* Added ``pylops.signalprocessing.ChirpRadon2D`` and
``pylops.signalprocessing.ChirpRadon3D`` operators.
* Fixed bug in the inferred dimensions for regularization data creation
in ``pylops.optimization.leastsquares.NormalEquationsInversion``,
``pylops.optimization.leastsquares.RegularizedInversion``, and
``pylops.optimization.sparsity.SplitBregman``.
* Changed dtype of ``pylops.HStack`` to allow automatic inference from
dtypes of input operator.
* Modified dtype of ``pylops.waveeqprocessing.Marchenko`` operator to
ensure that outputs of forward and adjoint are real arrays.
* Reverted to previous complex-friendly implementation of
``pylops.optimization.sparsity._softthreshold`` to avoid division by 0.