Fix SD VAE switch error after model reuse

modules/sd_models.py

@@ -462,6 +462,7 @@ class SdModelData:
     def __init__(self):
         self.sd_model = None
         self.loaded_sd_models = []
+        self.loaded_vae_states = {}
         self.was_loaded_at_least_once = False
         self.lock = threading.Lock()
 
@@ -485,16 +486,27 @@ class SdModelData:
 
         return self.sd_model
 
-    def set_sd_model(self, v):
+    def set_sd_model(self, v, already_loaded=False):
         self.sd_model = v
+        if already_loaded:
+            sd_vae_state = self.loaded_vae_states.get(v.sd_model_hash, {})
+            sd_vae.base_vae = sd_vae_state.get("base_vae", None)
+            sd_vae.loaded_vae_file = sd_vae_state.get("loaded_vae_file", None)
+            sd_vae.checkpoint_info = sd_vae_state.get("checkpoint_info", None)
 
         try:
             self.loaded_sd_models.remove(v)
+            self.loaded_vae_states.pop(v.sd_model_hash, {}).clear()
         except ValueError:
             pass
 
         if v is not None:
             self.loaded_sd_models.insert(0, v)
+            self.loaded_vae_states[v.sd_model_hash] = dict(
+                base_vae=sd_vae.base_vae,
+                loaded_vae_file=sd_vae.loaded_vae_file,
+                checkpoint_info=sd_vae.checkpoint_info,
+            )
 
 
 model_data = SdModelData()
@@ -649,6 +661,7 @@ def reuse_model_from_already_loaded(sd_model, checkpoint_info, timer):
         if len(model_data.loaded_sd_models) > shared.opts.sd_checkpoints_limit > 0:
             print(f"Unloading model {len(model_data.loaded_sd_models)} over the limit of {shared.opts.sd_checkpoints_limit}: {loaded_model.sd_checkpoint_info.title}")
             model_data.loaded_sd_models.pop()
+            model_data.loaded_vae_states.pop(loaded_model.sd_model_hash, {}).clear()
             send_model_to_trash(loaded_model)
             timer.record("send model to trash")
 
@@ -660,7 +673,7 @@ def reuse_model_from_already_loaded(sd_model, checkpoint_info, timer):
         send_model_to_device(already_loaded)
         timer.record("send model to device")
 
-        model_data.set_sd_model(already_loaded)
+        model_data.set_sd_model(already_loaded, already_loaded=True)
 
         if not SkipWritingToConfig.skip:
             shared.opts.data["sd_model_checkpoint"] = already_loaded.sd_checkpoint_info.title
@@ -678,6 +691,11 @@ def reuse_model_from_already_loaded(sd_model, checkpoint_info, timer):
         sd_model = model_data.loaded_sd_models.pop()
         model_data.sd_model = sd_model
 
+        sd_vae_state = model_data.loaded_vae_states.pop(sd_model.sd_model_hash, {})
+        sd_vae.base_vae = sd_vae_state.get("base_vae", None)
+        sd_vae.loaded_vae_file = sd_vae_state.get("loaded_vae_file", None)
+        sd_vae.checkpoint_info = sd_vae_state.get("checkpoint_info", None)
+
         print(f"Reusing loaded model {sd_model.sd_checkpoint_info.title} to load {checkpoint_info.title}")
         return sd_model
     else: