(1)Dimensionality Reduction: A Comparative Review的P15頁(yè)The presence of free parameters has both advantagesand disadvantages. The main advantage of the presence of free parameters is that they provide more flexibility to the technique, whereas their main disadvantage is that they need to be tuned to optimize the performance of the dimensionality reduction technique.
(2)Zhongqiu Zhao's Ph.D. thesis P87:雖然此參數(shù)可能會(huì)給半監(jiān)督學(xué)習(xí)帶來(lái)可靈活機(jī)動(dòng)的好處，但是同時(shí)它也增加了程序調(diào)試的難度。
(3)Fei Wang's Ph.D. thesis P13:圖上半監(jiān)督學(xué)習(xí)算法大都需要用高斯函數(shù)(式(1-6))計(jì)算數(shù)據(jù)之間的相似度，并且該函數(shù)中的自由參數(shù)\sigma是需要由用戶指定的，這給這類算法在實(shí)際中的應(yīng)用帶來(lái)了很大的麻煩。