add a way to specify the subfolder of the unet

(no subfolder -> pass an empty string)

scripts/conversion/convert_diffusers_unet.py

@@ -12,6 +12,7 @@
 class Args(argparse.Namespace):
     source_path: str
     output_path: str | None
+    subfolder: str | None
     half: bool
     verbose: bool
 
@@ -20,7 +21,7 @@ def setup_converter(args: Args) -> ModelConverter:
     # low_cpu_mem_usage=False stops some annoying console messages us to `pip install accelerate`
     source: nn.Module = UNet2DConditionModel.from_pretrained(  # type: ignore
         pretrained_model_name_or_path=args.source_path,
-        subfolder="unet",
+        subfolder=args.subfolder,
         low_cpu_mem_usage=False,
     )
     source_in_channels: int = source.config.in_channels  # type: ignore
@@ -81,6 +82,7 @@ def main() -> None:
             " source path."
         ),
     )
+    parser.add_argument("--subfolder", type=str, default="unet", help="Subfolder. Default: unet.")
     parser.add_argument("--half", action="store_true", help="Convert to half precision.")
     parser.add_argument(
         "--verbose",