add checkpoint_load to python framework

python/paddle/fluid/framework.py

@@ -489,7 +489,8 @@ class Operator(object):
             'rnn_memory_helper_grad', 'conditional_block', 'while', 'send',
             'recv', 'listen_and_serv', 'parallel_do', 'save_combine',
             'load_combine', 'ncclInit', 'channel_create', 'channel_close',
-            'channel_send', 'channel_recv', 'select', 'checkpoint_save'
+            'channel_send', 'channel_recv', 'select', 'checkpoint_save',
+            'checkpoint_save'
         }
         if type not in no_kernel_op_set:
             self.desc.infer_var_type(self.block.desc)