src/transformers/models/bigbird_pegasus/modeling_bigbird_pegasus.py/BigBirdPegasusForSequenceClassification/__init__
class BigBirdPegasusForSequenceClassification:    def __init__(self, config: BigBirdPegasusConfig, **kwargs):
        super().__init__(config, **kwargs)
        self.model = BigBirdPegasusModel(config)
        self.classification_head = BigBirdPegasusClassificationHead(
            config.d_model,
            config.d_model,
            config.num_labels,
            config.classifier_dropout,
        )

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