feat: add ByteDance lightning preset, code cleanup

modules/async_worker.py

@@ -54,7 +54,6 @@ def worker():
     from modules.upscaler import perform_upscale
     from modules.flags import Performance, lora_count
     from modules.meta_parser import get_metadata_parser, MetadataScheme
-    from pathlib import Path
 
     pid = os.getpid()
     print(f'Started worker with PID {pid}')

presets/lightning.json

@@ -0,0 +1,47 @@
+{
+    "default_model": "sdxl_lightning_8step.safetensors",
+    "default_refiner": "None",
+    "default_refiner_switch": 0.5,
+    "default_loras": [
+        [
+            "None",
+            1.0
+        ],
+        [
+            "None",
+            1.0
+        ],
+        [
+            "None",
+            1.0
+        ],
+        [
+            "None",
+            1.0
+        ],
+        [
+            "None",
+            1.0
+        ]
+    ],
+    "default_cfg_scale": 1.0,
+    "default_sample_sharpness": 2.0,
+    "default_sampler": "euler",
+    "default_scheduler": "sgm_uniform",
+    "default_performance": "Speed",
+    "default_prompt": "",
+    "default_prompt_negative": "",
+    "default_styles": [
+        "Fooocus V2",
+        "Fooocus Enhance",
+        "Fooocus Sharp"
+    ],
+    "default_aspect_ratio": "1152*896",
+    "default_overwrite_step": 8,
+    "checkpoint_downloads": {
+        "sdxl_lightning_8step.safetensors": "https://huggingface.co/ByteDance/SDXL-Lightning/resolve/main/sdxl_lightning_8step.safetensors"
+    },
+    "embeddings_downloads": {},
+    "lora_downloads": {},
+    "previous_default_models": []
+}