File GpuIndexIVFFlat.h
-
namespace faiss
Copyright (c) Facebook, Inc. and its affiliates.
This source code is licensed under the MIT license found in the LICENSE file in the root directory of this source tree.
Copyright (c) Facebook, Inc. and its affiliates.
This source code is licensed under the MIT license found in the LICENSE file in the root directory of this source tree. IDSelector is intended to define a subset of vectors to handle (for removal or as subset to search)
Copyright (c) Facebook, Inc. and its affiliates.
This source code is licensed under the MIT license found in the LICENSE file in the root directory of this source tree. PQ4 SIMD packing and accumulation functions
The basic kernel accumulates nq query vectors with bbs = nb * 2 * 16 vectors and produces an output matrix for that. It is interesting for nq * nb <= 4, otherwise register spilling becomes too large.
The implementation of these functions is spread over 3 cpp files to reduce parallel compile times. Templates are instantiated explicitly.
Copyright (c) Facebook, Inc. and its affiliates.
This source code is licensed under the MIT license found in the LICENSE file in the root directory of this source tree. This file contains callbacks for kernels that compute distances.
The SIMDResultHandler object is intended to be templated and inlined. Methods:
handle(): called when 32 distances are computed and provided in two simd16uint16. (q, b) indicate which entry it is in the block.
set_block_origin(): set the sub-matrix that is being computed
Throughout the library, vectors are provided as float * pointers. Most algorithms can be optimized when several vectors are processed (added/searched) together in a batch. In this case, they are passed in as a matrix. When n vectors of size d are provided as float * x, component j of vector i is
x[ i * d + j ]
where 0 <= i < n and 0 <= j < d. In other words, matrices are always compact. When specifying the size of the matrix, we call it an n*d matrix, which implies a row-major storage.
Copyright (c) Facebook, Inc. and its affiliates.
This source code is licensed under the MIT license found in the LICENSE file in the root directory of this source tree. I/O functions can read/write to a filename, a file handle or to an object that abstracts the medium.
The read functions return objects that should be deallocated with delete. All references within these objectes are owned by the object.
Copyright (c) Facebook, Inc. and its affiliates.
This source code is licensed under the MIT license found in the LICENSE file in the root directory of this source tree. Definition of inverted lists + a few common classes that implement the interface.
Copyright (c) Facebook, Inc. and its affiliates.
This source code is licensed under the MIT license found in the LICENSE file in the root directory of this source tree. Since IVF (inverted file) indexes are of so much use for large-scale use cases, we group a few functions related to them in this small library. Most functions work both on IndexIVFs and IndexIVFs embedded within an IndexPreTransform.
Copyright (c) Facebook, Inc. and its affiliates.
This source code is licensed under the MIT license found in the LICENSE file in the root directory of this source tree. In this file are the implementations of extra metrics beyond L2 and inner product
Copyright (c) Facebook, Inc. and its affiliates.
This source code is licensed under the MIT license found in the LICENSE file in the root directory of this source tree. Defines a few objects that apply transformations to a set of vectors Often these are pre-processing steps.
-
namespace gpu
-
struct GpuIndexIVFFlatConfig : public faiss::gpu::GpuIndexIVFConfig
Public Members
-
bool interleavedLayout = true
Use the alternative memory layout for the IVF lists (currently the default)
-
bool interleavedLayout = true
-
class GpuIndexIVFFlat : public faiss::gpu::GpuIndexIVF
- #include <GpuIndexIVFFlat.h>
Wrapper around the GPU implementation that looks like faiss::IndexIVFFlat
Public Functions
-
GpuIndexIVFFlat(GpuResourcesProvider *provider, const faiss::IndexIVFFlat *index, GpuIndexIVFFlatConfig config = GpuIndexIVFFlatConfig())
Construct from a pre-existing faiss::IndexIVFFlat instance, copying data over to the given GPU, if the input index is trained.
-
GpuIndexIVFFlat(GpuResourcesProvider *provider, int dims, idx_t nlist, faiss::MetricType metric = faiss::METRIC_L2, GpuIndexIVFFlatConfig config = GpuIndexIVFFlatConfig())
Constructs a new instance with an empty flat quantizer; the user provides the number of IVF lists desired.
-
GpuIndexIVFFlat(GpuResourcesProvider *provider, Index *coarseQuantizer, int dims, idx_t nlist, faiss::MetricType metric = faiss::METRIC_L2, GpuIndexIVFFlatConfig config = GpuIndexIVFFlatConfig())
Constructs a new instance with a provided CPU or GPU coarse quantizer; the user provides the number of IVF lists desired.
-
~GpuIndexIVFFlat() override
-
void reserveMemory(size_t numVecs)
Reserve GPU memory in our inverted lists for this number of vectors.
-
void copyFrom(const faiss::IndexIVFFlat *index)
Initialize ourselves from the given CPU index; will overwrite all data in ourselves
-
void copyTo(faiss::IndexIVFFlat *index) const
Copy ourselves to the given CPU index; will overwrite all data in the index instance
-
size_t reclaimMemory()
After adding vectors, one can call this to reclaim device memory to exactly the amount needed. Returns space reclaimed in bytes
-
virtual void reset() override
Clears out all inverted lists, but retains the coarse centroid information
-
virtual void updateQuantizer() override
Should be called if the user ever changes the state of the IVF coarse quantizer manually (e.g., substitutes a new instance or changes vectors in the coarse quantizer outside the scope of training)
-
virtual void train(idx_t n, const float *x) override
Trains the coarse quantizer based on the given vector data.
Protected Attributes
-
const GpuIndexIVFFlatConfig ivfFlatConfig_
Our configuration options.
-
size_t reserveMemoryVecs_
Desired inverted list memory reservation.
-
std::shared_ptr<IVFFlat> index_
Instance that we own; contains the inverted lists.
-
GpuIndexIVFFlat(GpuResourcesProvider *provider, const faiss::IndexIVFFlat *index, GpuIndexIVFFlatConfig config = GpuIndexIVFFlatConfig())
-
struct GpuIndexIVFFlatConfig : public faiss::gpu::GpuIndexIVFConfig