inline void preparePointAdding(PRNearNeighborStructT nnStruct, PUHashStructureT uhash, PPointT point){
ASSERT(nnStruct != NULL);
ASSERT(uhash != NULL);
ASSERT(point != NULL);
//TIMEV_START(timeComputeULSH);
for(IntT d = 0; d < nnStruct->dimension; d++){
nnStruct->reducedPoint[d] = point->coordinates[d] / nnStruct->parameterR;
}
// Compute all ULSH functions.
for(IntT i = 0; i < nnStruct->nHFTuples; i++){
computeULSH(nnStruct, i, nnStruct->reducedPoint, nnStruct->pointULSHVectors[i]);
}
//printIntVector("pointULSHVectors", 10, (int *) nnStruct->pointULSHVectors[0]);
// Compute data for <precomputedHashesOfULSHs>.
if (USE_SAME_UHASH_FUNCTIONS) {
for(IntT i = 0; i < nnStruct->nHFTuples; i++){
//if (i == 0) printIntVector("masterHash", 10, (int*) uhash->mainHashA);
precomputeUHFsForULSH(uhash, nnStruct->pointULSHVectors[i], nnStruct->hfTuplesLength, nnStruct->precomputedHashesOfULSHs[i]);
}
}
//TIMEV_END(timeComputeULSH);
}
inline void preparePointAdding(PRNearNeighborStructT nnStruct, PUHashStructureT uhash, PPointT point)
{
//输入： nnntstuct结构体（降维的向量）， uhash（hash的两个主副向量） 特征点
//操作：先计算点的降维结果，然后计算两个hash索引值 保存到nnStruct->precomputedHashesOfULSHs
//功能，提前计算好每个点的hash表索引值
//根据传入的多维point。
//计算对应每个hash表的降维=》hash值，
//存入了nnStruct->precomputedHashesOfULSHs
ASSERT(nnStruct != NULL);
ASSERT(uhash != NULL);
ASSERT(point != NULL);
TIMEV_START(timeComputeULSH);
for(IntT d = 0; d < nnStruct->dimension; d++) {
nnStruct->reducedPoint[d] = point->coordinates[d] / nnStruct->parameterR;
}
//降维
// Compute all ULSH functions.
for(IntT i = 0; i < nnStruct->nHFTuples; i++) { //nHFTuples是元组个数，
//求出nnStruct->reducedPoint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pointULSHVectors【】 向量上
//pointULSHVectors【i】就是 第一步降维后的向量值
computeULSH(nnStruct, i, nnStruct->reducedPoint, nnStruct->pointULSHVectors[i]);
}
//模hash
// Compute data for <precomputedHashesOfULSHs>.
if (USE_SAME_UHASH_FUNCTIONS) {
for(IntT i = 0; i < nnStruct->nHFTuples; i++) {
precomputeUHFsForULSH(uhash, nnStruct->pointULSHVectors[i], nnStruct->hfTuplesLength, nnStruct->precomputedHashesOfULSHs[i]);
//根据降维后的结果向量：pointULSHVectors【i】 计算两个hash值，存入precomputedHashesOfULSHs【i】
}
}
TIMEV_END(timeComputeULSH);
}
