Do not set the default value of global random seed (#488)

python/sglang/srt/managers/controller/tp_worker.py

@@ -101,7 +101,8 @@ class ModelTpServer:
         self.int_token_logit_bias = torch.tensor(
             get_int_token_logit_bias(self.tokenizer, self.model_config.vocab_size)
         )
-        set_random_seed(server_args.random_seed)
+        if server_args.random_seed is not None:
+            set_random_seed(server_args.random_seed)
 
         # Print info
         logger.info(

python/sglang/srt/server_args.py

@@ -32,7 +32,7 @@ class ServerArgs:
     # Other runtime options
     tp_size: int = 1
     stream_interval: int = 8
-    random_seed: int = 42
+    random_seed: Optional[int] = None
 
     # Logging
     log_level: str = "info"
@@ -194,7 +194,7 @@ class ServerArgs:
             "--random-seed",
             type=int,
             default=ServerArgs.random_seed,
-            help="Random seed.",
+            help="The global random seed of the server.",
         )
         parser.add_argument(
             "--log-level",