keras/src/losses/losses.py/Huber/__init__
class Huber:    def __init__(
        self,
        delta=1.0,
        reduction="sum_over_batch_size",
        name="huber_loss",
        dtype=None,
    ):
        super().__init__(
            huber, name=name, reduction=reduction, dtype=dtype, delta=delta
        )