Public Types
enum	QuantizerType { QT_8bit, QT_4bit, QT_8bit_uniform, QT_4bit_uniform, QT_fp16, QT_8bit_direct, QT_6bit }

enum	RangeStat { RS_minmax, RS_meanstd, RS_quantiles, RS_optim }

Public Member Functions
	ScalarQuantizer (size_t d, QuantizerType qtype)

void	train (size_t n, const float *x)

void	compute_codes (const float x, uint8_t codes, size_t n) const
	same as compute_code for several vectors

void	decode (const uint8_t code, float x, size_t n) const
	decode a vector from a given code (or n vectors if third argument)

SQDistanceComputer *	get_distance_computer (MetricType metric=METRIC_L2) const

Public Attributes
QuantizerType	qtype

RangeStat	rangestat

float	rangestat_arg

size_t	d
	dimension of input vectors

size_t	code_size
	bytes per vector

std::vector< float >	trained
	trained values (including the range)

Detailed Description

Definition at line 32 of file IndexScalarQuantizer.h.

Member Enumeration Documentation

Enumerator
QT_8bit	8 bits per component
QT_4bit	4 bits per component
QT_8bit_uniform	same, shared range for all dimensions
QT_6bit	fast indexing of uint8s 6 bits per component

Definition at line 34 of file IndexScalarQuantizer.h.

The uniform encoder can estimate the range of representable values of the unform encoder using different statistics. Here rs = rangestat_arg

Enumerator
RS_minmax	[min - rs(max-min), max + rs(max-min)]
RS_meanstd	[mean - std * rs, mean + std * rs]
RS_quantiles	[Q(rs), Q(1-rs)]
RS_optim	alternate optimization of reconstruction error

Definition at line 51 of file IndexScalarQuantizer.h.

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