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a996a4a052
Summary: Pull Request resolved: https://github.com/facebookresearch/faiss/pull/2582 A few more or less cosmetic improvements * Index::idx_t was in the Index object, which does not make much sense, this diff moves it to faiss::idx_t * replace multiprocessing.dummy with multiprocessing.pool * add Alexandr as a core contributor of Faiss in the README ;-) ``` for i in $( find . -name \*.cu -o -name \*.cuh -o -name \*.h -o -name \*.cpp ) ; do sed -i s/Index::idx_t/idx_t/ $i done ``` For the fbcode deps: ``` for i in $( fbgs Index::idx_t --exclude fbcode/faiss -l ) ; do sed -i s/Index::idx_t/idx_t/ $i done ``` Reviewed By: algoriddle Differential Revision: D41437507 fbshipit-source-id: 8300f2a3ae97cace6172f3f14a9be3a83999fb89
102 lines
2.3 KiB
C++
102 lines
2.3 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 <cstdio>
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#include <cstdlib>
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#include <random>
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#include <faiss/IndexFlat.h>
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// 64-bit int
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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[d * nb];
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float* xq = new float[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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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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xq[d * i] += i / 1000.;
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}
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faiss::IndexFlatL2 index(d); // call constructor
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printf("is_trained = %s\n", index.is_trained ? "true" : "false");
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index.add(nb, xb); // add vectors to the index
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printf("ntotal = %zd\n", index.ntotal);
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int k = 4;
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{ // sanity check: search 5 first vectors of xb
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idx_t* I = new idx_t[k * 5];
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float* D = new float[k * 5];
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index.search(5, xb, k, D, I);
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// print results
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printf("I=\n");
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for (int i = 0; i < 5; i++) {
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for (int j = 0; j < k; j++)
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printf("%5zd ", I[i * k + j]);
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printf("\n");
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}
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printf("D=\n");
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for (int i = 0; i < 5; i++) {
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for (int j = 0; j < k; j++)
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printf("%7g ", D[i * k + j]);
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printf("\n");
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}
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delete[] I;
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delete[] D;
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}
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{ // search xq
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idx_t* I = new idx_t[k * nq];
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float* D = new float[k * nq];
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index.search(nq, xq, k, D, I);
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// print results
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printf("I (5 first results)=\n");
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for (int i = 0; i < 5; i++) {
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for (int j = 0; j < k; j++)
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printf("%5zd ", I[i * k + j]);
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printf("\n");
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}
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printf("I (5 last results)=\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[i * k + j]);
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printf("\n");
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}
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delete[] I;
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delete[] D;
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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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