Error when loading a trained Encoder-Decoder model. 
# 🐛 Bug Report
When loading the config the in configuration_auto.py the model_type is expected on the form encoder-decoder 
but in configuration_encoder_decoder.py 
model_type is on the form encoder_decoder which raises a KeyError.
Hi @Xunzhuo,
Multiple bugs were fixed in #4680 . Can you please take a look whether this error persists?<|||||>okay tks!