[extractor] modified type of returned score for DeepPixBiS, now a numpy array...

[extractor] modified type of returned score for DeepPixBiS, now a numpy array to be consistent with MCDeepPixBiS

bob/learn/pytorch/extractor/image/DeepPixBiS.py

@@ -107,5 +107,4 @@ class DeepPixBiSExtractor(Extractor):
       raise ValueError('Scoring method {} is not implemented.'.format(self.scoring_method))
 
     # output is a scalar score
-
-    return score
+    return np.reshape(score,(1,-1))