sigma_est: title module for estiamtion of the variance structure
In kkdey/flashr: Factor Loading Adaptive SHrinkage in R

description estiamtion of the variance structure

1	sigma_est(sigmae2_v, sigmae2_true, sigmae2_pre = NA, partype = "constant")

`sigmae2_v`	residual matrix
`sigmae2_true`	true variance structure
`sigmae2_pre`	the previouse sigmae2 which is only used in Bayes_var
`partype`	parameter type for the variance, "constant" for constant variance, "var_col" for nonconstant variance for column, "known" for the kown variance, "Bayes_var" for Bayes version of the nonconstant variance for row and column "noisy" is anova estiamtion for the log residual square