fix(inferer): fix issues

microservices/inferer/inferer.py

@@ -48,7 +48,7 @@ class InfererServicer(inferer_pb2_grpc.InfererServicer):
 
 def serve():
     server = grpc.server(futures.ThreadPoolExecutor(max_workers=1))
-    inferer_pb2_grpc.add_InfererServicer_to_server(inferer_pb2_grpc.InfererServicer(), server)
+    inferer_pb2_grpc.add_InfererServicer_to_server(InfererServicer(), server)
     server.add_insecure_port('[::]:80')
     server.start()
     server.wait_for_termination()