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Could anyone know why define an variable umat?

Could anyone know someone tell me why to define an variable umat?"umat"? The reasonn is ........???

Hi all: Could someone tell me why to define an variable "umat"? The reasonn is ........???........??? How to convert mat <---> UMat and vector<mat> <--->
vector<umat>

Hi all: Could someone tell me why to define an variable "umat"? The reasonn is ........??? How to convert mat <---> UMat and vector<mat> <---> vector<umat> ?? thanks!!
vector<umat>