english: This is straightforward, except that now the constraints on μ {\displaystyle \mu } are doubly stochastic matrix constraints: ∀ j ∑ i = 1 M μ i j = 1 {\displaystyle \forall j~\sum _{i=1}^{M}\mu _{ij}=1} and ∀ i ∑ j = 1 N μ i j = 1 {\displaystyle \forall i~\sum _{j=1}^{N}\mu _{ij}=1} .
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