liuyu/pgvector
1
0
Fork 0
mirror of https://github.com/pgvector/pgvector.git synced 2026-06-30 17:51:18 +08:00
Code Issues Packages Projects Releases Wiki Activity

Added L2 distance [skip ci]

Browse Source
This commit is contained in:
Andrew Kane
2024-09-23 16:52:07 -07:00
parent 035a31ac91
commit 274e6544d4
5 changed files with 95 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
src/minivec.c
View File

@@ -17,6 +17,18 @@
#include "utils/numeric.h"
#include "vector.h"
/*
* Ensure same dimensions
*/
static inline void
CheckDims(MiniVector * a, MiniVector * b)
{
if (a->dim != b->dim)
ereport(ERROR,
(errcode(ERRCODE_DATA_EXCEPTION),
errmsg("different minivec dimensions %d and %d", a->dim, b->dim)));
}
/*
* Ensure expected dimensions
*/
@@ -334,3 +346,34 @@ minivec_send(PG_FUNCTION_ARGS)
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
static float
MinivecL2SquaredDistance(int dim, fp8 * ax, fp8 * bx)
{
float distance = 0.0;
/* Auto-vectorized */
for (int i = 0; i < dim; i++)
{
float diff = Fp8ToFloat4(ax[i]) - Fp8ToFloat4(bx[i]);
distance += diff * diff;
}
return distance;
}
/*
* Get the L2 distance between fp8 vectors
*/
FUNCTION_PREFIX PG_FUNCTION_INFO_V1(minivec_l2_distance);
Datum
minivec_l2_distance(PG_FUNCTION_ARGS)
{
MiniVector *a = PG_GETARG_MINIVEC_P(0);
MiniVector *b = PG_GETARG_MINIVEC_P(1);
CheckDims(a, b);
PG_RETURN_FLOAT8(sqrt((double) MinivecL2SquaredDistance(a->dim, a->x, b->x)));
}