105 lines
2.8 KiB
C++
105 lines
2.8 KiB
C++
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include <cassert>
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#include <cstdio>
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#include <cstdlib>
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#include <random>
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#include <faiss/IndexPQFastScan.h>
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#include <faiss/IndexRefine.h>
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#include <faiss/index_factory.h>
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using idx_t = faiss::idx_t;
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int main() {
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int d = 64; // dimension
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int nb = 100000; // database size
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int nq = 10000; // nb of queries
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std::mt19937 rng;
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std::uniform_real_distribution<> distrib;
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float* xb = new float[(int)(d * nb)];
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float* xq = new float[(int)(d * nq)];
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for (int i = 0; i < nb; i++) {
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for (int j = 0; j < d; j++) {
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xb[d * i + j] = distrib(rng);
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}
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xb[d * i] += i / 1000.;
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}
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for (int i = 0; i < nq; i++) {
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for (int j = 0; j < d; j++) {
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xq[d * i + j] = distrib(rng);
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}
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xq[d * i] += i / 1000.;
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}
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// Constructing the refine PQ index with SQfp16 with index factory
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faiss::Index* index_fp16;
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index_fp16 = faiss::index_factory(
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d, "PQ32x4fs,Refine(SQfp16)", faiss::METRIC_L2);
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index_fp16->train(nb, xb);
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index_fp16->add(nb, xb);
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// Constructing the refine PQ index with SQ8
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faiss::Index* index_sq8;
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index_sq8 =
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faiss::index_factory(d, "PQ32x4fs,Refine(SQ8)", faiss::METRIC_L2);
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index_sq8->train(nb, xb);
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index_sq8->add(nb, xb);
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int k = 10;
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{ // search xq
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idx_t* I_fp16 = new idx_t[(int)(k * nq)];
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float* D_fp16 = new float[(int)(k * nq)];
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idx_t* I_sq8 = new idx_t[(int)(k * nq)];
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float* D_sq8 = new float[(int)(k * nq)];
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// Parameterization on k factor while doing search for index refinement
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float k_factor = 3;
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faiss::IndexRefineSearchParameters* params =
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new faiss::IndexRefineSearchParameters();
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params->k_factor = k_factor;
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// Perform index search using different index refinement
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index_fp16->search(nq, xq, k, D_fp16, I_fp16, params);
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index_sq8->search(nq, xq, k, D_sq8, I_sq8, params);
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printf("I_fp16=\n");
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for (int i = nq - 5; i < nq; i++) {
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for (int j = 0; j < k; j++) {
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printf("%5zd ", I_fp16[i * k + j]);
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}
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printf("\n");
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}
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printf("I_sq8=\n");
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for (int i = nq - 5; i < nq; i++) {
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for (int j = 0; j < k; j++) {
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printf("%5zd ", I_sq8[i * k + j]);
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}
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printf("\n");
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}
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delete[] I_fp16;
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delete[] D_fp16;
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delete[] I_sq8;
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delete[] D_sq8;
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delete params;
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delete index_fp16;
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delete index_sq8;
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}
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delete[] xb;
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delete[] xq;
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return 0;
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}
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