Additionally, we introduce an alternative update rule using the incremental EM algorithm, which solves one important limitation of the update rule that was originally introduced in Ortiz-Martínez, García-Varea, and Casacuberta (2010).
the new update rule allows us to execute more than one training epoch over the incoming data while maintaining constant time and spatial complexity (see Sections 3 and 4.4 as well as Appendix A for more details).