@Override
    public INDArray randn(long rows, long columns) {
        return randn(new long[] {rows, columns}, System.currentTimeMillis());
    }
@ Override public INDArray randn ( long rows , long columns ) { return randn ( new long [ ] { rows , columns } , System . currentTimeMillis ( ) ) ; }
Random normal using the current time stamp
as the seed

@param rows    the number of rows in the matrix
@param columns the number of columns in the matrix
@return