[backend] why Pointwise descriptor have two alpha1 & alpha2 attributes?

Hello, for the dual-input point-wise operators, could you give some example on when these two attributes are needed to set to values other than 1.0?
CUDNN_ATTR_OPERATION_POINTWISE_ALPHA1
CUDNN_ATTR_OPERATION_POINTWISE_ALPHA2

I believe 1.0 are already enough for real cases.

Thanks
Gino

CUDNN_ATTR_OPERATION_POINTWISE_ALPHA2

If the operation requires 2 inputs, such as add or multiply, this attribute sets the scalar alpha2alpha2 value in the equation. Can be in float or half. This attribute is optional, if not set, the default value is 1.0. If the operation requires only 1 input, this field is not used and should not be set.

Thanks for your reply. Have you come with any sub-graph in real models have alpha2 to be set other than 1.0?