Some of its aspects include data organization, sampling, irreducibility (or redundancy) and the interplay between the local and global character of the representation and/or of the classifier.

• 复杂度的问题关系到数据的组织方法、取样方法、还原性（或冗余性），还有表示方法和分类器中的局部和全局特征之间的相互影响。