Safetensor loading in AnimateDiff conversion scripts (#7764)

* update

* update

scripts/convert_animatediff_motion_lora_to_diffusers.py

 import argparse
 
 import torch
-from safetensors.torch import save_file
+from safetensors.torch import load_file, save_file
 
 
 def convert_motion_module(original_state_dict):
@@ -34,7 +34,10 @@ def get_args():
 if __name__ == "__main__":
     args = get_args()
 
-    state_dict = torch.load(args.ckpt_path, map_location="cpu")
+    if args.ckpt_path.endswith(".safetensors"):
+        state_dict = load_file(args.ckpt_path)
+    else:
+        state_dict = torch.load(args.ckpt_path, map_location="cpu")
 
     if "state_dict" in state_dict.keys():
         state_dict = state_dict["state_dict"]

scripts/convert_animatediff_motion_module_to_diffusers.py

 import argparse
 
 import torch
+from safetensors.torch import load_file
 
 from diffusers import MotionAdapter
 
@@ -38,7 +39,11 @@ def get_args():
 if __name__ == "__main__":
     args = get_args()
 
-    state_dict = torch.load(args.ckpt_path, map_location="cpu")
+    if args.ckpt_path.endswith(".safetensors"):
+        state_dict = load_file(args.ckpt_path)
+    else:
+        state_dict = torch.load(args.ckpt_path, map_location="cpu")
+
     if "state_dict" in state_dict.keys():
         state_dict = state_dict["state_dict"]