(refactor) fixed relative import paths

+# Copyright 2020-present Tae Hwan Jung
+# 
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+#     http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from .modeling_bart import BartForConditionalGeneration
+
+__all__ = [
+    'BartForConditionalGeneration'
+]
\ No newline at end of file

@@ -21,7 +21,7 @@ from transformers import (
     PretrainedConfig,
     PreTrainedTokenizer,
 )
-from modeling_bart import BartForConditionalGeneration
+from .modeling_bart import BartForConditionalGeneration
 
 from transformers.optimization import (
     Adafactor,

@@ -41,7 +41,7 @@ from transformers.modeling_outputs import (
     Seq2SeqQuestionAnsweringModelOutput,
     Seq2SeqSequenceClassifierOutput,
 )
-from modeling_utils import PreTrainedModel
+from .modeling_utils import PreTrainedModel
 import logging
 
 logger = logging.getLogger(__name__)  # pylint: disable=invalid-name

@@ -39,7 +39,7 @@ from transformers.file_utils import (
     is_torch_tpu_available,
     replace_return_docstrings,
 )
-from generation_utils import GenerationMixin
+from .generation_utils import GenerationMixin
 import logging
 
 logger = logging.getLogger(__name__)  # pylint: disable=invalid-name