Fix validate for single return.

Author: Xreki

graph_net/paddle/validate.py

@@ -66,13 +66,13 @@ def main(args):
     params.update(inputs)
     state_dict = {k: utils.replay_tensor(v) for k, v in params.items()}
 
-    y = model(**state_dict)[0]
+    y = model(**state_dict)
 
-    print(np.argmin(y), np.argmax(y))
+    # print(np.argmin(y), np.argmax(y))
     if isinstance(y, paddle.Tensor):
         print(y.shape)
     elif isinstance(y, list) or isinstance(y, tuple):
-        print(y[0].shape if isinstance(y[0], paddle.tensor) else y[0])
+        print(y[0].shape if isinstance(y[0], paddle.Tensor) else y[0])
     else:
         raise ValueError("Illegal return value.")