src/transformers/models/big_bird/modeling_big_bird.py/BigBirdForSequenceClassification/__init__
class BigBirdForSequenceClassification:    def __init__(self, config):
        super().__init__(config)
        self.num_labels = config.num_labels
        self.config = config
        self.bert = BigBirdModel(config)
        self.classifier = BigBirdClassificationHead(config)

        self.init_weights()