res := getTopFiveLabels(labels, output[0].Value().([][]float32)[0])
for _, l := range res {
	fmt.Printf("label: %s, probability: %.2f%%\n", l.Label, l.Probability*100)
}

func getTopFiveLabels(labels []string, probabilities []float32) []Label {
	var resultLabels []Label
	for i, p := range probabilities {
		if i >= len(labels) {
			break
		}
		resultLabels = append(resultLabels, Label{Label: labels[i], Probability: p})
	}

	sort.Sort(Labels(resultLabels))
	return resultLabels[:5]
}