fix unused imports and style

src/transformers/modeling_tf_distilbert.py

@@ -24,7 +24,7 @@ import tensorflow as tf
 
 from .configuration_distilbert import DistilBertConfig
 from .file_utils import add_start_docstrings, add_start_docstrings_to_callable
-from .modeling_tf_utils import TFPreTrainedModel, TFSharedEmbeddings, get_initializer, keras_serializable, shape_list
+from .modeling_tf_utils import TFPreTrainedModel, TFSharedEmbeddings, get_initializer, shape_list
 
 
 logger = logging.getLogger(__name__)

src/transformers/modeling_tf_openai.py

@@ -29,7 +29,6 @@ from .modeling_tf_utils import (
     TFSequenceSummary,
     TFSharedEmbeddings,
     get_initializer,
-    keras_serializable,
     shape_list,
 )
 

src/transformers/modeling_tf_roberta.py

@@ -20,11 +20,10 @@ import logging
 
 import tensorflow as tf
 
-from . import PretrainedConfig
 from .configuration_roberta import RobertaConfig
 from .file_utils import add_start_docstrings, add_start_docstrings_to_callable
 from .modeling_tf_bert import TFBertEmbeddings, TFBertMainLayer, gelu
-from .modeling_tf_utils import TFPreTrainedModel, get_initializer, keras_serializable, shape_list
+from .modeling_tf_utils import TFPreTrainedModel, get_initializer, shape_list
 
 
 logger = logging.getLogger(__name__)

src/transformers/modeling_tf_t5.py

@@ -25,7 +25,7 @@ import tensorflow as tf
 
 from .configuration_t5 import T5Config
 from .file_utils import DUMMY_INPUTS, DUMMY_MASK, add_start_docstrings
-from .modeling_tf_utils import TFPreTrainedModel, TFSharedEmbeddings, keras_serializable, shape_list
+from .modeling_tf_utils import TFPreTrainedModel, TFSharedEmbeddings, shape_list
 
 
 logger = logging.getLogger(__name__)

src/transformers/modeling_tf_xlm.py

@@ -25,14 +25,7 @@ import tensorflow as tf
 
 from .configuration_xlm import XLMConfig
 from .file_utils import add_start_docstrings, add_start_docstrings_to_callable
-from .modeling_tf_utils import (
-    TFPreTrainedModel,
-    TFSequenceSummary,
-    TFSharedEmbeddings,
-    get_initializer,
-    keras_serializable,
-    shape_list,
-)
+from .modeling_tf_utils import TFPreTrainedModel, TFSequenceSummary, TFSharedEmbeddings, get_initializer, shape_list
 
 
 logger = logging.getLogger(__name__)

tests/test_modeling_tf_common.py

@@ -102,8 +102,9 @@ class TFModelTesterMixin:
             for module_member_name in dir(module)
             if module_member_name.endswith("MainLayer")
             for module_member in (getattr(module, module_member_name),)
-            if isinstance(module_member, type) and tf.keras.layers.Layer in module_member.__bases__
-            and getattr(module_member, '_keras_serializable', False)
+            if isinstance(module_member, type)
+            and tf.keras.layers.Layer in module_member.__bases__
+            and getattr(module_member, "_keras_serializable", False)
         )
         for main_layer_class in tf_main_layer_classes:
             main_layer = main_layer_class(config)