fix bert demo

python/examples/bert/README.md

@@ -42,7 +42,7 @@ pip install paddle_serving_app
 ```
 执行
 ```
-cat data-c.txt | python bert_client.py 
+head data-c.txt | python bert_client.py --model bert_seq20_client/serving_client_conf.prototxt
 ```
 启动client读取data-c.txt中的数据进行预测，预测结果为文本的向量表示（由于数据较多，脚本中没有将输出进行打印），server端的地址在脚本中修改。
 

python/examples/bert/bert_client.py

@@ -29,13 +29,13 @@ from paddle_serving_app import ChineseBertReader
 
 args = benchmark_args()
 
-reader = ChineseBertReader(max_seq_len=20)
+reader = ChineseBertReader({"max_seq_len": 20})
 fetch = ["pooled_output"]
 endpoint_list = ["127.0.0.1:9292"]
 client = Client()
 client.load_client_config(args.model)
 client.connect(endpoint_list)
 
-for line in fin:
+for line in sys.stdin:
     feed_dict = reader.process(line)
     result = client.predict(feed=feed_dict, fetch=fetch)