Mixing self-consistent quantities

Mixing various quantities in self-consistent manners are quite frequent. This module enables a variety of methods based on the Pulay (DIIS) mixing methods and may be used for externally driven SC cycles.

Container classes

Mixing makes use of so called metrics and several steps of quantities stored in history.

The basic classes that are used internally are

History([history])

A history class for retaining a set of history elements

BaseMixer()

Base class mixer

BaseWeightMixer([weight])

Base class mixer

BaseHistoryWeightMixer([weight, history])

Base class mixer with history

StepMixer(*yield_funcs)

Step between different mixers in a user-defined fashion

Mixing algorithms

LinearMixer([weight, history])

Linear mixing

AndersonMixer([weight, history])

Anderson mixing

DIISMixer([weight, history, metric])

Direct inversion of the iterative subspace (DIIS mixing)

PulayMixer([weight, history, metric])

AdaptiveDIISMixer([weight, history, metric])

Adapt the mixing weight according to the Lagrange multiplier

AdaptivePulayMixer([weight, history, metric])