tensordict.nn.biased_softplus

class tensordict.nn.biased_softplus(bias: float, min_val: float = 0.01)

A biased softplus module.

The bias indicates the value that is to be returned when a zero-tensor is passed through the transform.

Parameters:

• bias (scalar) – ‘bias’ of the softplus transform. If bias=1.0, then a _bias shift will be computed such that softplus(0.0 + _bias) = bias.

• min_val (scalar) – minimum value of the transform. default: 0.1