fix IsADirectoryError when running the training code for sd3_dreambooth_lora_16gb.ipynb

[alaister123]

fix IsADirectoryError when running the training code

What does this PR do?

Fixes the training code crashing for sd3_dreambooth_lora_16gb.ipynb
Running the current notebook will result in the following error when running the training section

Traceback (most recent call last):
  File "/content/diffusers/examples/research_projects/sd3_lora_colab/train_dreambooth_lora_sd3_miniature.py", line 1147, in <module>
    main(args)
  File "/content/diffusers/examples/research_projects/sd3_lora_colab/train_dreambooth_lora_sd3_miniature.py", line 848, in main
    train_dataset = DreamBoothDataset(
  File "/content/diffusers/examples/research_projects/sd3_lora_colab/train_dreambooth_lora_sd3_miniature.py", line 521, in __init__
    instance_images = [Image.open(path) for path in list(Path(instance_data_root).iterdir())]
  File "/content/diffusers/examples/research_projects/sd3_lora_colab/train_dreambooth_lora_sd3_miniature.py", line 521, in <listcomp>
    instance_images = [Image.open(path) for path in list(Path(instance_data_root).iterdir())]
  File "/usr/local/lib/python3.10/dist-packages/PIL/Image.py", line 3431, in open
    fp = builtins.open(filename, "rb")
IsADirectoryError: [Errno 21] Is a directory: '/content/diffusers/examples/research_projects/sd3_lora_colab/dog/.cache'
Traceback (most recent call last):
  File "/usr/local/bin/accelerate", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.10/dist-packages/accelerate/commands/accelerate_cli.py", line 48, in main
    args.func(args)
  File "/usr/local/lib/python3.10/dist-packages/accelerate/commands/launch.py", line 1168, in launch_command
    simple_launcher(args)
  File "/usr/local/lib/python3.10/dist-packages/accelerate/commands/launch.py", line 763, in simple_launcher
    raise subprocess.CalledProcessError(returncode=process.returncode, cmd=cmd)
subprocess.CalledProcessError: Command '['/usr/bin/python3', 'train_dreambooth_lora_sd3_miniature.py', '--pretrained_model_name_or_path=stabilityai/stable-diffusion-3-medium-diffusers', '--instance_data_dir=dog', '--data_df_path=sample_embeddings.parquet', '--output_dir=trained-sd3-lora-miniature', '--mixed_precision=fp16', '--instance_prompt=a photo of sks dog', '--resolution=1024', '--train_batch_size=1', '--gradient_accumulation_steps=4', '--gradient_checkpointing', '--use_8bit_adam', '--learning_rate=1e-4', '--report_to=wandb', '--lr_scheduler=constant', '--lr_warmup_steps=0', '--max_train_steps=500', '--seed=0']' returned non-zero exit status 1.

It seems like this line is outdated

!rm -rf dog/.huggingface

It should be instead

!rm -rf dog/.cache

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Hi @sayakpaul can you please take a look at my pull request thanks

[sayakpaul]

Thanks!

[sayakpaul]

Failing tests are unrelated.