code: @Override
      public void rotmg(INDArray d1, INDArray d2, INDArray b1, double b2, INDArray P) {
          throw new UnsupportedOperationException();
      }
docs: computes the modified parameters for a Givens rotation.
  
  @param d1
  @param d2
  @param b1
  @param b2
  @param P