move sigma_min, sigma_max to scheduler config

scheduler/scheduler_config.json

@@ -5,5 +5,7 @@
   "trained_betas": null,
   "num_train_timesteps": 1024,
   "prediction_type": "sample",
-  "use_karras_sigmas": false
+  "use_karras_sigmas": true,
+  "sigma_max": 160,
+  "sigma_min": 1e-3
 }