l2_norm()

函数说明

l2_norm 函数用于计算 l2/欧几里得范数。l2 范数通过对向量元素的平方和进行平方根运算得到。

l2_normy

函数语法

1. > SELECT l2_norm(vector) AS result FROM table_name;

示例

1. drop table if exists vec_table;
2. create table vec_table(a int, b vecf32(3), c vecf64(3));
3. insert into vec_table values(1, "[1,2,3]", "[4,5,6]");
4. mysql> select * from vec_table;
5. +------+-----------+-----------+
6. | a    | b         | c         |
7. +------+-----------+-----------+
8. |    1 | [1, 2, 3] | [4, 5, 6] |
9. +------+-----------+-----------+
10. 1 row in set (0.00 sec)

12. mysql> select l2_norm(b) from vec_table;
13. +--------------------+
14. | l2_norm(b)         |
15. +--------------------+
16. | 3.7416573867739413 |
17. +--------------------+
18. 1 row in set (0.01 sec)