Update app.py

app.py

@@ -29,10 +29,12 @@
 
 import gradio as gr
 import os
-os.environ['SPCONV_ALGO'] = 'native'
-# Hi3DGen uses an attention backend that defaults to 'xformers', which requires an extra
-# dependency not installed in this Space.  Override the backend to use 'sdpa' instead.
-os.environ['ATTN_BACKEND'] = 'sdpa'
+
+# ---- Force CPU-only environment globally ----
+os.environ["CUDA_VISIBLE_DEVICES"] = "-1"          # hide any GPUs from torch
+os.environ.setdefault("ATTN_BACKEND", "sdpa")      # avoid xformers
+os.environ.setdefault("SPCONV_ALGO", "native")     # safe sparseconv algo
+# ---------------------------------------------
 from typing import *
 import torch
 import numpy as np