Update inversion_utils.py

inversion_utils.py

@@ -73,7 +73,7 @@ def sample_xts_from_x0(model, x0, num_inference_steps=50):
     betas = 1 - alphas
     variance_noise_shape = (
             num_inference_steps,
-            model.unet.in_channels, 
+            model.unet.config.in_channels, 
             model.unet.sample_size,
             model.unet.sample_size)