// Compute the value of a hash function u=lshFunctions[gNumber] (a
// vector of <hfTuplesLength> LSH functions) in the point <point>. The
// result is stored in the vector <vectorValue>. <vectorValue> must be
// already allocated (and have space for <hfTuplesLength> Uns32T-words).
inline void computeULSH(PRNearNeighborStructT nnStruct, IntT gNumber, RealT *point, Uns32T *vectorValue){
CR_ASSERT(nnStruct != NULL);
CR_ASSERT(point != NULL);
CR_ASSERT(vectorValue != NULL);
for(IntT i = 0; i < nnStruct->hfTuplesLength; i++){
RealT value = 0;
for(IntT d = 0; d < nnStruct->dimension; d++){
value += point[d] * nnStruct->lshFunctions[gNumber][i].a[d];
}
vectorValue[i] = (Uns32T)(FLOOR_INT32((value + nnStruct->lshFunctions[gNumber][i].b) / nnStruct->parameterW) /* - MIN_INT32T*/);
}
}
// Compute the value of a hash function u=lshFunctions[gNumber] (a
// vector of <hfTuplesLength> LSH functions) in the point <point>. The
// result is stored in the vector <vectorValue>. <vectorValue> must be
// already allocated (and have space for <hfTuplesLength> Uns32T-words).
inline void computeULSH(PRNearNeighborStructT nnStruct, IntT gNumber, RealT *point, Uns32T *vectorValue)
{ //求出point向量和多个hansh映射后的值， 对于每个hash： a。v+b 除以 r
//结果返回到vectorValue 向量上
CR_ASSERT(nnStruct != NULL);
CR_ASSERT(point != NULL);
CR_ASSERT(vectorValue != NULL);
// FILE *file=fopen("vector.txt","a+");
// fprintf(file,"\n\n");
for(IntT i = 0; i < nnStruct->hfTuplesLength; i++) {
RealT value = 0;
for(IntT d = 0; d < nnStruct->dimension; d++) {
value += point[d] * nnStruct->lshFunctions[gNumber][i].a[d];
//两个向量point[]。第gnumber的hash向量 点乘 ； 就是a。v
}
value=value*97;//放大10倍看看
double tempv=( (value + nnStruct->lshFunctions[gNumber][i].b) );
double temp_w=tempv/ nnStruct->parameterW ;
int vi=temp_w;
if ( vi < 0)
{
vi+=1793;
}
vectorValue[i] = (Uns32T)(FLOOR_INT32( (value + nnStruct->lshFunctions[gNumber][i].b) / nnStruct->parameterW )) ;
vectorValue[i] =vi;
// fprintf(file,"%lf %lf %d ||",value,temp_w ,vi );
// vectorValue[i] = (Uns32T)(FLOOR_INT32( (value + nnStruct->lshFunctions[gNumber][i].b) / nnStruct->parameterW) /* - MIN_INT32T*/);
//a。v+b 除以 r
}
// fclose(file);
}
