fix bugs of pyg backend

autogl/module/train/graph_classification_full.py

@@ -314,6 +314,7 @@ class GraphClassificationFullTrainer(BaseGraphClassificationTrainer):
             if self.pyg_dgl == 'pyg':
                 data = data.to(self.device)
                 pred.append(self.model.model(data))
+                label.append(data.y)
             elif self.pyg_dgl == 'dgl':
                 data = [data[i].to(self.device) for i in range(len(data))]
                 _, labels = data