An S4 class for mmpca_clust(). It is mainly a
wrapper around the class '>TopicModelcontrol
(specifically: LDA_VEMcontrol).
control_lda_initObject of class "LDA_VEMcontrol"; specifies the
controls of the VEM algorithm used for the initialization of beta.
control_lda_loopObject of class "LDA_VEMcontrol"; specifies the
controls for the VEM algorithm used after a swap in the branch & bound.