update async_executor.py for support set_use_slots

python/paddle/fluid/async_executor.py

@@ -30,16 +30,24 @@ g_scope = core.Scope()
 class DataFeedDesc(object):
     def __init__(self, proto_file):
         self.proto_desc = data_feed_pb2.DataFeedDesc()
-        f = open(proto_file, 'r')
+        with open(proto_file, 'r') as f:
             text_format.Parse(f.read(), self.proto_desc)
-        f.close()
+        self.__name_to_index = {}
+        for i, slot in enumerate(self.proto_desc.multi_slot_desc.slots):
+            self.__name_to_index[slot.name] = i
+
+    def set_data_feed_type(self, data_feed):
+        self.proto_desc.name = datafeed
 
     def set_batch_size(self, batch_size):
         self.proto_desc.batch = batch_size
 
-    def add_slot(self):
-        slot = self.proto_desc.multi_slot_desc.slots.add()
-        return slot
+    def get_slot(self, name):
+        return self.proto_desc.multi_slot_desc.slots[self.__name_to_index[name]]
+
+    def set_use_slots(self, use_slots_name):
+        for name in use_slots_name:
+            self.proto_desc.multi_slot_desc.slots[self.__name_to_index[name]].use = True
 
     def desc(self):
         return text_format.MessageToString(self.proto_desc)