File MetricType.h¶
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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.
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.
Typedefs
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using idx_t = int64_t¶
all vector indices are this type
Enums
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enum MetricType¶
The metric space for vector comparison for Faiss indices and algorithms.
Most algorithms support both inner product and L2, with the flat (brute-force) indices supporting additional metric types for vector comparison.
Values:
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enumerator METRIC_INNER_PRODUCT¶
maximum inner product search
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enumerator METRIC_L2¶
squared L2 search
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enumerator METRIC_L1¶
L1 (aka cityblock)
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enumerator METRIC_Linf¶
infinity distance
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enumerator METRIC_Lp¶
L_p distance, p is given by a faiss::Index metric_arg
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enumerator METRIC_Canberra¶
some additional metrics defined in scipy.spatial.distance
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enumerator METRIC_BrayCurtis¶
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enumerator METRIC_JensenShannon¶
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enumerator METRIC_INNER_PRODUCT¶
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using idx_t = int64_t¶