feat: add performance lightning with 4 step LoRA (#2415)

* feat: add performance sdxl lightning

based on https://huggingface.co/ByteDance/SDXL-Lightning/blob/main/sdxl_lightning_4step_lora.safetensors

* feat: add method for centralized restriction of features for specific performance modes

* feat: add lightning preset

modules/async_worker.py

@@ -250,6 +250,25 @@ def worker():
             adm_scaler_negative = 1.0
             adm_scaler_end = 0.0
 
+        elif performance_selection == Performance.LIGHTNING:
+            print('Enter Lightning mode.')
+            progressbar(async_task, 1, 'Downloading Lightning components ...')
+            loras += [(modules.config.downloading_sdxl_lightning_lora(), 1.0)]
+
+            if refiner_model_name != 'None':
+                print(f'Refiner disabled in Lightning mode.')
+
+            refiner_model_name = 'None'
+            sampler_name = 'euler'
+            scheduler_name = 'sgm_uniform'
+            sharpness = 0.0
+            guidance_scale = 1.0
+            adaptive_cfg = 1.0
+            refiner_switch = 1.0
+            adm_scaler_positive = 1.0
+            adm_scaler_negative = 1.0
+            adm_scaler_end = 0.0
+
         print(f'[Parameters] Adaptive CFG = {adaptive_cfg}')
         print(f'[Parameters] Sharpness = {sharpness}')
         print(f'[Parameters] ControlNet Softness = {controlnet_softness}')

modules/config.py

@@ -475,6 +475,7 @@ with open(config_example_path, "w", encoding="utf-8") as json_file:
 model_filenames = []
 lora_filenames = []
 sdxl_lcm_lora = 'sdxl_lcm_lora.safetensors'
+sdxl_lightning_lora = 'sdxl_lightning_4step_lora.safetensors'
 
 
 def get_model_filenames(folder_paths, name_filter=None):
@@ -538,6 +539,14 @@ def downloading_sdxl_lcm_lora():
     )
     return sdxl_lcm_lora
 
+def downloading_sdxl_lightning_lora():
+    load_file_from_url(
+        url='https://huggingface.co/ByteDance/SDXL-Lightning/resolve/main/sdxl_lightning_4step_lora.safetensors',
+        model_dir=paths_loras[0],
+        file_name=sdxl_lightning_lora
+    )
+    return sdxl_lightning_lora
+
 
 def downloading_controlnet_canny():
     load_file_from_url(

modules/flags.py

@@ -106,23 +106,32 @@ class Steps(IntEnum):
     QUALITY = 60
     SPEED = 30
     EXTREME_SPEED = 8
+    LIGHTNING = 4
 
 
 class StepsUOV(IntEnum):
     QUALITY = 36
     SPEED = 18
     EXTREME_SPEED = 8
+    LIGHTNING = 4
 
 
 class Performance(Enum):
     QUALITY = 'Quality'
     SPEED = 'Speed'
     EXTREME_SPEED = 'Extreme Speed'
+    LIGHTNING = 'Lightning'
 
     @classmethod
     def list(cls) -> list:
         return list(map(lambda c: c.value, cls))
 
+    @classmethod
+    def has_restricted_features(cls, x) -> bool:
+        if isinstance(x, Performance):
+            x = x.value
+        return x in [cls.EXTREME_SPEED.value, cls.LIGHTNING.value]
+
     def steps(self) -> int | None:
         return Steps[self.name].value if Steps[self.name] else None