src/transformers/models/big_bird/modeling_big_bird.py/BigBirdForQuestionAnsweringHead/__init__
class BigBirdForQuestionAnsweringHead:    def __init__(self, config):
        super().__init__()
        self.dropout = nn.Dropout(config.hidden_dropout_prob)
        self.intermediate = BigBirdIntermediate(config)
        self.output = BigBirdOutput(config)
        self.qa_outputs = nn.Linear(config.hidden_size, config.num_labels)