Update app.py

app.py

@@ -3,7 +3,7 @@ import os, shutil, subprocess, zipfile
 from pathlib import Path
 import gradio as gr
 
-ROOT   = Path(_file_).resolve().parent           # /home/user/app
+ROOT   = Path(__file__).resolve().parent           # /home/user/app
 DATA   = ROOT / "dataset.jsonl"
 LOG    = ROOT / "train.log"
 OUT    = ROOT / "trained_model"