Function hard_sigmoid

pub fn hard_sigmoid<const D: usize, B>(
    tensor: Tensor<B, D>,
    alpha: f64,
    beta: f64,
) -> Tensor<B, D>
where
    B: Backend,

Applies the hard sigmoid function element-wise.

$$ \text{hard\_sigmoid}(x) = \max(0, \min(1, \alpha x + \beta)) $$