[paddlex] set 0 card default (#909)

Author: wangzhen38

uapi_rec/rank/runner.py

@@ -53,7 +53,7 @@ def train(self, config_path, cli_args, device, ips):
 
         paddle_pserver_ip_port = "127.0.0.1:29011"
         #gpus_list = "0,1,2,3,4,5,6,7"
-        gpus_list = "0,1"
+        gpus_list = "0"
         if "gpu" in device:
             gpus_list = device.lstrip("gpu:")
         server_echo = "PADDLE WILL START PSERVER 29011"