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confusion_matrix.go
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/
confusion_matrix.go
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package metrics
import (
"fmt"
"strings"
)
type ConfusionMatrix struct {
matrix [][]int
labels []string
}
func NewConfusionMatrix(actual, predicted []string, labels []string) *ConfusionMatrix {
n := len(labels)
matrix := make([][]int, n)
for i := range matrix {
matrix[i] = make([]int, n)
}
labelIndices := make(map[string]int)
for i, label := range labels {
labelIndices[label] = i
}
for i := range actual {
matrix[labelIndices[actual[i]]][labelIndices[predicted[i]]]++
}
return &ConfusionMatrix{
matrix: matrix,
labels: labels,
}
}
func (cm *ConfusionMatrix) PrintConfusionMatrix() string {
var s strings.Builder
s.WriteString(fmt.Sprintf("%30s\n", "Confusion Matrix"))
s.WriteString(fmt.Sprintln())
// Print header
s.WriteString(fmt.Sprintf("%-15s", ""))
for _, label := range cm.labels {
s.WriteString(fmt.Sprintf("%-15s", label))
}
s.WriteString(fmt.Sprintln())
// Print rows
for i, row := range cm.matrix {
s.WriteString(fmt.Sprintf("%-15s", cm.labels[i]))
for _, value := range row {
s.WriteString(fmt.Sprintf("%-15d", value))
}
s.WriteString(fmt.Sprintln())
}
s.WriteString(fmt.Sprintln())
return s.String()
}