src/transformers/models/big_bird/modeling_flax_big_bird.py/FlaxBigBirdPreTrainingHeads/setup
class FlaxBigBirdPreTrainingHeads:    def setup(self):
        self.predictions = FlaxBigBirdLMPredictionHead(self.config, dtype=self.dtype)
        self.seq_relationship = nn.Dense(2, dtype=self.dtype)