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faiss::IndexFlat Struct Reference

`#include <IndexFlat.h>`

Inheritance diagram for faiss::IndexFlat:

## Public Member Functions
| IndexFlat (idx_t d, MetricType metric=METRIC_INNER_PRODUCT)
void | add (idx_t n, const float *x) override
void | reset () override
| removes all elements from the database.
void | search (idx_t n, const float *x, idx_t k, float *distances, idx_t *labels) const override
void | range_search (idx_t n, const float *x, float radius, RangeSearchResult *result) const override
void | reconstruct (idx_t key, float *recons) const override
void | compute_distance_subset (idx_t n, const float *x, idx_t k, float *distances, const idx_t *labels) const
long | remove_ids (const IDSelector &sel) override
Public Member Functions inherited from faiss::Index
| Index (idx_t d=0, MetricType metric=METRIC_INNER_PRODUCT)
virtual void | train (idx_t, const float *)
virtual void | add_with_ids (idx_t n, const float *x, const long *xids)
void | assign (idx_t n, const float *x, idx_t *labels, idx_t k=1)
virtual void | reconstruct_n (idx_t i0, idx_t ni, float *recons) const
void | compute_residual (const float *x, float *residual, idx_t key) const
void | display () const

## Public Attributes
std::vector< float > | xb
| database vectors, size ntotal * d
Public Attributes inherited from faiss::Index
int | d
| vector dimension
idx_t | ntotal
| total nb of indexed vectors
bool | verbose
| verbosity level
bool | is_trained
| set if the Index does not require training, or if training is done already
MetricType | metric_type
| type of metric this index uses for search

## Additional Inherited Members
Public Types inherited from faiss::Index
typedef long | idx_t
| all indices are this type

## Detailed Description

Index that stores the full vectors and performs exhaustive search

Definition at line 23 of file IndexFlat.h.

## Member Function Documentation

void faiss::IndexFlat::add | ( | idx_t | n,
|  | const float * | x
| ) |  |
| override virtual

Add n vectors of dimension d to the index.

Vectors are implicitly assigned labels ntotal .. ntotal + n - 1 This function slices the input vectors in chuncks smaller than blocksize_add and calls add_core.

Parameters

  x | input matrix, size n * d

Implements faiss::Index.

Reimplemented in faiss::IndexFlat1D.

Definition at line 30 of file IndexFlat.cpp.

void faiss::IndexFlat::compute_distance_subset | ( | idx_t | n,
|  | const float * | x,
|  | idx_t | k,
|  | float * | distances,
|  | const idx_t * | labels
| ) |  | const

compute distance with a subset of vectors

Parameters

  x | query vectors, size n * d
  labels | indices of the vectors that should be compared for each query vector, size n * k
  distances | corresponding output distances, size n * k

Definition at line 73 of file IndexFlat.cpp.

void faiss::IndexFlat::range_search | ( | idx_t | n,
|  | const float * | x,
|  | float | radius,
|  | RangeSearchResult * | result
| ) |  | const
| override virtual

query n vectors of dimension d to the index.

return all vectors with distance < radius. Note that many indexes do not implement the range_search (only the k-NN search is mandatory).

Parameters

  x | input vectors to search, size n * d
  radius | search radius
  result | result table

Reimplemented from faiss::Index.

Definition at line 58 of file IndexFlat.cpp.

void faiss::IndexFlat::reconstruct | ( | idx_t | key,
|  | float * | recons
| ) |  | const
| override virtual

Reconstruct a stored vector (or an approximation if lossy coding)

this function may not be defined for some indexes

Parameters

  key | id of the vector to reconstruct
  recons | reconstucted vector (size d)

Reimplemented from faiss::Index.

Definition at line 118 of file IndexFlat.cpp.

long faiss::IndexFlat::remove_ids | ( | const IDSelector & | sel | ) |
| override virtual

remove some ids. NB that Because of the structure of the indexing structre, the semantics of this operation are different from the usual ones: the new ids are shifted

Reimplemented from faiss::Index.

Definition at line 95 of file IndexFlat.cpp.

void faiss::IndexFlat::search | ( | idx_t | n,
|  | const float * | x,
|  | idx_t | k,
|  | float * | distances,
|  | idx_t * | labels
| ) |  | const
| override virtual

query n vectors of dimension d to the index.

return at most k vectors. If there are not enough results for a query, the result array is padded with -1s.

Parameters

  x | input vectors to search, size n * d
  labels | output labels of the NNs, size n*k
  distances | output pairwise distances, size n*k

Implements faiss::Index.

Reimplemented in faiss::IndexFlat1D, and faiss::IndexFlatL2BaseShift.

Definition at line 42 of file IndexFlat.cpp.

The documentation for this struct was generated from the following files:

- /data/users/matthijs/github_faiss/faiss/IndexFlat.h
- /data/users/matthijs/github_faiss/faiss/IndexFlat.cpp