In statistics and applications of statistics, normalization can have a range of meanings. In the simplest cases, normalization of ratings means adjusting values measured on different scales to a notionally common scale, often prior to averaging. In the case of L2-Normalization this adjustment is applied on the basis of the L2-Norm, which is defined as:  |x|₂ = Σ_i(x_i^2)
In this case the corresponding normalization would be defined as:
norm(x) = x/|x|₂
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