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flan-t5-xxl

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Without the decoder_start_token_id parameter, you get the following ValueError while using the model:

    561 elif (
    562     hasattr(self.config, "decoder")
    563     and hasattr(self.config.decoder, "bos_token_id")
    564     and self.config.decoder.bos_token_id is not None
    565 ):
    566     return self.config.decoder.bos_token_id
--> 567 raise ValueError(
    568     "`decoder_start_token_id` or `bos_token_id` has to be defined for encoder-decoder generation."
    569 )

ValueError: `decoder_start_token_id` or `bos_token_id` has to be defined for encoder-decoder generation.

I checked https://huggingface.co/google/flan-t5-large/blob/main/config.json and noticed that output_past is also different.