Planar Normalizing Flow (1D)

A simple and readable implementation of a 1-dimensional planar flow: z_K = z_0 + u * h(wz_0 + b)

Usage

planarflowmodel(u, w, b)

Arguments

u

Scalar parameter controlling the magnitude of the deformation.

w

Scalar parameter controlling the slope of the activation.

b

Scalar bias term.

Value

A flow model object with methods:

• sampleq(n)

• logq(z0)

• applyflow(z0)

Details

where:

• h is a smooth activation (tanh)

• the log-determinant is computed analytically

This flow is mainly useful for pedagogical purposes or as a lightweight building block in variational inference.