code: @Override
      public INDArray rand(long rows, long columns) {
          return rand(new long[] {rows, columns}, System.currentTimeMillis());
      }
docs: Create a random ndarray with the given shape using
  the current time as the seed
  
  @param rows    the number of rows in the matrix
  @param columns the number of columns in the matrix
  @return the random ndarray with the specified shape