pairwise

Documentation

Overview

Package pairwise implements utilities to evaluate pairwise distances or inner product (via kernel).

Index

• type Chebyshev
  • func NewChebyshev() *Chebyshev
  • func (self *Chebyshev) Distance(vectorX *mat64.Dense, vectorY *mat64.Dense) float64
• type Cranberra
  • func NewCranberra() *Cranberra
  • func (self *Cranberra) Distance(vectorX *mat64.Dense, vectorY *mat64.Dense) float64
• type Euclidean
  • func NewEuclidean() *Euclidean
  • func (self *Euclidean) Distance(vectorX *mat64.Dense, vectorY *mat64.Dense) float64
  • func (self *Euclidean) InnerProduct(vectorX *mat64.Dense, vectorY *mat64.Dense) float64
• type Manhattan
  • func NewManhattan() *Manhattan
  • func (self *Manhattan) Distance(vectorX *mat64.Dense, vectorY *mat64.Dense) float64
• type PolyKernel
  • func NewPolyKernel(degree int) *PolyKernel
  • func (self *PolyKernel) Distance(vectorX *mat64.Dense, vectorY *mat64.Dense) float64
  • func (self *PolyKernel) InnerProduct(vectorX *mat64.Dense, vectorY *mat64.Dense) float64
• type RBFKernel
  • func NewRBFKernel(gamma float64) *RBFKernel
  • func (self *RBFKernel) InnerProduct(vectorX *mat64.Dense, vectorY *mat64.Dense) float64

Types

type Chebyshev

type Chebyshev struct{}

func NewChebyshev

func NewChebyshev() *Chebyshev

func (*Chebyshev) Distance

func (self *Chebyshev) Distance(vectorX *mat64.Dense, vectorY *mat64.Dense) float64

type Cranberra

type Cranberra struct{}

func NewCranberra

func NewCranberra() *Cranberra

func (*Cranberra) Distance

func (self *Cranberra) Distance(vectorX *mat64.Dense, vectorY *mat64.Dense) float64

type Euclidean

type Euclidean struct{}

func NewEuclidean

func NewEuclidean() *Euclidean

func (*Euclidean) Distance

func (self *Euclidean) Distance(vectorX *mat64.Dense, vectorY *mat64.Dense) float64

Compute Euclidean distance (also known as L2 distance).

func (*Euclidean) InnerProduct

func (self *Euclidean) InnerProduct(vectorX *mat64.Dense, vectorY *mat64.Dense) float64

Compute Eucledian inner product.

type Manhattan

type Manhattan struct{}

func NewManhattan

func NewManhattan() *Manhattan

func (*Manhattan) Distance

func (self *Manhattan) Distance(vectorX *mat64.Dense, vectorY *mat64.Dense) float64

Manhattan distance, also known as L1 distance. Compute sum of absolute values of elements.

type PolyKernel

type PolyKernel struct {
	// contains filtered or unexported fields
}

func NewPolyKernel

func NewPolyKernel(degree int) *PolyKernel

Return a d-degree polynomial kernel

func (*PolyKernel) Distance

func (self *PolyKernel) Distance(vectorX *mat64.Dense, vectorY *mat64.Dense) float64

Compute distance under the polynomial kernel, maybe no need.

func (*PolyKernel) InnerProduct

func (self *PolyKernel) InnerProduct(vectorX *mat64.Dense, vectorY *mat64.Dense) float64

Compute inner product through kernel trick K(x, y) = (x^T y + 1)^d

type RBFKernel

type RBFKernel struct {
	// contains filtered or unexported fields
}

func NewRBFKernel

func NewRBFKernel(gamma float64) *RBFKernel

Radial Basis Function Kernel

func (*RBFKernel) InnerProduct

func (self *RBFKernel) InnerProduct(vectorX *mat64.Dense, vectorY *mat64.Dense) float64

Compute inner product through kernel trick K(x, y) = exp(-gamma * ||x - y||^2)