Allow batch size 1

trainer/src/Trainer.cpp

@@ -82,6 +82,8 @@ float Trainer::epoch(bool printAdvancement)
 
     auto prediction = machine.getClassifier()->getNN()(data);
 
+    labels = labels.reshape(labels.dim() == 0 ? 1 : labels.size(0));
+
     auto loss = lossFct(prediction, labels);
     try
     {