modify some style

src/llmtuner/data/preprocess.py

@@ -6,7 +6,6 @@ from ..extras.constants import IGNORE_INDEX
 from ..extras.logging import get_logger
 from .utils import Role
 
-
 if TYPE_CHECKING:
     from transformers import Seq2SeqTrainingArguments
     from transformers.tokenization_utils import AutoProcessor, PreTrainedTokenizer
@@ -280,5 +279,4 @@ def get_preprocess_and_print_func(
             preprocess_unsupervised_dataset, tokenizer=tokenizer, template=template, data_args=data_args
         )
         print_function = partial(print_unsupervised_dataset_example, tokenizer=tokenizer)
-
     return preprocess_func, print_function