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28 lines
615 B
Go
28 lines
615 B
Go
package pairwise
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import (
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"math"
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"github.com/gonum/matrix/mat64"
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)
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type RBFKernel struct {
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gamma float64
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}
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// NewRBFKernel returns a representation of a Radial Basis Function Kernel
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func NewRBFKernel(gamma float64) *RBFKernel {
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return &RBFKernel{gamma: gamma}
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}
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// InnerProduct computes the inner product through a kernel trick
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// K(x, y) = exp(-gamma * ||x - y||^2)
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func (r *RBFKernel) InnerProduct(vectorX *mat64.Dense, vectorY *mat64.Dense) float64 {
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euclidean := NewEuclidean()
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distance := euclidean.Distance(vectorX, vectorY)
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result := math.Exp(-r.gamma * math.Pow(distance, 2))
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return result
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}
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