mirror of
https://github.com/asg017/sqlite-vec.git
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l1 distance (#39)
* initial work on l1 * l1 int8 neon implementation * tweak l1 int8 and add test * broken overflow still * some progress on l1 * change to i32 instead of i64 * remove comment * ignore poetry stuff * unrolled l1 int8 and format * remove comments
This commit is contained in:
Daniel Levi-Minzi
GitHub
parent
6eb2397537
commit
25b85afc89
3 changed files with 267 additions and 15 deletions
207
sqlite-vec.c
207
sqlite-vec.c
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@ -230,6 +230,100 @@ static f32 l2_sqr_int8_neon(const void *pVect1v, const void *pVect2v,
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return sqrtf(sum_scalar);
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}
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static i32 l1_int8_neon(const void *pVect1v, const void *pVect2v,
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const void *qty_ptr) {
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i8 *pVect1 = (i8 *)pVect1v;
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i8 *pVect2 = (i8 *)pVect2v;
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size_t qty = *((size_t *)qty_ptr);
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const int8_t *pEnd1 = pVect1 + qty;
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int32x4_t acc1 = vdupq_n_s32(0);
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int32x4_t acc2 = vdupq_n_s32(0);
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int32x4_t acc3 = vdupq_n_s32(0);
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int32x4_t acc4 = vdupq_n_s32(0);
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while (pVect1 < pEnd1 - 63) {
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int8x16_t v1 = vld1q_s8(pVect1);
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int8x16_t v2 = vld1q_s8(pVect2);
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int8x16_t diff1 = vabdq_s8(v1, v2);
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acc1 = vaddq_s32(acc1, vpaddlq_u16(vpaddlq_u8(diff1)));
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v1 = vld1q_s8(pVect1 + 16);
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v2 = vld1q_s8(pVect2 + 16);
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int8x16_t diff2 = vabdq_s8(v1, v2);
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acc2 = vaddq_s32(acc2, vpaddlq_u16(vpaddlq_u8(diff2)));
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v1 = vld1q_s8(pVect1 + 32);
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v2 = vld1q_s8(pVect2 + 32);
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int8x16_t diff3 = vabdq_s8(v1, v2);
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acc3 = vaddq_s32(acc3, vpaddlq_u16(vpaddlq_u8(diff3)));
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v1 = vld1q_s8(pVect1 + 48);
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v2 = vld1q_s8(pVect2 + 48);
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int8x16_t diff4 = vabdq_s8(v1, v2);
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acc4 = vaddq_s32(acc4, vpaddlq_u16(vpaddlq_u8(diff4)));
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pVect1 += 64;
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pVect2 += 64;
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}
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while (pVect1 < pEnd1 - 15) {
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int8x16_t v1 = vld1q_s8(pVect1);
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int8x16_t v2 = vld1q_s8(pVect2);
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int8x16_t diff = vabdq_s8(v1, v2);
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acc1 = vaddq_s32(acc1, vpaddlq_u16(vpaddlq_u8(diff)));
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pVect1 += 16;
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pVect2 += 16;
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}
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int32x4_t acc = vaddq_s32(vaddq_s32(acc1, acc2), vaddq_s32(acc3, acc4));
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int32_t sum = 0;
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while (pVect1 < pEnd1) {
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int32_t diff = abs((int32_t)*pVect1 - (int32_t)*pVect2);
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sum += diff;
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pVect1++;
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pVect2++;
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}
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return vaddvq_s32(acc) + sum;
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}
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static double l1_f32_neon(const void *pVect1v, const void *pVect2v,
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const void *qty_ptr) {
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f32 *pVect1 = (f32 *)pVect1v;
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f32 *pVect2 = (f32 *)pVect2v;
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size_t qty = *((size_t *)qty_ptr);
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const f32 *pEnd1 = pVect1 + qty;
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float64x2_t acc = vdupq_n_f64(0);
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while (pVect1 < pEnd1 - 3) {
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float32x4_t v1 = vld1q_f32(pVect1);
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float32x4_t v2 = vld1q_f32(pVect2);
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pVect1 += 4;
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pVect2 += 4;
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// f32x4 -> f64x2 pad for overflow
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float64x2_t low_diff = vabdq_f64(vcvt_f64_f32(vget_low_f32(v1)),
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vcvt_f64_f32(vget_low_f32(v2)));
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float64x2_t high_diff =
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vabdq_f64(vcvt_high_f64_f32(v1), vcvt_high_f64_f32(v2));
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acc = vaddq_f64(acc, vaddq_f64(low_diff, high_diff));
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}
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double sum = 0;
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while (pVect1 < pEnd1) {
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sum += fabs((double)*pVect1 - (double)*pVect2);
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pVect1++;
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pVect2++;
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}
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return vaddvq_f64(acc) + sum;
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}
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#endif
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static f32 l2_sqr_float(const void *pVect1v, const void *pVect2v,
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@ -286,6 +380,54 @@ static f32 distance_l2_sqr_int8(const void *a, const void *b, const void *d) {
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return l2_sqr_int8(a, b, d);
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}
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static i32 l1_int8(const void *pA, const void *pB, const void *pD) {
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i8 *a = (i8 *)pA;
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i8 *b = (i8 *)pB;
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size_t d = *((size_t *)pD);
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i32 res = 0;
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for (size_t i = 0; i < d; i++) {
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res += abs(*a - *b);
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a++;
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b++;
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}
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return res;
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}
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static i32 distance_l1_int8(const void *a, const void *b, const void *d) {
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#ifdef SQLITE_VEC_ENABLE_NEON
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if ((*(const size_t *)d) > 15) {
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return l1_int8_neon(a, b, d);
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}
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#endif
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return l1_int8(a, b, d);
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}
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static double l1_f32(const void *pA, const void *pB, const void *pD) {
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f32 *a = (f32 *)pA;
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f32 *b = (f32 *)pB;
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size_t d = *((size_t *)pD);
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double res = 0;
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for (size_t i = 0; i < d; i++) {
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res += fabs((double)*a - (double)*b);
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a++;
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b++;
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}
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return res;
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}
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static double distance_l1_f32(const void *a, const void *b, const void *d) {
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#ifdef SQLITE_VEC_ENABLE_NEON
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if ((*(const size_t *)d) > 3) {
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return l1_f32_neon(a, b, d);
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}
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#endif
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return l1_f32(a, b, d);
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}
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static f32 distance_cosine_float(const void *pVect1v, const void *pVect2v,
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const void *qty_ptr) {
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f32 *pVect1 = (f32 *)pVect1v;
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@ -1040,6 +1182,48 @@ finish:
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bCleanup(b);
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return;
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}
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static void vec_distance_l1(sqlite3_context *context, int argc,
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sqlite3_value **argv) {
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assert(argc == 2);
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int rc;
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void *a, *b;
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size_t dimensions;
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vector_cleanup aCleanup, bCleanup;
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char *error;
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enum VectorElementType elementType;
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rc = ensure_vector_match(argv[0], argv[1], &a, &b, &elementType, &dimensions,
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&aCleanup, &bCleanup, &error);
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if (rc != SQLITE_OK) {
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sqlite3_result_error(context, error, -1);
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sqlite3_free(error);
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return;
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}
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switch (elementType) {
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case SQLITE_VEC_ELEMENT_TYPE_BIT: {
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sqlite3_result_error(
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context, "Cannot calculate L1 distance between two bitvectors.", -1);
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goto finish;
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}
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case SQLITE_VEC_ELEMENT_TYPE_FLOAT32: {
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double result = distance_l1_f32(a, b, &dimensions);
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sqlite3_result_double(context, result);
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goto finish;
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}
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case SQLITE_VEC_ELEMENT_TYPE_INT8: {
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i64 result = distance_l1_int8(a, b, &dimensions);
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sqlite3_result_int(context, result);
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goto finish;
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}
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}
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finish:
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aCleanup(a);
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bCleanup(b);
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return;
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}
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static void vec_distance_hamming(sqlite3_context *context, int argc,
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sqlite3_value **argv) {
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assert(argc == 2);
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@ -2608,9 +2792,9 @@ static int vec_npy_eachOpen(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor) {
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static int vec_npy_eachClose(sqlite3_vtab_cursor *cur) {
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vec_npy_each_cursor *pCur = (vec_npy_each_cursor *)cur;
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if (pCur->file) {
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#ifndef SQLITE_VEC_OMIT_FS
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#ifndef SQLITE_VEC_OMIT_FS
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fclose(pCur->file);
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#endif
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#endif
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pCur->file = NULL;
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}
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if (pCur->chunksBuffer) {
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@ -2664,9 +2848,9 @@ static int vec_npy_eachFilter(sqlite3_vtab_cursor *pVtabCursor, int idxNum,
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vec_npy_each_cursor *pCur = (vec_npy_each_cursor *)pVtabCursor;
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if (pCur->file) {
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#ifndef SQLITE_VEC_OMIT_FS
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#ifndef SQLITE_VEC_OMIT_FS
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fclose(pCur->file);
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#endif
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#endif
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pCur->file = NULL;
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}
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if (pCur->chunksBuffer) {
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@ -2679,7 +2863,7 @@ static int vec_npy_eachFilter(sqlite3_vtab_cursor *pVtabCursor, int idxNum,
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struct VecNpyFile *f = NULL;
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#ifndef SQLITE_VEC_OMIT_FS
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#ifndef SQLITE_VEC_OMIT_FS
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if ((f = sqlite3_value_pointer(argv[0], SQLITE_VEC_NPY_FILE_NAME))) {
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FILE *file = fopen(f->path, "r");
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if (!file) {
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@ -2689,15 +2873,15 @@ static int vec_npy_eachFilter(sqlite3_vtab_cursor *pVtabCursor, int idxNum,
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rc = parse_npy_file(pVtabCursor->pVtab, file, pCur);
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if (rc != SQLITE_OK) {
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#ifndef SQLITE_VEC_OMIT_FS
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#ifndef SQLITE_VEC_OMIT_FS
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fclose(file);
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#endif
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#endif
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return rc;
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}
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} else
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#endif
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{
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#endif
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{
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const unsigned char *input = sqlite3_value_blob(argv[0]);
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int inputLength = sqlite3_value_bytes(argv[0]);
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@ -2744,7 +2928,7 @@ static int vec_npy_eachNext(sqlite3_vtab_cursor *cur) {
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return SQLITE_OK;
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}
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#ifndef SQLITE_VEC_OMIT_FS
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#ifndef SQLITE_VEC_OMIT_FS
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// else: input is a file
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pCur->currentChunkIndex++;
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if (pCur->currentChunkIndex >= pCur->currentChunkSize) {
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@ -2757,7 +2941,7 @@ static int vec_npy_eachNext(sqlite3_vtab_cursor *cur) {
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}
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pCur->currentChunkIndex = 0;
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}
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#endif
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#endif
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return SQLITE_OK;
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}
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@ -6658,6 +6842,7 @@ __declspec(dllexport)
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//{"vec_version", _static_text_func, 0, DEFAULT_FLAGS, (void *) SQLITE_VEC_VERSION },
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//{"vec_debug", _static_text_func, 0, DEFAULT_FLAGS, (void *) SQLITE_VEC_DEBUG_STRING },
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{"vec_distance_l2", vec_distance_l2, 2, DEFAULT_FLAGS | SQLITE_SUBTYPE, },
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{"vec_distance_l1", vec_distance_l1, 2, DEFAULT_FLAGS | SQLITE_SUBTYPE, NULL },
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{"vec_distance_hamming",vec_distance_hamming, 2, DEFAULT_FLAGS | SQLITE_SUBTYPE, },
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{"vec_distance_cosine", vec_distance_cosine, 2, DEFAULT_FLAGS | SQLITE_SUBTYPE, },
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{"vec_length", vec_length, 1, DEFAULT_FLAGS | SQLITE_SUBTYPE, },
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