## takes 3 positional arguments but 4 were given

```
  File "C:\Users\xusong28\Miniconda3\envs\py3.7-torch1.7\lib\site-packages\transformers\models\bart\modeling_bart.py", line 988, in __init__
    self.encoder = BartEncoder(config, self.shared)
  File "C:\Users\xusong28\Miniconda3\envs\py3.7-torch1.7\lib\site-packages\transformers\models\bart\modeling_bart.py", line 636, in __init__
    self.padding_idx,
TypeError: __init__() takes 3 positional arguments but 4 were given
```

用最新transformers

## not enough values to unpack (expected 2, got 1)


```
  File "C:\Users\xusong28\Miniconda3\envs\py3.7-torch1.7-hf.latest\lib\site-packages\torch\nn\modules\module.py", line 727, in _call_impl
    result = self.forward(*input, **kwargs)
  File "E:\workspace\python\fairseq\examples\kplug\hf\modeling_kplug_s2s_patch.py", line 25, in forward
    bsz, seq_len = input_ids_shape[:2]
ValueError: not enough values to unpack (expected 2, got 1)
```

版本问题，已在 `modeling_kplug_s2s_patch.py` 中解决

用最新transformers