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GpuAutoTune.cpp
1 /**
2 * Copyright (c) 2015-present, Facebook, Inc.
3 * All rights reserved.
4 *
5 * This source code is licensed under the CC-by-NC license found in the
6 * LICENSE file in the root directory of this source tree.
7 */
8
9 // Copyright 2004-present Facebook. All Rights Reserved.
10 #include "GpuAutoTune.h"
11
12 #include "GpuIndex.h"
13 #include "../FaissAssert.h"
14 #include "../index_io.h"
15 #include "../IndexFlat.h"
16 #include "../IndexIVF.h"
17 #include "../IndexIVFPQ.h"
18 #include "../VectorTransform.h"
19 #include "../MetaIndexes.h"
20 #include "GpuIndexFlat.h"
21 #include "GpuIndexIVFFlat.h"
22 #include "GpuIndexIVFPQ.h"
23 #include "IndexProxy.h"
24
25 namespace faiss { namespace gpu {
26
27 /**********************************************************
28 * Cloning from/to GPU
29 **********************************************************/
30
31
32 struct ToCPUCloner: Cloner {
33
34 void merge_index(Index *dst, Index *src, bool successive_ids) {
35 if (auto ifl = dynamic_cast<IndexFlat *>(dst)) {
36 auto ifl2 = dynamic_cast<const IndexFlat *>(src);
37 FAISS_ASSERT(ifl2);
38 FAISS_ASSERT(successive_ids);
39 ifl->add(ifl2->ntotal, ifl2->xb.data());
40 } else if(auto ifl = dynamic_cast<IndexIVFFlat *>(dst)) {
41 auto ifl2 = dynamic_cast<IndexIVFFlat *>(src);
42 FAISS_ASSERT(ifl2);
43 ifl->merge_from(*ifl2, successive_ids ? ifl->ntotal : 0);
44 } else if(auto ifl = dynamic_cast<IndexIVFPQ *>(dst)) {
45 auto ifl2 = dynamic_cast<IndexIVFPQ *>(src);
46 FAISS_ASSERT(ifl2);
47 ifl->merge_from(*ifl2, successive_ids ? ifl->ntotal : 0);
48 } else {
49 FAISS_ASSERT(!"merging not implemented for this type of class");
50 }
51 }
52
53
54 Index *clone_Index(const Index *index) override {
55 if(auto ifl = dynamic_cast<const GpuIndexFlat *>(index)) {
56 IndexFlat *res = new IndexFlat();
57 ifl->copyTo(res);
58 return res;
59 } else if(auto ifl = dynamic_cast<const GpuIndexIVFFlat *>(index)) {
60 IndexIVFFlat *res = new IndexIVFFlat();
61 ifl->copyTo(res);
62 return res;
63 } else if(auto ipq = dynamic_cast<const GpuIndexIVFPQ *>(index)) {
64 IndexIVFPQ *res = new IndexIVFPQ();
65 ipq->copyTo(res);
66 return res;
67
68 // for IndexShards and IndexProxy we assume that the
69 // objective is to make a single component out of them
70 // (inverse op of ToGpuClonerMultiple)
71
72 } else if(auto ish = dynamic_cast<const IndexShards *>(index)) {
73 int nshard = ish->shard_indexes.size();
74 FAISS_ASSERT(nshard > 0);
75 Index *res = clone_Index(ish->shard_indexes[0]);
76 for(int i = 1; i < ish->shard_indexes.size(); i++) {
77 Index *res_i = clone_Index(ish->shard_indexes[i]);
78 merge_index(res, res_i, ish->successive_ids);
79 delete res_i;
80 }
81 return res;
82 } else if(auto ipr = dynamic_cast<const IndexProxy *>(index)) {
83 // just clone one of the replicas
84 FAISS_ASSERT(ipr->count() > 0);
85 return clone_Index(ipr->at(0));
86 } else {
87 return Cloner::clone_Index(index);
88 }
89 }
90 };
91
92 faiss::Index * index_gpu_to_cpu(const faiss::Index *gpu_index)
93 {
94 ToCPUCloner cl;
95 return cl.clone_Index(gpu_index);
96 }
97
98
99
100 GpuClonerOptions::GpuClonerOptions():
101 indicesOptions(INDICES_64_BIT),
102 useFloat16CoarseQuantizer(false),
103 useFloat16(false),
104 usePrecomputed(true),
105 reserveVecs(0),
106 storeTransposed(false),
107 verbose(0)
108 {}
109
110
111 struct ToGpuCloner: faiss::Cloner, GpuClonerOptions {
112 GpuResources *resources;
113 int device;
114
115 ToGpuCloner(GpuResources *resources, int device,
116 const GpuClonerOptions &options):
117 GpuClonerOptions(options), resources(resources), device(device)
118 {}
119
120 Index *clone_Index(const Index *index) override {
121 if(auto ifl = dynamic_cast<const IndexFlat *>(index)) {
122 GpuIndexFlatConfig config;
123 config.device = device;
124 config.useFloat16 = useFloat16;
125 config.storeTransposed = storeTransposed;
126
127 return new GpuIndexFlat(resources, ifl, config);
128 } else if(auto ifl = dynamic_cast<const faiss::IndexIVFFlat *>(index)) {
129 GpuIndexIVFFlatConfig config;
130 config.device = device;
131 config.indicesOptions = indicesOptions;
132 config.flatConfig.useFloat16 = useFloat16CoarseQuantizer;
133 config.flatConfig.storeTransposed = storeTransposed;
134 config.useFloat16IVFStorage = useFloat16;
135
136 GpuIndexIVFFlat *res =
137 new GpuIndexIVFFlat(resources,
138 ifl->d,
139 ifl->nlist,
140 ifl->metric_type,
141 config);
142 if(reserveVecs > 0 && ifl->ntotal == 0) {
143 res->reserveMemory(reserveVecs);
144 }
145
146 res->copyFrom(ifl);
147 return res;
148 } else if(auto ipq = dynamic_cast<const faiss::IndexIVFPQ *>(index)) {
149 if(verbose)
150 printf(" IndexIVFPQ size %ld -> GpuIndexIVFPQ "
151 "indicesOptions=%d "
152 "usePrecomputed=%d useFloat16=%d reserveVecs=%ld\n",
153 ipq->ntotal, indicesOptions, usePrecomputed,
154 useFloat16, reserveVecs);
155 GpuIndexIVFPQConfig config;
156 config.device = device;
157 config.indicesOptions = indicesOptions;
158 config.flatConfig.useFloat16 = useFloat16CoarseQuantizer;
159 config.flatConfig.storeTransposed = storeTransposed;
160 config.useFloat16LookupTables = useFloat16;
161 config.usePrecomputedTables = usePrecomputed;
162
163 GpuIndexIVFPQ *res = new GpuIndexIVFPQ(resources, ipq, config);
164
165 if(reserveVecs > 0 && ipq->ntotal == 0) {
166 res->reserveMemory(reserveVecs);
167 }
168
169 return res;
170 } else {
171 return Cloner::clone_Index(index);
172 }
173 }
174
175 };
176
177
178 faiss::Index * index_cpu_to_gpu(
179 GpuResources* resources, int device,
180 const faiss::Index *index,
181 const GpuClonerOptions *options)
182 {
183 GpuClonerOptions defaults;
184 ToGpuCloner cl(resources, device, options ? *options : defaults);
185 return cl.clone_Index(index);
186 }
187
188 GpuMultipleClonerOptions::GpuMultipleClonerOptions(): shard(false)
189 {}
190
191 struct ToGpuClonerMultiple: faiss::Cloner, GpuMultipleClonerOptions {
192 std::vector<ToGpuCloner> sub_cloners;
193
194 ToGpuClonerMultiple(std::vector<GpuResources *> & resources,
195 std::vector<int>& devices,
196 const GpuMultipleClonerOptions &options):
197 GpuMultipleClonerOptions(options)
198 {
199 FAISS_ASSERT(resources.size() == devices.size());
200 for(int i = 0; i < resources.size(); i++) {
201 sub_cloners.push_back(ToGpuCloner(
202 resources[i], devices[i], options));
203 }
204 }
205
206
207 ToGpuClonerMultiple(const std::vector<ToGpuCloner> & sub_cloners,
208 const GpuMultipleClonerOptions &options):
209 GpuMultipleClonerOptions(options),
210 sub_cloners(sub_cloners)
211 {}
212
213
214 Index *clone_Index(const Index *index) override {
215 long n = sub_cloners.size();
216
217 if (n == 1)
218 return sub_cloners[0].clone_Index(index);
219
220 if(dynamic_cast<const IndexFlat *>(index) ||
221 dynamic_cast<const faiss::IndexIVFFlat *>(index) ||
222 dynamic_cast<const faiss::IndexIVFPQ *>(index)) {
223 if(!shard) {
224 IndexProxy * res = new IndexProxy();
225 for(auto & sub_cloner: sub_cloners) {
226 res->addIndex(sub_cloner.clone_Index(index));
227 }
228 res->own_fields = true;
229 return res;
230 } else {
231 auto index_ivfpq =
232 dynamic_cast<const faiss::IndexIVFPQ *>(index);
233 auto index_ivfflat =
234 dynamic_cast<const faiss::IndexIVFFlat *>(index);
235 FAISS_ASSERT_MSG (index_ivfpq || index_ivfflat,
236 "IndexShards implemented only for "
237 "IndexIVFFlat or IndexIVFPQ");
238 std::vector<faiss::Index*> shards(n);
239
240 for(long i = 0; i < n; i++) {
241 // make a shallow copy
242 long i0 = i * index->ntotal / n;
243 long i1 = (i + 1) * index->ntotal / n;
244 if(verbose)
245 printf("IndexShards shard %ld indices %ld:%ld\n",
246 i, i0, i1);
247
248 if(reserveVecs)
249 sub_cloners[i].reserveVecs =
250 (reserveVecs + n - 1) / n;
251
252 if (index_ivfpq) {
253 faiss::IndexIVFPQ idx2(
254 index_ivfpq->quantizer, index_ivfpq->d,
255 index_ivfpq->nlist, index_ivfpq->code_size,
256 index_ivfpq->pq.nbits);
257 idx2.metric_type = index_ivfpq->metric_type;
258 idx2.pq = index_ivfpq->pq;
259 idx2.nprobe = index_ivfpq->nprobe;
260 idx2.use_precomputed_table = 0;
261 idx2.is_trained = index->is_trained;
262 index_ivfpq->copy_subset_to(idx2, 0, i0, i1);
263 shards[i] = sub_cloners[i].clone_Index(&idx2);
264 } else if (index_ivfflat) {
265 faiss::IndexIVFFlat idx2(
266 index_ivfflat->quantizer, index->d,
267 index_ivfflat->nlist, index_ivfflat->metric_type);
268 idx2.nprobe = index_ivfflat->nprobe;
269 index_ivfflat->copy_subset_to(idx2, 0, i0, i1);
270 idx2.nprobe = index_ivfflat->nprobe;
271 shards[i] = sub_cloners[i].clone_Index(&idx2);
272 }
273 }
274 faiss::IndexShards *res =
275 new faiss::IndexShards(index->d, true, false);
276
277 for (int i = 0; i < n; i++) {
278 res->add_shard(shards[i]);
279 }
280 res->own_fields = true;
281 FAISS_ASSERT(index->ntotal == res->ntotal);
282 return res;
283 }
284 } else if(auto miq = dynamic_cast<const MultiIndexQuantizer *>(index)) {
285 if (verbose) {
286 printf("cloning MultiIndexQuantizer: "
287 "will be valid only for search k=1\n");
288 }
289 const ProductQuantizer & pq = miq->pq;
290 IndexSplitVectors *splitv = new IndexSplitVectors(pq.d, true);
291 splitv->own_fields = true;
292
293 for (int m = 0; m < pq.M; m++) {
294 // which GPU(s) will be assigned to this sub-quantizer
295
296 long i0 = m * n / pq.M;
297 long i1 = pq.M <= n ? (m + 1) * n / pq.M : i0 + 1;
298 std::vector<ToGpuCloner> sub_cloners_2;
299 sub_cloners_2.insert(
300 sub_cloners_2.begin(), sub_cloners.begin() + i0,
301 sub_cloners.begin() + i1);
302 ToGpuClonerMultiple cm(sub_cloners_2, *this);
303 IndexFlatL2 idxc (pq.dsub);
304 idxc.add (pq.ksub, pq.centroids.data() + m * pq.d * pq.ksub);
305 Index *idx2 = cm.clone_Index(&idxc);
306 splitv->add_sub_index(idx2);
307 }
308 return splitv;
309 } else {
310 return Cloner::clone_Index(index);
311 }
312 }
313
314
315 };
316
317
318
319 faiss::Index * index_cpu_to_gpu_multiple(
320 std::vector<GpuResources*> & resources,
321 std::vector<int> &devices,
322 const faiss::Index *index,
323 const GpuMultipleClonerOptions *options)
324 {
325 GpuMultipleClonerOptions defaults;
326 ToGpuClonerMultiple cl(resources, devices, options ? *options : defaults);
327 return cl.clone_Index(index);
328 }
329
330
331
332 /**********************************************************
333 * Parameters to auto-tune on GpuIndex'es
334 **********************************************************/
335
336 #define DC(classname) auto ix = dynamic_cast<const classname *>(index)
337
338
339 void GpuParameterSpace::initialize (const Index * index)
340 {
341 if (DC (IndexPreTransform)) {
342 index = ix->index;
343 }
344 if (DC (IndexProxy)) {
345 if (ix->count() == 0) return;
346 index = ix->at(0);
347 }
348 if (DC (faiss::IndexShards)) {
349 if (ix->shard_indexes.size() == 0) return;
350 index = ix->shard_indexes[0];
351 }
352 if (DC (GpuIndexIVF)) {
353 ParameterRange & pr = add_range("nprobe");
354 for (int i = 0; i < 12; i++) {
355 size_t nprobe = 1 << i;
356 if (nprobe >= ix->getNumLists() ||
357 nprobe > 1024) break;
358 pr.values.push_back (nprobe);
359 }
360 }
361 // not sure we should call the parent initializer
362 }
363
364
365
366 #undef DC
367 // non-const version
368 #define DC(classname) auto *ix = dynamic_cast<classname *>(index)
369
370
371
372 void GpuParameterSpace::set_index_parameter (
373 Index * index, const std::string & name, double val) const
374 {
375 if (DC (IndexPreTransform)) {
376 index = ix->index;
377 }
378 if (DC (IndexProxy)) {
379 for (int i = 0; i < ix->count(); i++)
380 set_index_parameter (ix->at(i), name, val);
381 return;
382 }
383 if (DC (faiss::IndexShards)) {
384 for (auto sub_index : ix->shard_indexes)
385 set_index_parameter (sub_index, name, val);
386 return;
387 }
388 if (name == "nprobe") {
389 DC (GpuIndexIVF);
390 FAISS_ASSERT(ix);
391 ix->setNumProbes (int (val));
392 return;
393 }
394 if (name == "use_precomputed_table") {
395 DC (GpuIndexIVFPQ);
396 FAISS_ASSERT(ix);
397 ix->setPrecomputedCodes(bool (val));
398 return;
399 }
400
401 FAISS_ASSERT_MSG (false, "unknown parameter");
402 }
403
404
405
406
407 } } // namespace
faiss::Cloner
Definition: index_io.h:51
faiss::IndexFlat
Definition: IndexFlat.h:23
faiss::gpu::GpuIndexIVFPQConfig::usePrecomputedTables
bool usePrecomputedTables
Definition: GpuIndexIVFPQ.h:36
faiss::gpu::GpuMultipleClonerOptions::shard
bool shard
Definition: GpuClonerOptions.h:49
faiss::gpu::GpuIndexFlatConfig::storeTransposed
bool storeTransposed
Definition: GpuIndexFlat.h:48
faiss::gpu::GpuClonerOptions::storeTransposed
bool storeTransposed
For GpuIndexFlat, store data in transposed layout?
Definition: GpuClonerOptions.h:38
faiss::IndexIVF::nprobe
size_t nprobe
number of probes at query time
Definition: IndexIVF.h:47
faiss::gpu::GpuParameterSpace::initialize
void initialize(const faiss::Index *index) override
initialize with reasonable parameters for the index
Definition: GpuAutoTune.cpp:339
faiss::gpu::GpuClonerOptions
set some options on how to copy to GPU
Definition: GpuClonerOptions.h:17
faiss::IndexFlatL2
Definition: IndexFlat.h:79
faiss::gpu::GpuIndexIVFFlat::copyFrom
void copyFrom(const faiss::IndexIVFFlat *index)
Definition: GpuIndexIVFFlat.cu:79
faiss::ProductQuantizer::dsub
size_t dsub
dimensionality of each subvector
Definition: ProductQuantizer.h:32
faiss::gpu::GpuClonerOptions::usePrecomputed
bool usePrecomputed
use precomputed tables?
Definition: GpuClonerOptions.h:32
faiss::gpu::GpuIndexIVFFlatConfig::useFloat16IVFStorage
bool useFloat16IVFStorage
Definition: GpuIndexIVFFlat.h:29
faiss::IndexPreTransform
Definition: VectorTransform.h:230
faiss::gpu::GpuResources
Definition: GpuResources.h:23
faiss::IndexIVFFlat
Definition: IndexIVF.h:129
faiss::gpu::GpuMultipleClonerOptions
Definition: GpuClonerOptions.h:44
faiss::gpu::GpuIndexIVFPQConfig::useFloat16LookupTables
bool useFloat16LookupTables
Definition: GpuIndexIVFPQ.h:32
faiss::ParameterSpace::add_range
ParameterRange & add_range(const char *name)
add a new parameter
Definition: AutoTune.cpp:322
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::IndexSplitVectors
Definition: MetaIndexes.h:108
faiss::gpu::GpuIndexIVF
Definition: GpuIndexIVF.h:37
faiss::gpu::IndexProxy
Definition: IndexProxy.h:24
faiss::Index::d
int d
vector dimension
Definition: Index.h:64
faiss::gpu::GpuIndexFlatConfig
Definition: GpuIndexFlat.h:27
faiss::gpu::GpuIndexIVFConfig::flatConfig
GpuIndexFlatConfig flatConfig
Configuration for the coarse quantizer object.
Definition: GpuIndexIVF.h:34
faiss::gpu::GpuParameterSpace::set_index_parameter
void set_index_parameter(faiss::Index *index, const std::string &name, double val) const override
set a combination of parameters on an index
Definition: GpuAutoTune.cpp:372
faiss::gpu::GpuIndexIVFPQConfig
Definition: GpuIndexIVFPQ.h:23
faiss::IndexIVFPQ
Definition: IndexIVFPQ.h:29
faiss::gpu::GpuIndexIVFPQ::reserveMemory
void reserveMemory(size_t numVecs)
Reserve GPU memory in our inverted lists for this number of vectors.
Definition: GpuIndexIVFPQ.cu:195
faiss::gpu::GpuIndexIVFFlat::reserveMemory
void reserveMemory(size_t numVecs)
Reserve GPU memory in our inverted lists for this number of vectors.
Definition: GpuIndexIVFFlat.cu:71
faiss::gpu::GpuClonerOptions::useFloat16
bool useFloat16
Definition: GpuClonerOptions.h:29
faiss::gpu::GpuClonerOptions::indicesOptions
IndicesOptions indicesOptions
Definition: GpuClonerOptions.h:22
faiss::ProductQuantizer::ksub
size_t ksub
number of centroids for each subquantizer
Definition: ProductQuantizer.h:35
faiss::gpu::GpuClonerOptions::useFloat16CoarseQuantizer
bool useFloat16CoarseQuantizer
is the coarse quantizer in float16?
Definition: GpuClonerOptions.h:25
faiss::Index::ntotal
idx_t ntotal
total nb of indexed vectors
Definition: Index.h:65
faiss::IndexFlat::add
void add(idx_t n, const float *x) override
Definition: IndexFlat.cpp:30
faiss::gpu::IndexProxy::addIndex
void addIndex(faiss::Index *index)
Definition: IndexProxy.cpp:32
faiss::gpu::ToGpuClonerMultiple
Definition: GpuAutoTune.cpp:191
faiss::gpu::GpuIndexIVFPQ
IVFPQ index for the GPU.
Definition: GpuIndexIVFPQ.h:40
faiss::Index::metric_type
MetricType metric_type
type of metric this index uses for search
Definition: Index.h:72
faiss::IndexIVFPQ::pq
ProductQuantizer pq
produces the codes
Definition: IndexIVFPQ.h:33
faiss::ProductQuantizer::M
size_t M
number of subquantizers
Definition: ProductQuantizer.h:28
faiss::Index
Definition: Index.h:60
faiss::gpu::GpuIndexFlat
Definition: GpuIndexFlat.h:54
faiss::IndexShards
Definition: MetaIndexes.h:60
faiss::gpu::ToGpuCloner
Definition: GpuAutoTune.cpp:111
faiss::ProductQuantizer
Definition: ProductQuantizer.h:25
faiss::Index::is_trained
bool is_trained
set if the Index does not require training, or if training is done already
Definition: Index.h:69
faiss::gpu::GpuIndexIVFFlatConfig
Definition: GpuIndexIVFFlat.h:22
faiss::ParameterRange
possible values of a parameter, sorted from least to most expensive/accurate
Definition: AutoTune.h:125
faiss::ProductQuantizer::d
size_t d
size of the input vectors
Definition: ProductQuantizer.h:27
faiss::gpu::ToCPUCloner
Definition: GpuAutoTune.cpp:32
faiss::gpu::GpuIndexIVFConfig::indicesOptions
IndicesOptions indicesOptions
Index storage options for the GPU.
Definition: GpuIndexIVF.h:31
faiss::gpu::GpuClonerOptions::verbose
bool verbose
Set verbose options on the index.
Definition: GpuClonerOptions.h:41
faiss::gpu::GpuIndexIVFFlat
Definition: GpuIndexIVFFlat.h:34
faiss::gpu::GpuClonerOptions::reserveVecs
long reserveVecs
reserve vectors in the invfiles?
Definition: GpuClonerOptions.h:35
faiss::IndexIVFPQ::use_precomputed_table
int use_precomputed_table
if by_residual, build precompute tables
Definition: IndexIVFPQ.h:31
faiss::ProductQuantizer::centroids
std::vector< float > centroids
Centroid table, size M * ksub * dsub.
Definition: ProductQuantizer.h:52