public static boolean isInSparseFormat(MatrixObject mo) {
   if (mo.getGPUObject() != null && mo.getGPUObject().isAllocated())
     return mo.getGPUObject().isInSparseFormat();
   return MatrixBlock.evalSparseFormatInMemory(mo.getNumRows(), mo.getNumColumns(), mo.getNnz());
 }