fix #4402 #4617

Deprecate reserved_label_len arg

src/llamafactory/data/data_utils.py

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 from enum import Enum, unique
-from typing import TYPE_CHECKING, Dict, List, Tuple, Union
+from typing import TYPE_CHECKING, Dict, List, Sequence, Set, Union
 
 from datasets import concatenate_datasets, interleave_datasets
 
@@ -30,6 +30,9 @@ if TYPE_CHECKING:
 logger = get_logger(__name__)
 
 
+SLOTS = Sequence[Union[str, Set[str], Dict[str, str]]]
+
+
 @unique
 class Role(str, Enum):
     USER = "user"
@@ -39,13 +42,6 @@ class Role(str, Enum):
     OBSERVATION = "observation"
 
 
-def infer_max_len(source_len: int, target_len: int, max_len: int, reserved_label_len: int) -> Tuple[int, int]:
-    max_target_len = int(max_len * (target_len / (source_len + target_len)))
-    max_target_len = max(max_target_len, reserved_label_len)
-    max_source_len = max_len - min(max_target_len, target_len)
-    return max_source_len, max_target_len
-
-
 def merge_dataset(
     all_datasets: List[Union["Dataset", "IterableDataset"]],
     data_args: "DataArguments",