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## Homework Statement

I want to know what is the meaning of ##N_i## ##m-dimensional## samples where ##i=1, 2, 3,...##

## Homework Equations

No equation

## The Attempt at a Solution

I know the meaning of N*m. It means N persons and m means that each person has m features. Please guide what is the meaning of ##N_i## ##m-dimensional## features.

Thanks.