dreambooth #1566: fixed formatting reported by 'black' build check

Author: timh

examples/dreambooth/train_dreambooth.py

@@ -684,8 +684,10 @@ def main(args):
                         # it, the models will be unwrapped, and when they are then used for further training,
                         # we will crash. pass this, but only to newer versions of accelerate. fixes
                         # https://github.com/huggingface/diffusers/issues/1566
-                        accepts_keep_fp32_wrapper = 'keep_fp32_wrapper' in set(inspect.signature(accelerator.unwrap_model).parameters.keys())
-                        extra_args = {'keep_fp32_wrapper': True} if accepts_keep_fp32_wrapper else {}
+                        accepts_keep_fp32_wrapper = "keep_fp32_wrapper" in set(
+                            inspect.signature(accelerator.unwrap_model).parameters.keys()
+                        )
+                        extra_args = {"keep_fp32_wrapper": True} if accepts_keep_fp32_wrapper else {}
                         pipeline = DiffusionPipeline.from_pretrained(
                             args.pretrained_model_name_or_path,
                             unet=accelerator.unwrap_model(unet, **extra_args),