linguistic:translation, linguistic:voice_change, information:filtering, quality:correction, structural:summarization
Quadratic degrees of freedom

A degree of freedom X is quadratic if the energy terms associated with this degree of freedom can be written as E = α i X i 2 + β i X i Y, {\displaystyle E=\alpha _{i}\,X_{i}^{2}+\beta _{i}\,X_{i}Y,}