Uncommented an import in test_metrics.py
Uncommented an import in test_metrics.py

villalonreina/dipy,villalonreina/dipy,nilgoyyou/dipy,matthieudumont/dipy,FrancoisRheaultUS/dipy,matthieudumont/dipy,nilgoyyou/dipy,FrancoisRheaultUS/dipy,StongeEtienne/dipy,StongeEtienne/dipy