code: public static SparseVector fromMatrixMarket(InputStream is) throws IOException {
          return Vector.fromMatrixMarket(is).to(Vectors.SPARSE);
      }
docs: Parses {@link SparseVector} from the given Matrix Market.
  
  @param is the input stream in Matrix Market format
  
  @return a parsed vector
  @exception  IOException  if an I/O error occurs.