support ORPO

src/llmtuner/train/rm/workflow.py

@@ -2,13 +2,12 @@
 
 from typing import TYPE_CHECKING, List, Optional
 
-from ...data import get_dataset, split_dataset
+from ...data import PairwiseDataCollatorWithPadding, get_dataset, split_dataset
 from ...extras.callbacks import FixValueHeadModelCallback
 from ...extras.misc import fix_valuehead_checkpoint
 from ...extras.ploting import plot_loss
 from ...model import load_model, load_tokenizer
 from ..utils import create_modelcard_and_push
-from .collator import PairwiseDataCollatorWithPadding
 from .metric import compute_accuracy
 from .trainer import PairwiseTrainer