modify some style

Former-commit-id: 053062abc007014a7fde95c5ae9f4d859893d8ad

src/llmtuner/train/sft/workflow.py

@@ -43,7 +43,7 @@ def run_sft(
     data_collator = DataCollatorForSeq2Seq(
         tokenizer=tokenizer,
         pad_to_multiple_of=8 if tokenizer.padding_side == "right" else None,  # for shift short attention
-        label_pad_token_id=(IGNORE_INDEX if data_args.ignore_pad_token_for_loss else tokenizer.pad_token_id),
+        label_pad_token_id=IGNORE_INDEX if data_args.ignore_pad_token_for_loss else tokenizer.pad_token_id,
     )
 
     # Override the decoding parameters of Seq2SeqTrainer

src/llmtuner/train/tuner.py

@@ -19,6 +19,7 @@ from .sft import run_sft
 if TYPE_CHECKING:
     from transformers import TrainerCallback
 
+
 logger = get_logger(__name__)