Clean special token init in modeling_....py (#3264)

* make style

* fix conflicts

src/transformers/configuration_bart.py

@@ -41,9 +41,6 @@ class BartConfig(PretrainedConfig):
         activation_dropout=0.0,
         activation_function="gelu",
         vocab_size=50265,
-        bos_token_id=0,
-        pad_token_id=1,
-        eos_token_ids=[2],
         d_model=1024,
         encoder_ffn_dim=4096,
         encoder_layers=12,
@@ -61,6 +58,9 @@ class BartConfig(PretrainedConfig):
         output_past=False,
         num_labels=3,
         is_encoder_decoder=True,
+        pad_token_id=1,
+        bos_token_id=0,
+        eos_token_id=2,
         **common_kwargs
     ):
         r"""
@@ -74,7 +74,7 @@ class BartConfig(PretrainedConfig):
             output_past=output_past,
             pad_token_id=pad_token_id,
             bos_token_id=bos_token_id,
-            eos_token_ids=eos_token_ids,
+            eos_token_id=eos_token_id,
             is_encoder_decoder=is_encoder_decoder,
             **common_kwargs,
         )