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TestGpuIndexIVFFlat.cpp
/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD+Patents license found in the
* LICENSE file in the root directory of this source tree.
*/
// Copyright 2004-present Facebook. All Rights Reserved.
#include "../../IndexFlat.h"
#include "../../IndexIVF.h"
#include "../GpuIndexIVFFlat.h"
#include "../StandardGpuResources.h"
#include "../utils/DeviceUtils.h"
#include "../test/TestUtils.h"
#include <gtest/gtest.h>
#include <glog/logging.h>
#include <sstream>
#include <vector>
// FIXME: figure out a better way to test fp16
constexpr float kF16MaxRelErr = 0.3f;
constexpr float kF32MaxRelErr = 0.03f;
struct Options {
Options() {
numAdd = faiss::gpu::randVal(4000, 20000);
dim = faiss::gpu::randVal(64, 200);
numCentroids = std::sqrt((float) numAdd);
numTrain = numCentroids * 40;
nprobe = faiss::gpu::randVal(10, numCentroids);
numQuery = faiss::gpu::randVal(32, 100);
k = std::min(faiss::gpu::randVal(10, 30), numAdd / 40);
indicesOpt = faiss::gpu::randSelect({
faiss::gpu::INDICES_CPU,
faiss::gpu::INDICES_32_BIT,
faiss::gpu::INDICES_64_BIT});
device = faiss::gpu::randVal(0, faiss::gpu::getNumDevices() - 1);
}
std::string toString() const {
std::stringstream str;
str << "IVFFlat device " << device
<< " numVecs " << numAdd
<< " dim " << dim
<< " numCentroids " << numCentroids
<< " nprobe " << nprobe
<< " numQuery " << numQuery
<< " k " << k
<< " indicesOpt " << indicesOpt;
return str.str();
}
int numAdd;
int dim;
int numCentroids;
int numTrain;
int nprobe;
int numQuery;
int k;
int device;
faiss::gpu::IndicesOptions indicesOpt;
};
void queryTest(faiss::MetricType metricType,
bool useFloat16CoarseQuantizer,
bool useFloat16,
int dimOverride = -1) {
for (int tries = 0; tries < 3; ++tries) {
faiss::gpu::newTestSeed();
Options opt;
opt.dim = dimOverride != -1 ? dimOverride : opt.dim;
std::vector<float> trainVecs = faiss::gpu::randVecs(opt.numTrain, opt.dim);
std::vector<float> addVecs = faiss::gpu::randVecs(opt.numAdd, opt.dim);
faiss::IndexFlatL2 quantizerL2(opt.dim);
faiss::IndexFlatIP quantizerIP(opt.dim);
faiss::Index* quantizer =
metricType == faiss::METRIC_L2 ?
(faiss::Index*) &quantizerL2 : (faiss::Index*) &quantizerIP;
faiss::IndexIVFFlat cpuIndex(quantizer,
opt.dim, opt.numCentroids, metricType);
cpuIndex.train(opt.numTrain, trainVecs.data());
cpuIndex.add(opt.numAdd, addVecs.data());
cpuIndex.nprobe = opt.nprobe;
faiss::gpu::StandardGpuResources res;
res.noTempMemory();
faiss::gpu::GpuIndexIVFFlatConfig config;
config.device = opt.device;
config.indicesOptions = opt.indicesOpt;
config.flatConfig.useFloat16 = useFloat16CoarseQuantizer;
config.useFloat16IVFStorage = useFloat16;
faiss::gpu::GpuIndexIVFFlat gpuIndex(&res,
cpuIndex.d,
cpuIndex.nlist,
cpuIndex.metric_type,
config);
gpuIndex.copyFrom(&cpuIndex);
gpuIndex.setNumProbes(opt.nprobe);
bool compFloat16 = useFloat16CoarseQuantizer || useFloat16;
faiss::gpu::compareIndices(cpuIndex, gpuIndex,
opt.numQuery, opt.dim, opt.k, opt.toString(),
compFloat16 ? kF16MaxRelErr : kF32MaxRelErr,
// FIXME: the fp16 bounds are
// useless when math (the accumulator) is
// in fp16. Figure out another way to test
compFloat16 ? 0.99f : 0.1f,
compFloat16 ? 0.65f : 0.015f);
}
}
void addTest(faiss::MetricType metricType,
bool useFloat16CoarseQuantizer,
bool useFloat16) {
for (int tries = 0; tries < 5; ++tries) {
faiss::gpu::newTestSeed();
Options opt;
std::vector<float> trainVecs = faiss::gpu::randVecs(opt.numTrain, opt.dim);
std::vector<float> addVecs = faiss::gpu::randVecs(opt.numAdd, opt.dim);
faiss::IndexFlatL2 quantizerL2(opt.dim);
faiss::IndexFlatIP quantizerIP(opt.dim);
faiss::Index* quantizer =
metricType == faiss::METRIC_L2 ?
(faiss::Index*) &quantizerL2 : (faiss::Index*) &quantizerIP;
faiss::IndexIVFFlat cpuIndex(quantizer,
opt.dim,
opt.numCentroids,
metricType);
cpuIndex.train(opt.numTrain, trainVecs.data());
cpuIndex.nprobe = opt.nprobe;
faiss::gpu::StandardGpuResources res;
res.noTempMemory();
faiss::gpu::GpuIndexIVFFlatConfig config;
config.device = opt.device;
config.indicesOptions = opt.indicesOpt;
config.flatConfig.useFloat16 = useFloat16CoarseQuantizer;
config.useFloat16IVFStorage = useFloat16;
faiss::gpu::GpuIndexIVFFlat gpuIndex(&res,
cpuIndex.d,
cpuIndex.nlist,
cpuIndex.metric_type,
config);
gpuIndex.copyFrom(&cpuIndex);
gpuIndex.setNumProbes(opt.nprobe);
cpuIndex.add(opt.numAdd, addVecs.data());
gpuIndex.add(opt.numAdd, addVecs.data());
bool compFloat16 = useFloat16CoarseQuantizer || useFloat16;
faiss::gpu::compareIndices(cpuIndex, gpuIndex,
opt.numQuery, opt.dim, opt.k, opt.toString(),
compFloat16 ? kF16MaxRelErr : kF32MaxRelErr,
compFloat16 ? 0.70f : 0.1f,
compFloat16 ? 0.30f : 0.015f);
}
}
void copyToTest(bool useFloat16CoarseQuantizer,
bool useFloat16) {
faiss::gpu::newTestSeed();
Options opt;
std::vector<float> trainVecs = faiss::gpu::randVecs(opt.numTrain, opt.dim);
std::vector<float> addVecs = faiss::gpu::randVecs(opt.numAdd, opt.dim);
faiss::gpu::StandardGpuResources res;
res.noTempMemory();
faiss::gpu::GpuIndexIVFFlatConfig config;
config.device = opt.device;
config.indicesOptions = opt.indicesOpt;
config.flatConfig.useFloat16 = useFloat16CoarseQuantizer;
config.useFloat16IVFStorage = useFloat16;
faiss::gpu::GpuIndexIVFFlat gpuIndex(&res,
opt.dim,
opt.numCentroids,
faiss::METRIC_L2,
config);
gpuIndex.train(opt.numTrain, trainVecs.data());
gpuIndex.add(opt.numAdd, addVecs.data());
gpuIndex.setNumProbes(opt.nprobe);
// use garbage values to see if we overwrite then
faiss::IndexFlatL2 cpuQuantizer(1);
faiss::IndexIVFFlat cpuIndex(&cpuQuantizer, 1, 1, faiss::METRIC_L2);
cpuIndex.nprobe = 1;
gpuIndex.copyTo(&cpuIndex);
EXPECT_EQ(cpuIndex.ntotal, gpuIndex.ntotal);
EXPECT_EQ(gpuIndex.ntotal, opt.numAdd);
EXPECT_EQ(cpuIndex.d, gpuIndex.d);
EXPECT_EQ(cpuIndex.d, opt.dim);
EXPECT_EQ(cpuIndex.nlist, gpuIndex.getNumLists());
EXPECT_EQ(cpuIndex.nprobe, gpuIndex.getNumProbes());
// Query both objects; results should be equivalent
bool compFloat16 = useFloat16CoarseQuantizer || useFloat16;
faiss::gpu::compareIndices(cpuIndex, gpuIndex,
opt.numQuery, opt.dim, opt.k, opt.toString(),
compFloat16 ? kF16MaxRelErr : kF32MaxRelErr,
compFloat16 ? 0.70f : 0.1f,
compFloat16 ? 0.30f : 0.015f);
}
void copyFromTest(bool useFloat16CoarseQuantizer,
bool useFloat16) {
faiss::gpu::newTestSeed();
Options opt;
std::vector<float> trainVecs = faiss::gpu::randVecs(opt.numTrain, opt.dim);
std::vector<float> addVecs = faiss::gpu::randVecs(opt.numAdd, opt.dim);
faiss::IndexFlatL2 cpuQuantizer(opt.dim);
faiss::IndexIVFFlat cpuIndex(&cpuQuantizer,
opt.dim,
opt.numCentroids,
faiss::METRIC_L2);
cpuIndex.nprobe = opt.nprobe;
cpuIndex.train(opt.numTrain, trainVecs.data());
cpuIndex.add(opt.numAdd, addVecs.data());
// use garbage values to see if we overwrite then
faiss::gpu::StandardGpuResources res;
res.noTempMemory();
faiss::gpu::GpuIndexIVFFlatConfig config;
config.device = opt.device;
config.indicesOptions = opt.indicesOpt;
config.flatConfig.useFloat16 = useFloat16CoarseQuantizer;
config.useFloat16IVFStorage = useFloat16;
faiss::gpu::GpuIndexIVFFlat gpuIndex(&res,
1,
1,
faiss::METRIC_L2,
config);
gpuIndex.setNumProbes(1);
gpuIndex.copyFrom(&cpuIndex);
EXPECT_EQ(cpuIndex.ntotal, gpuIndex.ntotal);
EXPECT_EQ(gpuIndex.ntotal, opt.numAdd);
EXPECT_EQ(cpuIndex.d, gpuIndex.d);
EXPECT_EQ(cpuIndex.d, opt.dim);
EXPECT_EQ(cpuIndex.nlist, gpuIndex.getNumLists());
EXPECT_EQ(cpuIndex.nprobe, gpuIndex.getNumProbes());
// Query both objects; results should be equivalent
bool compFloat16 = useFloat16CoarseQuantizer || useFloat16;
faiss::gpu::compareIndices(cpuIndex, gpuIndex,
opt.numQuery, opt.dim, opt.k, opt.toString(),
compFloat16 ? kF16MaxRelErr : kF32MaxRelErr,
compFloat16 ? 0.70f : 0.1f,
compFloat16 ? 0.30f : 0.015f);
}
TEST(TestGpuIndexIVFFlat, Float32_32_Add_L2) {
addTest(faiss::METRIC_L2, false, false);
}
TEST(TestGpuIndexIVFFlat, Float32_32_Add_IP) {
addTest(faiss::METRIC_INNER_PRODUCT, false, false);
}
TEST(TestGpuIndexIVFFlat, Float32_16_Add_L2) {
addTest(faiss::METRIC_L2, false, true);
}
TEST(TestGpuIndexIVFFlat, Float32_16_Add_IP) {
addTest(faiss::METRIC_INNER_PRODUCT, false, true);
}
TEST(TestGpuIndexIVFFlat, Float16_32_Add_L2) {
addTest(faiss::METRIC_L2, true, false);
}
TEST(TestGpuIndexIVFFlat, Float16_32_Add_IP) {
addTest(faiss::METRIC_INNER_PRODUCT, true, false);
}
//
// General query tests
//
TEST(TestGpuIndexIVFFlat, Float32_Query_L2) {
queryTest(faiss::METRIC_L2, false, false);
}
TEST(TestGpuIndexIVFFlat, Float32_Query_IP) {
queryTest(faiss::METRIC_INNER_PRODUCT, false, false);
}
TEST(TestGpuIndexIVFFlat, Float16_Query_L2) {
queryTest(faiss::METRIC_L2, false, true);
}
TEST(TestGpuIndexIVFFlat, Float16_Query_IP) {
queryTest(faiss::METRIC_INNER_PRODUCT, false, true);
}
// float16 coarse quantizer
TEST(TestGpuIndexIVFFlat, Float16_32_Query_L2) {
queryTest(faiss::METRIC_L2, true, false);
}
TEST(TestGpuIndexIVFFlat, Float16_32_Query_IP) {
queryTest(faiss::METRIC_INNER_PRODUCT, true, false);
}
//
// There are IVF list scanning specializations for 64-d and 128-d that we
// make sure we explicitly test here
//
TEST(TestGpuIndexIVFFlat, Float32_Query_L2_64) {
queryTest(faiss::METRIC_L2, false, false, 64);
}
TEST(TestGpuIndexIVFFlat, Float32_Query_IP_64) {
queryTest(faiss::METRIC_INNER_PRODUCT, false, false, 64);
}
TEST(TestGpuIndexIVFFlat, Float16_Query_L2_64) {
queryTest(faiss::METRIC_L2, false, true, 64);
}
TEST(TestGpuIndexIVFFlat, Float16_Query_IP_64) {
queryTest(faiss::METRIC_INNER_PRODUCT, false, true, 64);
}
TEST(TestGpuIndexIVFFlat, Float32_Query_L2_128) {
queryTest(faiss::METRIC_L2, false, false, 128);
}
TEST(TestGpuIndexIVFFlat, Float32_Query_IP_128) {
queryTest(faiss::METRIC_INNER_PRODUCT, false, false, 128);
}
TEST(TestGpuIndexIVFFlat, Float16_Query_L2_128) {
queryTest(faiss::METRIC_L2, false, true, 128);
}
TEST(TestGpuIndexIVFFlat, Float16_Query_IP_128) {
queryTest(faiss::METRIC_INNER_PRODUCT, false, true, 128);
}
// For 256-d, only float16 is specialized
TEST(TestGpuIndexIVFFlat, Float16_Query_L2_256) {
queryTest(faiss::METRIC_L2, false, true, 256);
}
TEST(TestGpuIndexIVFFlat, Float16_Query_IP_256) {
queryTest(faiss::METRIC_INNER_PRODUCT, false, true, 256);
}
//
// Copy tests
//
TEST(TestGpuIndexIVFFlat, Float32_16_CopyTo) {
copyToTest(false, true);
}
TEST(TestGpuIndexIVFFlat, Float32_32_CopyTo) {
copyToTest(false, false);
}
//
// NaN tests
//
TEST(TestGpuIndexIVFFlat, QueryNaN) {
faiss::gpu::newTestSeed();
Options opt;
std::vector<float> trainVecs = faiss::gpu::randVecs(opt.numTrain, opt.dim);
std::vector<float> addVecs = faiss::gpu::randVecs(opt.numAdd, opt.dim);
faiss::gpu::StandardGpuResources res;
res.noTempMemory();
faiss::gpu::GpuIndexIVFFlatConfig config;
config.device = opt.device;
config.indicesOptions = opt.indicesOpt;
config.flatConfig.useFloat16 = faiss::gpu::randBool();
config.useFloat16IVFStorage = faiss::gpu::randBool();
faiss::gpu::GpuIndexIVFFlat gpuIndex(&res,
opt.dim,
opt.numCentroids,
faiss::METRIC_L2,
config);
gpuIndex.setNumProbes(opt.nprobe);
gpuIndex.train(opt.numTrain, trainVecs.data());
gpuIndex.add(opt.numAdd, addVecs.data());
int numQuery = 10;
std::vector<float> nans(numQuery * opt.dim,
std::numeric_limits<float>::quiet_NaN());
std::vector<float> distances(numQuery * opt.k, 0);
std::vector<faiss::Index::idx_t> indices(numQuery * opt.k, 0);
gpuIndex.search(numQuery,
nans.data(),
opt.k,
distances.data(),
indices.data());
for (int q = 0; q < numQuery; ++q) {
for (int k = 0; k < opt.k; ++k) {
EXPECT_EQ(indices[q * opt.k + k], -1);
EXPECT_EQ(distances[q * opt.k + k], std::numeric_limits<float>::max());
}
}
}
TEST(TestGpuIndexIVFFlat, AddNaN) {
faiss::gpu::newTestSeed();
Options opt;
faiss::gpu::StandardGpuResources res;
res.noTempMemory();
faiss::gpu::GpuIndexIVFFlatConfig config;
config.device = opt.device;
config.indicesOptions = opt.indicesOpt;
config.flatConfig.useFloat16 = faiss::gpu::randBool();
config.useFloat16IVFStorage = faiss::gpu::randBool();
faiss::gpu::GpuIndexIVFFlat gpuIndex(&res,
opt.dim,
opt.numCentroids,
faiss::METRIC_L2,
config);
gpuIndex.setNumProbes(opt.nprobe);
int numNans = 10;
std::vector<float> nans(numNans * opt.dim,
std::numeric_limits<float>::quiet_NaN());
// Make one vector valid, which should actually add
for (int i = 0; i < opt.dim; ++i) {
nans[i] = 0.0f;
}
std::vector<float> trainVecs = faiss::gpu::randVecs(opt.numTrain, opt.dim);
gpuIndex.train(opt.numTrain, trainVecs.data());
// should not crash
EXPECT_EQ(gpuIndex.ntotal, 0);
gpuIndex.add(numNans, nans.data());
// Only the single valid vector should have added
EXPECT_EQ(gpuIndex.ntotal, 1);
std::vector<float> queryVecs = faiss::gpu::randVecs(opt.numQuery, opt.dim);
std::vector<float> distance(opt.numQuery * opt.k, 0);
std::vector<faiss::Index::idx_t> indices(opt.numQuery * opt.k, 0);
// should not crash
gpuIndex.search(opt.numQuery, queryVecs.data(), opt.k,
distance.data(), indices.data());
}
TEST(TestGpuIndexIVFFlat, UnifiedMemory) {
// Construct on a random device to test multi-device, if we have
// multiple devices
int device = faiss::gpu::randVal(0, faiss::gpu::getNumDevices() - 1);
if (!faiss::gpu::getFullUnifiedMemSupport(device)) {
return;
}
int dim = 256;
int numCentroids = 1024;
// 24 GB of vecs should be enough to test unified memory in
// oversubscription mode
size_t numAdd =
(size_t) 1024 * 1024 * 1024 * 24 / ((size_t) dim * sizeof(float));
size_t numTrain = numCentroids * 40;
int numQuery = 10;
int k = 10;
int nprobe = 8;
LOG(INFO) << "generating vecs";
std::vector<float> trainVecs = faiss::gpu::randVecs(numTrain, dim);
std::vector<float> addVecs = faiss::gpu::randVecs(numAdd, dim);
LOG(INFO) << "train CPU";
faiss::IndexFlatL2 quantizer(dim);
faiss::IndexIVFFlat cpuIndex(&quantizer, dim, numCentroids, faiss::METRIC_L2);
LOG(INFO) << "train CPU";
cpuIndex.train(numTrain, trainVecs.data());
LOG(INFO) << "add CPU";
cpuIndex.add(numAdd, addVecs.data());
cpuIndex.nprobe = nprobe;
faiss::gpu::StandardGpuResources res;
res.noTempMemory();
faiss::gpu::GpuIndexIVFFlatConfig config;
config.device = device;
config.memorySpace = faiss::gpu::MemorySpace::Unified;
faiss::gpu::GpuIndexIVFFlat gpuIndex(&res,
dim,
numCentroids,
faiss::METRIC_L2,
config);
LOG(INFO) << "copy from CPU";
gpuIndex.copyFrom(&cpuIndex);
gpuIndex.setNumProbes(nprobe);
LOG(INFO) << "compare";
faiss::gpu::compareIndices(cpuIndex, gpuIndex,
numQuery, dim, k, "Unified Memory",
kF32MaxRelErr,
0.1f,
0.015f);
}
faiss::gpu::StandardGpuResources::noTempMemory
void noTempMemory()
Definition: StandardGpuResources.cpp:76
faiss::IndexFlatL2
Definition: IndexFlat.h:79
faiss::gpu::GpuIndexIVFFlatConfig::useFloat16IVFStorage
bool useFloat16IVFStorage
Definition: GpuIndexIVFFlat.h:29
faiss::IndexIVFFlat
Definition: IndexIVF.h:132
faiss::IndexFlatIP
Definition: IndexFlat.h:73
faiss::gpu::GpuIndexFlatConfig::useFloat16
bool useFloat16
Whether or not data is stored as float16.
Definition: GpuIndexFlat.h:35
faiss::gpu::GpuIndexConfig::device
int device
GPU device on which the index is resident.
Definition: GpuIndex.h:27
faiss::gpu::GpuIndexIVFConfig::flatConfig
GpuIndexFlatConfig flatConfig
Configuration for the coarse quantizer object.
Definition: GpuIndexIVF.h:34
faiss::gpu::GpuIndexConfig::memorySpace
MemorySpace memorySpace
Definition: GpuIndex.h:32
faiss::gpu::StandardGpuResources
Definition: StandardGpuResources.h:23
faiss::Index
Definition: Index.h:60
faiss::gpu::GpuIndexIVFFlatConfig
Definition: GpuIndexIVFFlat.h:22
faiss::gpu::GpuIndexIVFConfig::indicesOptions
IndicesOptions indicesOptions
Index storage options for the GPU.
Definition: GpuIndexIVF.h:31
Options
Definition: TestGpuIndexIVFFlat.cpp:27
faiss::gpu::GpuIndexIVFFlat
Definition: GpuIndexIVFFlat.h:34
faiss::MetricType
MetricType
Some algorithms support both an inner product vetsion and a L2 search version.
Definition: Index.h:43