Softplus

class pmrf.stats.Softplus(_is_constant_jacobian: bool = False, _is_constant_log_det: bool = False)

Bases: AbstractForwardInverseBijector, AbstractInvLogDetJacBijector, AbstractFwdLogDetJacBijector

Transforms the real line to the positive domain using softplus y = log(1 + exp(x)).

forward_and_log_det(x: Array) → tuple[Array, Array]

Computes y = softplus(x) and log|det J(f)(x)|.

inverse_and_log_det(y: Array) → tuple[Array, Array]

Computes x = softplus^{-1}(y) and log|det J(f^{-1})(y)|.

same_as(other: AbstractBijector) → bool

Returns True if this bijector is guaranteed to be the same as other.