fix data map for packing

src/llamafactory/data/preprocess.py

@@ -15,6 +15,8 @@
 from functools import partial
 from typing import TYPE_CHECKING, Callable, Literal, Optional, Tuple
 
+from datasets.arrow_writer import OptimizedTypedSequence, TypedSequence
+
 from .processors.feedback import preprocess_feedback_dataset
 from .processors.pairwise import preprocess_pairwise_dataset, print_pairwise_dataset_example
 from .processors.pretrain import preprocess_pretrain_dataset
@@ -50,6 +52,18 @@ def get_preprocess_and_print_func(
         print_function = partial(print_unsupervised_dataset_example, tokenizer=tokenizer)
     elif stage == "sft" and not training_args.predict_with_generate:
         if data_args.packing:
+            if data_args.neat_packing:
+
+                def __init__(self, data, **kwargs):
+                    return TypedSequence.__init__(
+                        self,
+                        data,
+                        type=kwargs.pop("type", None),
+                        try_type=kwargs.pop("try_type", None),
+                        optimized_int_type=kwargs.pop("optimized_int_type", None),
+                    )
+
+                OptimizedTypedSequence.__init__ = __init__
             preprocess_func = partial(
                 preprocess_packed_supervised_dataset,
                 template=template,