[keras] Feed/get: now outputs tuples

keras.py

@@ -69,7 +69,7 @@ class KFeed(object):
         return tuple(v if isinstance(v, tuple) else (v,) for v in (self.x, self.y, self.w))
 
     def get(self, src):
-        return tuple(itemgetter(*v)(src) for v in self.xyw)
+        return tuple(tuple(src[k] for k in v) for v in self.xyw)
 
     @property
     def all(self):