Merge pull request #12630 from catboxanon/fix/nans-mk2

Attempt to resolve NaN issue with unstable VAEs in fp32 mk2

modules/sd_samplers_common.py

@@ -49,7 +49,8 @@ def samples_to_images_tensor(sample, approximation=None, model=None):
     else:
         if model is None:
             model = shared.sd_model
-        x_sample = model.decode_first_stage(sample.to(model.first_stage_model.dtype))
+        with devices.without_autocast(): # fixes an issue with unstable VAEs that are flaky even in fp32
+            x_sample = model.decode_first_stage(sample.to(model.first_stage_model.dtype))
 
     return x_sample