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package main
import (
"testing"
"github.com/gonum/matrix/mat64"
)
const EPSILON float64 = 0.00000001
func floatDiffers(a, b float64) bool {
if (a-b) < EPSILON && (b-a) < EPSILON {
return false
}
return true
}
func TestCostFunction(t *testing.T) {
for _, test := range []struct {
x *mat64.Dense
y *mat64.Vector
theta *mat64.Vector
expectedCost float64
}{
{
mat64.NewDense(4, 2, []float64{1, 2, 1, 3, 1, 4, 1, 5}),
mat64.NewVector(4, []float64{7, 6, 5, 4}),
mat64.NewVector(2, []float64{0.1, 0.2}),
11.9450,
}, {
mat64.NewDense(4, 3, []float64{1, 2, 3, 1, 3, 4, 1, 4, 5, 1, 5, 6}),
mat64.NewVector(4, []float64{7, 6, 5, 4}),
mat64.NewVector(3, []float64{0.1, 0.2, 0.3}),
7.0175,
},
} {
cost := Cost(test.x, test.y, test.theta)
if floatDiffers(cost, test.expectedCost) {
t.Errorf("Cost is expected to be equal to %v, found %v", test.expectedCost, cost)
}
}
}