src/transformers/models/pegasus_x/modeling_pegasus_x.py/PegasusXForConditionalGeneration/__init__
class PegasusXForConditionalGeneration:    def __init__(self, config: PegasusXConfig):
        super().__init__(config)
        self.model = PegasusXModel(config)
        self.lm_head = nn.Linear(config.d_model, self.model.shared.num_embeddings, bias=False)

        # Initialize weights and apply final processing
        self.post_init()