In a normal microarray classification problem there will be many genes, on the order of thousands, and few samples, on the order of tens.

• 科学家藉由基因微阵列资料来瞭解数万个基因所代表的意义与其相互关系，然而基因微阵列具有高维度、小样本之特性，因此在分类时会造成许多困难。