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/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#include <cstdio>
#include <cstdlib>
#include <memory>
#include <gtest/gtest.h>
#include <faiss/AutoTune.h>
#include <faiss/IVFlib.h>
#include <faiss/IndexIVFFlat.h>
#include <faiss/clone_index.h>
#include <faiss/impl/io.h>
#include <faiss/index_factory.h>
#include <faiss/index_io.h>
#include <faiss/utils/random.h>
namespace {
// parameters to use for the test
int d = 64;
size_t nb = 1000;
size_t nq = 100;
size_t nt = 500;
int k = 10;
int nlist = 40;
using namespace faiss;
using idx_t = faiss::idx_t;
std::vector<float> get_data(size_t nb, int seed) {
std::vector<float> x(nb * d);
float_randn(x.data(), nb * d, seed);
return x;
}
void test_index_type(const char* factory_string) {
// transfer inverted lists in nslice slices
int nslice = 3;
/****************************************************************
* trained reference index
****************************************************************/
std::unique_ptr<Index> trained(index_factory(d, factory_string));
{
auto xt = get_data(nt, 123);
trained->train(nt, xt.data());
}
// sample nq query vectors to check if results are the same
auto xq = get_data(nq, 818);
/****************************************************************
* source index
***************************************************************/
std::unique_ptr<Index> src_index(clone_index(trained.get()));
{ // add some data to source index
auto xb = get_data(nb, 245);
src_index->add(nb, xb.data());
}
ParameterSpace().set_index_parameter(src_index.get(), "nprobe", 4);
// remember reference search result on source index
std::vector<idx_t> Iref(nq * k);
std::vector<float> Dref(nq * k);
src_index->search(nq, xq.data(), k, Dref.data(), Iref.data());
/****************************************************************
* destination index -- should be replaced by source index
***************************************************************/
std::unique_ptr<Index> dst_index(clone_index(trained.get()));
{ // initial state: filled in with some garbage
int nb2 = nb + 10;
auto xb = get_data(nb2, 366);
dst_index->add(nb2, xb.data());
}
std::vector<idx_t> Inew(nq * k);
std::vector<float> Dnew(nq * k);
ParameterSpace().set_index_parameter(dst_index.get(), "nprobe", 4);
// transfer from source to destination in nslice slices
for (int sl = 0; sl < nslice; sl++) {
// so far, the indexes are different
dst_index->search(nq, xq.data(), k, Dnew.data(), Inew.data());
EXPECT_TRUE(Iref != Inew);
EXPECT_TRUE(Dref != Dnew);
// range of inverted list indices to transfer
long i0 = sl * nlist / nslice;
long i1 = (sl + 1) * nlist / nslice;
std::vector<uint8_t> data_to_transfer;
{
std::unique_ptr<ArrayInvertedLists> il(
ivflib::get_invlist_range(src_index.get(), i0, i1));
// serialize inverted lists
VectorIOWriter wr;
write_InvertedLists(il.get(), &wr);
data_to_transfer.swap(wr.data);
}
// transfer data here from source machine to dest machine
{
VectorIOReader reader;
reader.data.swap(data_to_transfer);
// deserialize inverted lists
std::unique_ptr<ArrayInvertedLists> il(
dynamic_cast<ArrayInvertedLists*>(
read_InvertedLists(&reader)));
// swap inverted lists. Block searches here!
{ ivflib::set_invlist_range(dst_index.get(), i0, i1, il.get()); }
}
}
EXPECT_EQ(dst_index->ntotal, src_index->ntotal);
// now, the indexes are the same
dst_index->search(nq, xq.data(), k, Dnew.data(), Inew.data());
EXPECT_TRUE(Iref == Inew);
EXPECT_TRUE(Dref == Dnew);
}
} // namespace
TEST(TRANS, IVFFlat) {
test_index_type("IVF40,Flat");
}
TEST(TRANS, IVFFlatPreproc) {
test_index_type("PCAR32,IVF40,Flat");
}
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