Added missing imports.

examples/run_swag.py

@@ -15,6 +15,8 @@
 # limitations under the License.
 """BERT finetuning runner."""
 
+from __future__ import absolute_import
+
 import argparse
 import csv
 import logging
@@ -31,7 +33,7 @@ from torch.utils.data.distributed import DistributedSampler
 from tqdm import tqdm, trange
 
 from pytorch_pretrained_bert.file_utils import PYTORCH_PRETRAINED_BERT_CACHE
-from pytorch_pretrained_bert.modeling import BertForMultipleChoice
+from pytorch_pretrained_bert.modeling import (BertForMultipleChoice, BertConfig, WEIGHTS_NAME, CONFIG_NAME)
 from pytorch_pretrained_bert.optimization import BertAdam, warmup_linear
 from pytorch_pretrained_bert.tokenization import BertTokenizer