update the example with the latest API

Author: helinwang

python/paddle/fluid/tests/book/word2vec/no_test_word2vec_new_api.py

@@ -94,7 +94,7 @@ def train(use_cuda, is_sparse, save_path):
     place = fluid.CUDAPlace(0) if use_cuda else fluid.CPUPlace()
 
     def event_handler(event):
-        if isinstance(event, fluid.EndPass):
+        if isinstance(event, fluid.Event.END_EPOCH):
             avg_cost = trainer.test(reader=paddle.dataset.imikolov.test(
                 word_dict, N))
 
@@ -106,10 +106,9 @@ def event_handler(event):
 
     trainer = fluid.Trainer(
         partial(inference_network, is_sparse),
-        optimizer=fluid.optimizer.SGD(learning_rate=0.001),
-        place=place,
-        event_handler=event_handler)
-    trainer.train(train_reader, 100)
+        fluid.optimizer.SGD(learning_rate=0.001),
+        place=place)
+    trainer.train(train_reader, 100, event_handler)
 
 
 def infer(use_cuda, save_path):