All Classes Namespaces Functions Variables Typedefs Enumerations Enumerator Friends
faiss::IndexBinaryFlat Struct Reference

`#include <IndexBinaryFlat.h>`

Inheritance diagram for faiss::IndexBinaryFlat:

## Public Member Functions

| IndexBinaryFlat (idx_t d)
void | add (idx_t n, const uint8_t *x) override
void | reset () override
| Removes all elements from the database.
void | search (idx_t n, const uint8_t *x, idx_t k, int32_t *distances, idx_t *labels) const override
void | reconstruct (idx_t key, uint8_t *recons) const override
long | remove_ids (const IDSelector &sel) override
Public Member Functions inherited from faiss::IndexBinary
| IndexBinary (idx_t d=0, MetricType metric=METRIC_L2)
virtual void | train (idx_t n, const uint8_t *x)
virtual void | add_with_ids (idx_t n, const uint8_t *x, const long *xids)
virtual void | range_search (idx_t n, const uint8_t *x, int radius, RangeSearchResult *result) const
void | assign (idx_t n, const uint8_t *x, idx_t *labels, idx_t k=1)
virtual void | reconstruct_n (idx_t i0, idx_t ni, uint8_t *recons) const
virtual void | search_and_reconstruct (idx_t n, const uint8_t *x, idx_t k, int32_t *distances, idx_t *labels, uint8_t *recons) const
void | display () const

## Public Attributes

std::vector< uint8_t > | xb
| database vectors, size ntotal * d / 8
bool | use_heap = true
size_t | query_batch_size = 32
Public Attributes inherited from faiss::IndexBinary
int | d
| vector dimension
int | code_size
| number of bytes per vector ( = d / 8 )
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::IndexBinary
using | idx_t = Index::idx_t
| all indices are this type
using | component_t = uint8_t
using | distance_t = int32_t

## Detailed Description

Index that stores the full vectors and performs exhaustive search.

Definition at line 21 of file IndexBinaryFlat.h.

## Member Function Documentation

void faiss::IndexBinaryFlat::add | ( | idx_t | n,
|  | const uint8_t * | x
| ) |  |

overridevirtual

Add n vectors of dimension d to the index.

Vectors are implicitly assigned labels ntotal .. ntotal + n - 1

Parameters

  x | input matrix, size n * d / 8

Implements faiss::IndexBinary.

Definition at line 24 of file IndexBinaryFlat.cpp.

void faiss::IndexBinaryFlat::reconstruct | ( | idx_t | key,
|  | uint8_t * | recons
| ) |  | const

overridevirtual

Reconstruct a stored vector.

This function may not be defined for some indexes.

Parameters

  key | id of the vector to reconstruct
  recons | reconstucted vector (size d / 8)

Reimplemented from faiss::IndexBinary.

Definition at line 78 of file IndexBinaryFlat.cpp.

long faiss::IndexBinaryFlat::remove_ids | ( | const IDSelector & | sel | ) |

overridevirtual

Remove some ids. Note that because of the indexing structure, the semantics of this operation are different from the usual ones: the new ids are shifted.

Reimplemented from faiss::IndexBinary.

Definition at line 58 of file IndexBinaryFlat.cpp.

void faiss::IndexBinaryFlat::search | ( | idx_t | n,
|  | const uint8_t * | x,
|  | idx_t | k,
|  | int32_t * | distances,
|  | idx_t * | labels
| ) |  | const

overridevirtual

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 / 8
  labels | output labels of the NNs, size n*k
  distances | output pairwise distances, size n*k

Implements faiss::IndexBinary.

Definition at line 34 of file IndexBinaryFlat.cpp.

## Member Data Documentation

bool faiss::IndexBinaryFlat::use_heap = true

Select between using a heap or counting to select the k smallest values when scanning inverted lists.

Definition at line 28 of file IndexBinaryFlat.h.

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

- /data/users/hoss/faiss/IndexBinaryFlat.h
- /data/users/hoss/faiss/IndexBinaryFlat.cpp