Struct faiss::ivflib::SlidingIndexWindow

struct faiss::ivflib::SlidingIndexWindow

A set of IndexIVFs concatenated together in a FIFO fashion. at each “step”, the oldest index slice is removed and a new index is added.

Public Functions

SlidingIndexWindow(Index *index)

index should be initially empty and trained

void step(const Index *sub_index, bool remove_oldest)

Add one index to the current index and remove the oldest one.

  • sub_index – slice to swap in (can be NULL)

  • remove_oldest – if true, remove the oldest slices

Public Members

Index *index

common index that contains the sliding window

ArrayInvertedLists *ils

InvertedLists of index.

int n_slice

number of slices currently in index

size_t nlist

same as index->nlist

std::vector<std::vector<size_t>> sizes

cumulative list sizes at each slice