File index_io.h
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namespace faiss
Implementation of k-means clustering with many variants.
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)
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.
This file contains callbacks for kernels that compute distances.
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.
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.
Definition of inverted lists + a few common classes that implement the interface.
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.
In this file are the implementations of extra metrics beyond L2 and inner product
Implements a few neural net layers, mainly to support QINCo
Defines a few objects that apply transformations to a set of vectors Often these are pre-processing steps.
Functions
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void write_index_binary(const IndexBinary *idx, const char *fname)
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void write_index_binary(const IndexBinary *idx, FILE *f)
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void write_index_binary(const IndexBinary *idx, IOWriter *writer)
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IndexBinary *read_index_binary(const char *fname, int io_flags = 0)
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IndexBinary *read_index_binary(FILE *f, int io_flags = 0)
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IndexBinary *read_index_binary(IOReader *reader, int io_flags = 0)
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void write_VectorTransform(const VectorTransform *vt, const char *fname)
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void write_VectorTransform(const VectorTransform *vt, IOWriter *f)
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VectorTransform *read_VectorTransform(const char *fname)
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VectorTransform *read_VectorTransform(IOReader *f)
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ProductQuantizer *read_ProductQuantizer(const char *fname)
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ProductQuantizer *read_ProductQuantizer(IOReader *reader)
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void write_ProductQuantizer(const ProductQuantizer *pq, const char *fname)
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void write_ProductQuantizer(const ProductQuantizer *pq, IOWriter *f)
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void write_InvertedLists(const InvertedLists *ils, IOWriter *f)
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InvertedLists *read_InvertedLists(IOReader *reader, int io_flags = 0)
Variables
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const int IO_FLAG_SKIP_STORAGE = 1
skip the storage for graph-based indexes
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const int IO_FLAG_READ_ONLY = 2
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const int IO_FLAG_ONDISK_SAME_DIR = 4
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const int IO_FLAG_SKIP_IVF_DATA = 8
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const int IO_FLAG_SKIP_PRECOMPUTE_TABLE = 16
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const int IO_FLAG_PQ_SKIP_SDC_TABLE = 32
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const int IO_FLAG_MMAP = IO_FLAG_SKIP_IVF_DATA | 0x646f0000
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void write_index_binary(const IndexBinary *idx, const char *fname)