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IP space roundup bug fix #361

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Merged
merged 1 commit into from
Feb 14, 2022
Merged

IP space roundup bug fix #361

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84 changes: 61 additions & 23 deletions hnswlib/space_ip.h
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Original file line number Diff line number Diff line change
Expand Up @@ -10,10 +10,15 @@ namespace hnswlib {
for (unsigned i = 0; i < qty; i++) {
res += ((float *) pVect1)[i] * ((float *) pVect2)[i];
}
return (1.0f - res);
return res;

}

static float
InnerProductDistance(const void *pVect1, const void *pVect2, const void *qty_ptr) {
return 1.0f - InnerProduct(pVect1, pVect2, qty_ptr);
}

#if defined(USE_AVX)

// Favor using AVX if available.
Expand Down Expand Up @@ -61,8 +66,13 @@ namespace hnswlib {

_mm_store_ps(TmpRes, sum_prod);
float sum = TmpRes[0] + TmpRes[1] + TmpRes[2] + TmpRes[3];;
return 1.0f - sum;
}
return sum;
}

static float
InnerProductDistanceSIMD4ExtAVX(const void *pVect1v, const void *pVect2v, const void *qty_ptr) {
return 1.0f - InnerProductSIMD4ExtAVX(pVect1v, pVect2v, qty_ptr);
}

#endif

Expand Down Expand Up @@ -121,7 +131,12 @@ namespace hnswlib {
_mm_store_ps(TmpRes, sum_prod);
float sum = TmpRes[0] + TmpRes[1] + TmpRes[2] + TmpRes[3];

return 1.0f - sum;
return sum;
}

static float
InnerProductDistanceSIMD4ExtSSE(const void *pVect1v, const void *pVect2v, const void *qty_ptr) {
return 1.0f - InnerProductSIMD4ExtSSE(pVect1v, pVect2v, qty_ptr);
}

#endif
Expand Down Expand Up @@ -156,7 +171,12 @@ namespace hnswlib {
_mm512_store_ps(TmpRes, sum512);
float sum = TmpRes[0] + TmpRes[1] + TmpRes[2] + TmpRes[3] + TmpRes[4] + TmpRes[5] + TmpRes[6] + TmpRes[7] + TmpRes[8] + TmpRes[9] + TmpRes[10] + TmpRes[11] + TmpRes[12] + TmpRes[13] + TmpRes[14] + TmpRes[15];

return 1.0f - sum;
return sum;
}

static float
InnerProductDistanceSIMD16ExtAVX512(const void *pVect1v, const void *pVect2v, const void *qty_ptr) {
return 1.0f - InnerProductSIMD16ExtAVX512(pVect1v, pVect2v, qty_ptr);
}

#endif
Expand Down Expand Up @@ -196,15 +216,20 @@ namespace hnswlib {
_mm256_store_ps(TmpRes, sum256);
float sum = TmpRes[0] + TmpRes[1] + TmpRes[2] + TmpRes[3] + TmpRes[4] + TmpRes[5] + TmpRes[6] + TmpRes[7];

return 1.0f - sum;
return sum;
}

static float
InnerProductDistanceSIMD16ExtAVX(const void *pVect1v, const void *pVect2v, const void *qty_ptr) {
return 1.0f - InnerProductSIMD16ExtAVX(pVect1v, pVect2v, qty_ptr);
}

#endif

#if defined(USE_SSE)

static float
InnerProductSIMD16ExtSSE(const void *pVect1v, const void *pVect2v, const void *qty_ptr) {
static float
InnerProductSIMD16ExtSSE(const void *pVect1v, const void *pVect2v, const void *qty_ptr) {
float PORTABLE_ALIGN32 TmpRes[8];
float *pVect1 = (float *) pVect1v;
float *pVect2 = (float *) pVect2v;
Expand Down Expand Up @@ -245,17 +270,24 @@ namespace hnswlib {
_mm_store_ps(TmpRes, sum_prod);
float sum = TmpRes[0] + TmpRes[1] + TmpRes[2] + TmpRes[3];

return 1.0f - sum;
return sum;
}

static float
InnerProductDistanceSIMD16ExtSSE(const void *pVect1v, const void *pVect2v, const void *qty_ptr) {
return 1.0f - InnerProductSIMD16ExtSSE(pVect1v, pVect2v, qty_ptr);
}

#endif

#if defined(USE_SSE) || defined(USE_AVX) || defined(USE_AVX512)
DISTFUNC<float> InnerProductSIMD16Ext = InnerProductSIMD16ExtSSE;
DISTFUNC<float> InnerProductSIMD4Ext = InnerProductSIMD4ExtSSE;
DISTFUNC<float> InnerProductDistanceSIMD16Ext = InnerProductDistanceSIMD16ExtSSE;
DISTFUNC<float> InnerProductDistanceSIMD4Ext = InnerProductDistanceSIMD4ExtSSE;

static float
InnerProductSIMD16ExtResiduals(const void *pVect1v, const void *pVect2v, const void *qty_ptr) {
InnerProductDistanceSIMD16ExtResiduals(const void *pVect1v, const void *pVect2v, const void *qty_ptr) {
size_t qty = *((size_t *) qty_ptr);
size_t qty16 = qty >> 4 << 4;
float res = InnerProductSIMD16Ext(pVect1v, pVect2v, &qty16);
Expand All @@ -264,11 +296,11 @@ namespace hnswlib {

size_t qty_left = qty - qty16;
float res_tail = InnerProduct(pVect1, pVect2, &qty_left);
return res + res_tail - 1.0f;
return 1.0f - (res + res_tail);
}

static float
InnerProductSIMD4ExtResiduals(const void *pVect1v, const void *pVect2v, const void *qty_ptr) {
InnerProductDistanceSIMD4ExtResiduals(const void *pVect1v, const void *pVect2v, const void *qty_ptr) {
size_t qty = *((size_t *) qty_ptr);
size_t qty4 = qty >> 2 << 2;

Expand All @@ -279,7 +311,7 @@ namespace hnswlib {
float *pVect2 = (float *) pVect2v + qty4;
float res_tail = InnerProduct(pVect1, pVect2, &qty_left);

return res + res_tail - 1.0f;
return 1.0f - (res + res_tail);
}
#endif

Expand All @@ -290,30 +322,37 @@ namespace hnswlib {
size_t dim_;
public:
InnerProductSpace(size_t dim) {
fstdistfunc_ = InnerProduct;
fstdistfunc_ = InnerProductDistance;
#if defined(USE_AVX) || defined(USE_SSE) || defined(USE_AVX512)
#if defined(USE_AVX512)
if (AVX512Capable())
if (AVX512Capable()) {
InnerProductSIMD16Ext = InnerProductSIMD16ExtAVX512;
else if (AVXCapable())
InnerProductDistanceSIMD16Ext = InnerProductDistanceSIMD16ExtAVX512;
} else if (AVXCapable()) {
InnerProductSIMD16Ext = InnerProductSIMD16ExtAVX;
InnerProductDistanceSIMD16Ext = InnerProductDistanceSIMD16ExtAVX;
}
#elif defined(USE_AVX)
if (AVXCapable())
if (AVXCapable()) {
InnerProductSIMD16Ext = InnerProductSIMD16ExtAVX;
InnerProductDistanceSIMD16Ext = InnerProductDistanceSIMD16ExtAVX;
}
#endif
#if defined(USE_AVX)
if (AVXCapable())
if (AVXCapable()) {
InnerProductSIMD4Ext = InnerProductSIMD4ExtAVX;
InnerProductDistanceSIMD4Ext = InnerProductDistanceSIMD4ExtAVX;
}
#endif

if (dim % 16 == 0)
fstdistfunc_ = InnerProductSIMD16Ext;
fstdistfunc_ = InnerProductDistanceSIMD16Ext;
else if (dim % 4 == 0)
fstdistfunc_ = InnerProductSIMD4Ext;
fstdistfunc_ = InnerProductDistanceSIMD4Ext;
else if (dim > 16)
fstdistfunc_ = InnerProductSIMD16ExtResiduals;
fstdistfunc_ = InnerProductDistanceSIMD16ExtResiduals;
else if (dim > 4)
fstdistfunc_ = InnerProductSIMD4ExtResiduals;
fstdistfunc_ = InnerProductDistanceSIMD4ExtResiduals;
#endif
dim_ = dim;
data_size_ = dim * sizeof(float);
Expand All @@ -334,5 +373,4 @@ namespace hnswlib {
~InnerProductSpace() {}
};


}