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v. Simple past tense and past participle of symmetrize.

"Symmetrization of the neighborhood relation: If xi belongs to the k-nearest-neighborhood of xj and if xj does not belong to the k-nearest-neighborhood of xi, the point xj is added to the set of neighbors of xi Notation: i ∼ k j The transformed set of neighbors is then called the symmetrized k-nearest-neighbor system."

symmetrized    symmetrizing   

change    modify    alter   

symmetrized    symmetrizing