Fix setting fp16 dtype in AnimateDiff convert script. (huggingface#7127)

* update

* update

Author: DN6

scripts/convert_animatediff_motion_module_to_diffusers.py

@@ -30,6 +30,7 @@ def get_args():
     parser.add_argument("--output_path", type=str, required=True)
     parser.add_argument("--use_motion_mid_block", action="store_true")
     parser.add_argument("--motion_max_seq_length", type=int, default=32)
+    parser.add_argument("--save_fp16", action="store_true")
 
     return parser.parse_args()
 
@@ -48,4 +49,6 @@ def get_args():
     # skip loading position embeddings
     adapter.load_state_dict(conv_state_dict, strict=False)
     adapter.save_pretrained(args.output_path)
-    adapter.save_pretrained(args.output_path, variant="fp16", torch_dtype=torch.float16)
+
+    if args.save_fp16:
+        adapter.to(torch.float16).save_pretrained(args.output_path, variant="fp16")