delete the field that is preventing the model from being unloaded and is...

delete the field that is preventing the model from being unloaded and is causing increased RAM usage

modules/processing.py

@@ -1076,11 +1076,15 @@ class StableDiffusionProcessingTxt2Img(StableDiffusionProcessing):
         current = shared.sd_model.sd_checkpoint_info
         try:
             if self.hr_checkpoint_info is not None:
+                del self.sampler
                 sd_models.reload_model_weights(info=self.hr_checkpoint_info)
+                devices.torch_gc()
 
             return self.sample_hr_pass(samples, decoded_samples, seeds, subseeds, subseed_strength, prompts)
         finally:
+            del self.sampler
             sd_models.reload_model_weights(info=current)
+            devices.torch_gc()
 
     def sample_hr_pass(self, samples, decoded_samples, seeds, subseeds, subseed_strength, prompts):
         self.is_hr_pass = True