src/transformers/models/plbart/modeling_plbart.py/PLBartForConditionalGeneration/__init__
class PLBartForConditionalGeneration:    def __init__(self, config: PLBartConfig):
        super().__init__(config)
        self.model = PLBartModel(config)
        self.register_buffer("final_logits_bias", torch.zeros((1, self.model.shared.num_embeddings)))
        self.lm_head = nn.Linear(config.d_model, self.model.shared.num_embeddings, bias=False)

        self.init_weights()