code: @Override
      protected void daxpyi(long N, double alpha, INDArray X, DataBuffer pointers, INDArray Y){
          cblas_daxpyi((int) N, alpha, (DoublePointer) X.data().addressPointer(), (IntPointer) pointers.addressPointer(),
                  (DoublePointer) Y.data().addressPointer());
      }
docs: Adds a scalar multiple of double compressed sparse vector to a full-storage vector.
  
  @param N The number of elements in vector X
  @param alpha
  @param X a sparse vector
  @param pointers A DataBuffer that specifies the indices for the elements of x.
  @param Y a dense vector