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faiss::IndexPreTransform Struct Reference

`#include <VectorTransform.h>`

Inheritance diagram for faiss::IndexPreTransform:

## Public Member Functions
| IndexPreTransform (Index *index)
| ! whether pointers are deleted in destructor
| IndexPreTransform (VectorTransform *ltrans, Index *index)
| ltrans is the last transform before the index
void | prepend_transform (VectorTransform *ltrans)
virtual void | set_typename () override
virtual void | train (idx_t n, const float *x) override
virtual void | add (idx_t n, const float *x) override
virtual void | add_with_ids (idx_t n, const float *x, const long *xids) override
virtual void | reset () override
| removes all elements from the database.
virtual long | remove_ids (const IDSelector &sel) override
virtual void | search (idx_t n, const float *x, idx_t k, float *distances, idx_t *labels) const override
void | reconstruct_n (idx_t i0, idx_t ni, float *recons) const override
const float * | apply_chain (idx_t n, const float *x) const
Public Member Functions inherited from faiss::Index
| Index (idx_t d=0, MetricType metric=METRIC_INNER_PRODUCT)
virtual void | range_search (idx_t n, const float *x, float radius, RangeSearchResult *result) const
void | assign (idx_t n, const float *x, idx_t *labels, idx_t k=1)
virtual void | reconstruct (idx_t key, float *recons) const
void | compute_residual (const float *x, float *residual, idx_t key) const
void | display () const
virtual std::string | get_typename () const

## Public Attributes
std::vector< VectorTransform * > | chain
Index * | index
| ! chain of tranforms
bool | own_fields
| ! the sub-index
Public Attributes inherited from faiss::Index
std::string | index_typename
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 applies a LinearTransform transform on vectors before handing them over to a sub-index

Definition at line 238 of file VectorTransform.h.

## Member Function Documentation

void IndexPreTransform::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.

Definition at line 737 of file VectorTransform.cpp.

void IndexPreTransform::add_with_ids | ( | idx_t | n,
|  | const float * | x,
|  | const long * | xids
| ) |  |
| override virtual

Same as add, but stores xids instead of sequential ids.

The default implementation fails with an assertion, as it is not supported by all indexes.

Parameters

  xids | if non-null, ids to store for the vectors (size n)

Reimplemented from faiss::Index.

Definition at line 746 of file VectorTransform.cpp.

const float * IndexPreTransform::apply_chain | ( | idx_t | n,
|  | const float * | x
| ) |  | const

apply the transforms in the chain. The returned float * may be equal to x, otherwise it should be deallocated.

Definition at line 726 of file VectorTransform.cpp.

void IndexPreTransform::reconstruct_n | ( | idx_t | i0,
|  | idx_t | ni,
|  | float * | recons
| ) |  | const
| override virtual

Reconstruct vectors i0 to i0 + ni - 1

this function may not be defined for some indexes

Parameters

  recons | reconstucted vector (size ni * d)

Reimplemented from faiss::Index.

Definition at line 781 of file VectorTransform.cpp.

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

removes IDs from the index. Not supported by all indexes.

Reimplemented from faiss::Index.

Definition at line 774 of file VectorTransform.cpp.

void IndexPreTransform::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.

Definition at line 759 of file VectorTransform.cpp.

void IndexPreTransform::train | ( | idx_t | n,
|  | const float * | x
| ) |  |
| override virtual

Perform training on a representative set of vectors

Parameters

  n | nb of training vectors
  x | training vecors, size n * d

Reimplemented from faiss::Index.

Definition at line 698 of file VectorTransform.cpp.

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

- VectorTransform.h
- VectorTransform.cpp