mute SDXL imports in the place there SDXL is imported for the first time instead of launch.py

modules/paths.py

@@ -5,6 +5,21 @@ from modules.paths_internal import models_path, script_path, data_path, extensio
 import modules.safe  # noqa: F401
 
 
+def mute_sdxl_imports():
+    """create fake modules that SDXL wants to import but doesn't actually use for our purposes"""
+
+    class Dummy:
+        pass
+
+    module = Dummy()
+    module.LPIPS = None
+    sys.modules['taming.modules.losses.lpips'] = module
+
+    module = Dummy()
+    module.StableDataModuleFromConfig = None
+    sys.modules['sgm.data'] = module
+
+
 # data_path = cmd_opts_pre.data
 sys.path.insert(0, script_path)
 
@@ -18,6 +33,8 @@ for possible_sd_path in possible_sd_paths:
 
 assert sd_path is not None, f"Couldn't find Stable Diffusion in any of: {possible_sd_paths}"
 
+mute_sdxl_imports()
+
 path_dirs = [
     (sd_path, 'ldm', 'Stable Diffusion', []),
     (os.path.join(sd_path, '../generative-models'), 'sgm', 'Stable Diffusion XL', ["sgm"]),