[bugfix] fix an import error
@@ -15,7 +15,7 @@ import torch
from torch import nn
import numpy as np
-from fastNLP.io.file_utils import _get_file_name_base_on_postfix
+from ...io.file_utils import _get_file_name_base_on_postfix
from ...io.file_utils import _get_bert_dir
from ...core import logger
