fix abort in webui DDP mode

Former-commit-id: b90ac72d753b13a3eed9cb8b898fac2f2fe5153f

src/llamafactory/webui/utils.py

@@ -1,8 +1,10 @@
 import json
 import os
+import signal
 from datetime import datetime
 from typing import Any, Dict, List, Optional, Tuple
 
+import psutil
 from transformers.trainer_utils import get_last_checkpoint
 from yaml import safe_dump, safe_load
 
@@ -17,6 +19,18 @@ if is_gradio_available():
     import gradio as gr
 
 
+def abort_leaf_process(pid: int) -> None:
+    r"""
+    Aborts the leaf processes.
+    """
+    children = psutil.Process(pid).children()
+    if children:
+        for child in children:
+            abort_leaf_process(child.pid)
+    else:
+        os.kill(pid, signal.SIGABRT)
+
+
 def can_quantize(finetuning_type: str) -> "gr.Dropdown":
     r"""
     Judges if the quantization is available in this finetuning type.