fix bs multiprocessing problem

demo/serving/bert_service/README.md

@@ -179,18 +179,22 @@ Server[baidu::paddle_serving::predictor::bert_service::BertServiceImpl] is servi
 
 首先导入客户端依赖。  
 ```python
-from paddlehub.serving.bert_serving import bert_service
+from paddlehub.serving.bert_serving import bs_client
 ```
-接着输入文本信息。
+
+接着启动并初始化`bert service`客户端`BSClient`(这里的server为虚拟地址，需根据自己实际ip设置)
+```python
+bc = bs_client.BSClient(module_name="ernie_tiny", server="127.0.0.1:8866")
+```
+
+然后输入文本信息。
 ```python
 input_text = [["西风吹老洞庭波"], ["一夜湘君白发多"], ["醉后不知天在水"], ["满船清梦压星河"], ]
 ```
-然后利用客户端接口发送文本到服务端，以获取embedding结果(server为虚拟地址，需根据自己实际ip设置)。
+
+最后利用客户端接口`get_result`发送文本到服务端，以获取embedding结果。
 ```python
-result = bert_service.connect(
-    input_text=input_text,
-    model_name="ernie_tiny",
-    server="127.0.0.1:8866")
+result = bc.get_result(input_text=input_text)
 ```
 最后即可得到embedding结果(此处只展示部分结果)。
 ```python
@@ -229,8 +233,8 @@ Paddle Inference Server exit successfully!
  browser."，这个页面有什么作用。  
 > A : 这是`BRPC`的内置服务，主要用于查看请求数、资源占用等信息，可对server端性能有大致了解，具体信息可查看[BRPC内置服务](https://github.com/apache/incubator-brpc/blob/master/docs/cn/builtin_service.md)。
 
-> Q : 为什么输入文本的格式为[["文本1"], ["文本2"], ]，而不是["文本1", "文本2", ]？  
-> A : 因为Bert模型可以对一轮对话生成向量表示，例如[["问题1","回答1"],["问题2","回答2"]]，为了防止使用时混乱，每个样本使用一个list表示，一个样本list内部可以是1条string或2条string，如下面的文本：
+> Q : 为什么输入文本的格式为[["文本1"], ["文本2"], ]，而不是["文本1", "文本2", ]？
+> A : 因为Bert模型可以对一轮对话生成向量表示，例如[["问题1","回答1"],["问题2","回答2"]]，为了防止使用时混乱，每个样本使用一个list表示，一个样本list内部可以是1条string或2条string，如下面的文本：  
 > ```python
 > input_text = [
 >    ["你今天吃饭了吗","我已经吃过饭了"],

demo/serving/bert_service/bert_service_client.py

 # coding: utf8
-from paddlehub.serving.bert_serving import bert_service
+from paddlehub.serving.bert_serving import bs_client
 
 if __name__ == "__main__":
+    # 初始化bert_service客户端BSClient
+    bc = bs_client.BSClient(module_name="ernie_tiny", server="127.0.0.1:8866")
+
     # 输入要做embedding的文本
     # 文本格式为[["文本1"], ["文本2"], ]
     input_text = [
@@ -10,10 +13,10 @@ if __name__ == "__main__":
         ["醉后不知天在水"],
         ["满船清梦压星河"],
     ]
-    # 调用客户端接口bert_service.connect()获取结果
-    result = bert_service.connect(
-        input_text=input_text, model_name="ernie_tiny", server="127.0.0.1:8866")
 
-    # 打印embedding结果
+    # BSClient.get_result()获取结果
+    result = bc.get_result(input_text=input_text)
+
+    # 打印输入文本的embedding结果
     for item in result:
         print(item)

paddlehub/serving/bert_serving/bert_service.py

@@ -14,7 +14,6 @@
 # limitations under the License.
 
 import sys
-import time
 import paddlehub as hub
 import ujson
 import random
@@ -30,7 +29,7 @@ if is_py3:
     import http.client as httplib
 
 
-class BertService():
+class BertService(object):
     def __init__(self,
                  profile=False,
                  max_seq_len=128,
@@ -42,7 +41,7 @@ class BertService():
                  load_balance='round_robin'):
         self.process_id = process_id
         self.reader_flag = False
-        self.batch_size = 16
+        self.batch_size = 0
         self.max_seq_len = max_seq_len
         self.profile = profile
         self.model_name = model_name
@@ -55,34 +54,29 @@ class BertService():
         self.feed_var_names = ''
         self.retry = retry
 
-    def connect(self, server='127.0.0.1:8010'):
+        module = hub.Module(name=self.model_name)
+        inputs, outputs, program = module.context(
+            trainable=True, max_seq_len=self.max_seq_len)
+        input_ids = inputs["input_ids"]
+        position_ids = inputs["position_ids"]
+        segment_ids = inputs["segment_ids"]
+        input_mask = inputs["input_mask"]
+        self.feed_var_names = input_ids.name + ';' + position_ids.name + ';' + segment_ids.name + ';' + input_mask.name
+        self.reader = hub.reader.ClassifyReader(
+            vocab_path=module.get_vocab_path(),
+            dataset=None,
+            max_seq_len=self.max_seq_len,
+            do_lower_case=self.do_lower_case)
+        self.reader_flag = True
+
+    def add_server(self, server='127.0.0.1:8010'):
         self.server_list.append(server)
 
-    def connect_all_server(self, server_list):
+    def add_server_list(self, server_list):
         for server_str in server_list:
             self.server_list.append(server_str)
 
-    def data_convert(self, text):
-        if self.reader_flag == False:
-            module = hub.Module(name=self.model_name)
-            inputs, outputs, program = module.context(
-                trainable=True, max_seq_len=self.max_seq_len)
-            input_ids = inputs["input_ids"]
-            position_ids = inputs["position_ids"]
-            segment_ids = inputs["segment_ids"]
-            input_mask = inputs["input_mask"]
-            self.feed_var_names = input_ids.name + ';' + position_ids.name + ';' + segment_ids.name + ';' + input_mask.name
-            self.reader = hub.reader.ClassifyReader(
-                vocab_path=module.get_vocab_path(),
-                dataset=None,
-                max_seq_len=self.max_seq_len,
-                do_lower_case=self.do_lower_case)
-            self.reader_flag = True
-
-        return self.reader.data_generator(
-            batch_size=self.batch_size, phase='predict', data=text)
-
-    def infer(self, request_msg):
+    def request_server(self, request_msg):
         if self.load_balance == 'round_robin':
             try:
                 cur_con = httplib.HTTPConnection(
@@ -157,17 +151,13 @@ class BertService():
                         self.server_list)
                     return 'retry'
 
-    def encode(self, text):
-        if type(text) != list:
-            raise TypeError('Only support list')
+    def prepare_data(self, text):
         self.batch_size = len(text)
-        data_generator = self.data_convert(text)
-        start = time.time()
-        request_time = 0
-        result = []
+        data_generator = self.reader.data_generator(
+            batch_size=self.batch_size, phase='predict', data=text)
+        request_msg = ""
         for run_step, batch in enumerate(data_generator(), start=1):
             request = []
-            copy_start = time.time()
             token_list = batch[0][0].reshape(-1).tolist()
             pos_list = batch[0][1].reshape(-1).tolist()
             sent_list = batch[0][2].reshape(-1).tolist()
@@ -184,54 +174,34 @@ class BertService():
                     si + 1) * self.max_seq_len]
                 request.append(instance_dict)
 
-            copy_time = time.time() - copy_start
             request = {"instances": request}
             request["max_seq_len"] = self.max_seq_len
             request["feed_var_names"] = self.feed_var_names
             request_msg = ujson.dumps(request)
             if self.show_ids:
                 logger.info(request_msg)
-            request_start = time.time()
-            response_msg = self.infer(request_msg)
-            retry = 0
-            while type(response_msg) == str and response_msg == 'retry':
-                if retry < self.retry:
-                    retry += 1
-                    logger.info('Try to connect another servers')
-                    response_msg = self.infer(request_msg)
-                else:
-                    logger.error('Infer failed after {} times retry'.format(
-                        self.retry))
-                    break
-            for msg in response_msg["instances"]:
-                for sample in msg["instances"]:
-                    result.append(sample["values"])
-
-            request_time += time.time() - request_start
-        total_time = time.time() - start
-        if self.profile:
-            return [
-                total_time, request_time, response_msg['op_time'],
-                response_msg['infer_time'], copy_time
-            ]
-        else:
-            return result
-
-
-def connect(input_text,
-            model_name,
-            max_seq_len=128,
-            show_ids=False,
-            do_lower_case=True,
-            server="127.0.0.1:8866",
-            retry=3):
-    # format of input_text like [["As long as"],]
-    bc = BertService(
-        max_seq_len=max_seq_len,
-        model_name=model_name,
-        show_ids=show_ids,
-        do_lower_case=do_lower_case,
-        retry=retry)
-    bc.connect(server)
-    result = bc.encode(input_text)
-    return result
+
+        return request_msg
+
+    def encode(self, text):
+        if type(text) != list:
+            raise TypeError('Only support list')
+        request_msg = self.prepare_data(text)
+
+        response_msg = self.request_server(request_msg)
+        retry = 0
+        while type(response_msg) == str and response_msg == 'retry':
+            if retry < self.retry:
+                retry += 1
+                logger.info('Try to connect another servers')
+                response_msg = self.request_server(request_msg)
+            else:
+                logger.error('Request failed after {} times retry'.format(
+                    self.retry))
+                break
+        result = []
+        for msg in response_msg["instances"]:
+            for sample in msg["instances"]:
+                result.append(sample["values"])
+
+        return result

paddlehub/serving/bert_serving/bs_client.py

+from paddlehub.serving.bert_serving import bert_service
+
+
+class BSClient(object):
+    def __init__(self,
+                 module_name,
+                 server,
+                 max_seq_len=20,
+                 show_ids=False,
+                 do_lower_case=True,
+                 retry=3):
+        self.bs = bert_service.BertService(
+            model_name=module_name,
+            max_seq_len=max_seq_len,
+            show_ids=show_ids,
+            do_lower_case=do_lower_case,
+            retry=retry)
+        self.bs.add_server(server=server)
+
+    def get_result(self, input_text):
+        return self.bs.encode(input_text)