From 9a15af88d7f397c4ddd280db71b9dd3e93f6abcf Mon Sep 17 00:00:00 2001
From: x54-729 <17307130121@fudan.edu.cn>
Date: Tue, 10 May 2022 08:10:48 +0000
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---
 fastNLP/envs/set_backend.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fastNLP/envs/set_backend.py b/fastNLP/envs/set_backend.py
index e6b9bf59..d925d282 100644
--- a/fastNLP/envs/set_backend.py
+++ b/fastNLP/envs/set_backend.py
@@ -101,6 +101,11 @@ def _set_backend():
     elif backend == 'torch':
         assert _module_available(backend), f"You must have {backend} available to use {backend} backend."
 
+    if 'PADDLE_RANK_IN_NODE' in os.environ and 'FLAGS_selected_gpus' in os.environ \
+        and "USER_CUDA_VISIBLE_DEVICES" not in os.environ:
+        # 当用户没有设置 backend 并且使用 launch 启动了多卡，应该提醒用户进行设置
+        raise RuntimeError("To run paddle distributed training, please set `FASTNLP_BACKEND` to 'paddle' before using FastNLP.")
+
 
 def set_env(global_seed=None):
     """