use gpu

app.py

@@ -4,6 +4,13 @@ import tempfile
 
 
 def generate():
+    bpy.context.scene.cycles.device = 'GPU'
+    
+    prefs = bpy.context.preferences
+    prefs.addons['cycles'].preferences.get_devices()    
+    for device in prefs.addons['cycles'].preferences.devices:
+        device.use = True
+    
     with tempfile.NamedTemporaryFile(suffix=".JPEG", delete=False) as f:
         bpy.context.scene.render.resolution_y = 200
         bpy.context.scene.render.resolution_x = 400