bijx.Inverse

class bijx.Inverse

Bases: Bijection

Inverted bijection that swaps forward and reverse directions.

This bijection wraps another bijection and swaps its forward() and reverse() methods.

Parameters:

bijection (Bijection) – The bijection to invert.

Note

Inverses of bijections should usually be created using bij.invert(). Then, bijx.invert().invert() == bij. Otherwise, Inverse(Inverse(bij)) while acting the same as bij does not “undo” the unnecessary wrapping.

__init__(bijection)

Parameters:

bijection (Bijection)

Methods

forward(x, log_density, **kwargs)	Apply forward transformation.
invert()	Return the original bijection (double inversion).
reverse(x, log_density, **kwargs)	Apply reverse (inverse) transformation.

forward(x, log_density, **kwargs)

Apply forward transformation.

Transforms input through the bijection and updates log-density according to the change of variables formula.

For convenience Bijection() gives the default identity bijection.

Parameters:

• x – Input data of any pytree structure.

• log_density – Log density values corresponding to the input.

• **kwargs – Additional transformation-specific arguments.

Returns:

Tuple of (transformed_data, updated_log_density) where the log-density incorporates the log absolute determinant of the transformation Jacobian.

reverse(x, log_density, **kwargs)

Apply reverse (inverse) transformation.

Transforms input through the inverse bijection and updates log-density accordingly.

Parameters:

• x – Input data of any pytree structure.

• log_density – Log density values corresponding to the input.

• **kwargs – Additional transformation-specific arguments.

Returns:

Tuple of (inverse_transformed_data, updated_log_density) where the log-density change has the opposite sign compared to forward().

invert()

Return the original bijection (double inversion).