Keep read bytes instead of file objects

SMVB.py

@@ -135,6 +135,7 @@ class SMVBDataset(datasets.GeneratorBasedBuilder):
 
         for i, info in enumerate(data):
             if file_infos and i%len(keys) == 0:
-                yield (i//len(keys))-1, {k:{'path':d[0],'bytes':d[1].read()} for k,d in zip(keys,file_infos)}
+                yield (i//len(keys))-1, {k:{'path':d[0],'bytes':d[1]} for k,d in zip(keys,file_infos)}
                 file_infos = []
-            file_infos.append(info)
+            file_path, file_object = info
+            file_infos.append((file_path, file_object.read()))