation.validateNumerical("unsortedSegmentSqrtN", "data", data);
    SDValidation.validateNumerical("unsortedSegmentSqrtN", "segmentIds", segmentIds);
    SDValidation.validateInteger("unsortedSegmentSqrtN", "numSegments", numSegments);