update train hparams

src/llamafactory/webui/runner.py

@@ -200,7 +200,7 @@ class Runner:
         # eval config
         if get("train.val_size") > 1e-6 and args["stage"] != "ppo":
             args["val_size"] = get("train.val_size")
-            args["evaluation_strategy"] = "steps"
+            args["eval_strategy"] = "steps"
             args["eval_steps"] = args["save_steps"]
             args["per_device_eval_batch_size"] = args["per_device_train_batch_size"]