experimental optimization

modules/processing.py

@@ -544,6 +544,29 @@ def process_images_inner(p: StableDiffusionProcessing) -> Processed:
     infotexts = []
     output_images = []
 
+    cached_uc = [None, None]
+    cached_c = [None, None]
+
+    def get_conds_with_caching(function, required_prompts, steps, cache):
+        """
+        Returns the result of calling function(shared.sd_model, required_prompts, steps)
+        using a cache to store the result if the same arguments have been used before.
+
+        cache is an array containing two elements. The first element is a tuple
+        representing the previously used arguments, or None if no arguments
+        have been used before. The second element is where the previously
+        computed result is stored.
+        """
+
+        if cache[0] is not None and (required_prompts, steps) == cache[0]:
+            return cache[1]
+
+        with devices.autocast():
+            cache[1] = function(shared.sd_model, required_prompts, steps)
+
+        cache[0] = (required_prompts, steps)
+        return cache[1]
+
     with torch.no_grad(), p.sd_model.ema_scope():
         with devices.autocast():
             p.init(p.all_prompts, p.all_seeds, p.all_subseeds)
@@ -571,9 +594,8 @@ def process_images_inner(p: StableDiffusionProcessing) -> Processed:
             if p.scripts is not None:
                 p.scripts.process_batch(p, batch_number=n, prompts=prompts, seeds=seeds, subseeds=subseeds)
 
-            with devices.autocast():
-                uc = prompt_parser.get_learned_conditioning(shared.sd_model, negative_prompts, p.steps)
-                c = prompt_parser.get_multicond_learned_conditioning(shared.sd_model, prompts, p.steps)
+            uc = get_conds_with_caching(prompt_parser.get_learned_conditioning, negative_prompts, p.steps, cached_uc)
+            c = get_conds_with_caching(prompt_parser.get_multicond_learned_conditioning, prompts, p.steps, cached_c)
 
             if len(model_hijack.comments) > 0:
                 for comment in model_hijack.comments: