Add customized sampler registration (#15423)

python/sglang/srt/model_executor/model_runner.py

@@ -99,7 +99,7 @@ from sglang.srt.layers.dp_attention import (
 from sglang.srt.layers.logits_processor import LogitsProcessorOutput
 from sglang.srt.layers.pooler import EmbeddingPoolerOutput
 from sglang.srt.layers.quantization.fp8_kernel import fp8_dtype
-from sglang.srt.layers.sampler import Sampler
+from sglang.srt.layers.sampler import create_sampler
 from sglang.srt.layers.torchao_utils import apply_torchao_config_to_model
 from sglang.srt.lora.lora_manager import LoRAManager
 from sglang.srt.lora.lora_registry import LoRARef
@@ -451,7 +451,7 @@ class ModelRunner:
             else None
         )
         # Load the model
-        self.sampler = Sampler()
+        self.sampler = create_sampler()
         self.load_model()
 
         if (