[Feature] Add a function to convert sampling_params to kwargs (#1170)

Co-authored-by: lzhang <zhanglei@modelbest.cn>

python/sglang/srt/sampling_params.py

@@ -123,3 +123,17 @@ class SamplingParams:
                 else:
                     stop_str_max_len = max(stop_str_max_len, len(stop_str))
             self.stop_str_max_len = stop_str_max_len
+
+    def to_srt_kwargs(self):
+        return {
+            "max_new_tokens": self.max_new_tokens,
+            "stop": self.stop_strs,
+            "stop_token_ids": list(self.stop_token_ids),
+            "temperature": self.temperature,
+            "top_p": self.top_p,
+            "top_k": self.top_k,
+            "frequency_penalty": self.frequency_penalty,
+            "presence_penalty": self.presence_penalty,
+            "ignore_eos": self.ignore_eos,
+            "regex": self.regex,
+        }