







摘 要:通過引入互補函數將張量絕對值問題重新表述為張量互補問題.針對重構的張量互補問題,建立了自適應非精確LM算法,并證明了算法的收斂性.數值實驗結果表明所提出的算法是有效的.
關鍵詞:張量絕對值方程;非精確LM方法;收斂性分析;數值實驗
中圖分類號:O241文獻標志碼:A
這個例子主要用于觀察算法1的迭代過程.隨機生成對稱張量B∈S[4,4]和隨機向量x*∈R4且張量B和向量x*元素取值均在[0,1].為了確保方程只有唯一的解,計算b=Ax*m-1-|x*|[m-1].這里取a=3,從而計算出c=4.899 8.為了檢驗本文算法1的有效性,將其與文獻[9]中算法3.1進行對比發現,要達到相同的精度,本文的算法1在迭代次數上并不具有優勢,但CPU時間是占優勢的,參見表3中的數值結果.分析其原因,文獻[9]中算法3.1是精確LM算法,每一迭代步需要精確求解LM方程,這是比較耗費時間的.另外從表4可以看到‖H(xk)‖隨著迭代次數k的增加會快速趨于0.此外,‖Ψ(xk)‖隨著迭代次數k的增加亦會快速趨于0.這說明了算法具有良好的收斂性.
此外,選擇不同的b值來測試算法的收斂結果.實驗中式(9)中的參數a取維15,數值結果見表5.其中xs表示方程的解,Iter表示迭代次數.
3 結 論
本文提出了一個求解連續張量絕對值方程的非精確自適應LM算法.分析了算法的全局收斂性和局部二次收斂性.并通過數值實例來驗證所做的理論分析及有效性和可行性.數值結果表明,本文所提出的算法是有效的.
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The inexact LM method for tensor absolute value equation
Ma Changfeng, Xie Yajun
(School of Big Data; Key Laboratory of Data Science and Intelligent Computing,
Fuzhou University of International Studies and Trade, Fuzhou 350202," China)
Abstract: In this paper," the tensor absolute value equations is reformulated into tensor complementary" problem by introducing complementary function. For the reformulated tensor complementary problem, an adaptive inexact Levenberg-Marquardt (LM) algorithm is proposed. And convergence theorem of the algorithm is proved. Numerical experiments show that the proposed algorithm is effective.
Keywords: tensor absolute value equation; inexact LM algorithm; convergence analysis; numerical experiment
[責任編校 陳留院 趙曉華] .