docs: public static <T extends DMatrix> T loadBin(String fileName)
          throws IOException
      {
          FileInputStream fileStream = new FileInputStream(fileName);
          ObjectInputStream stream = new ObjectInputStream(fileStream);
  
          T ret;
          try {
              ret = (T)stream.readObject();
              if( stream.available() !=  0 ) {
                  throw new RuntimeException("File not completely read?");
              }
          } catch (ClassNotFoundException e) {
              throw new RuntimeException(e);
          }
  
          stream.close();
          return (T)ret;
      }