descent gradient 中文意思是什麼

descent gradient 解釋
下降梯度
  • descent : n. 1. 下降，降下。2. 下坡，傾斜。3. 家世，門第，血統。4. 【法律】繼承，世襲。5. 一代；〈古語〉子孫，後裔。6. 突然襲擊。7. 屈尊，降格。
  • gradient : adj. 1. 傾斜的。2. 【動物；動物學】步行的，能步行的。n. 1. 〈英國〉（道路的）傾斜度，坡度，坡路。2. 【物理學】梯度，陡度，（溫度、氣壓等的）變化率，梯度變化曲線。
  1. The hybrid algorithm raises the convergence rate of the conjugate gradient method and solves the problem for which the convergence rate of the steepest descent method get slower when the isopleth of goal function is oblong

    這種混合優化演算法結合了共扼梯度法和最速下降法產生搜索方向，既提高了共扼梯度演算法的收斂速度，又解決了目標函數的等值線是扁長橢球時，最速下降法下降緩慢的問題，具有收斂速度快、收斂范圍大、適應面廣等特點。
  2. Procreant knowledge expression and forward inference engine are adopted in the method of fault diagnosis based on expert system theory. in the fault diagnosis applying neural network theory, six kinds of improved arithmetic of back - propagation arithmetic, including gradient descent with momentum, variable learning rate back - propagation, resilient back - propagation, quasi - newton, levenberg - marquardt and conjugate gradient, are applied to diagnose the faults of electric load manage center and solid state power controller. different diagnostic results gotten by simulation are compared at last

    在基於專家系統的故障診斷方法中，採用了產生式知識表達和正向推理機制；在基於神經網路的故障診斷方法中，則分別採用了bp神經網路的附加動量法、自適應學習速率、彈性bp演算法、擬牛頓法、共軛梯度法和levenberg - marquardt法對電氣負載管理中心和固態功率控制器的故障進行診斷，並對由模擬得到的不同診斷結果進行比較。
  3. A soft sensor modeling algorithm based on improved fuzzy neural network is presented. the normalized average output membership functions are defined as fuzzy basis functions for defuzzification calculation. in order to improve the property of convergence, some parameters of the fuzzy neural network are trained by levenberg - marquardt algorithm, and the others are trained by gradient descent algorithm

    提出了一種改進的模糊神經網路軟測量建模方法，採用規則化的平均輸出隸屬度函數作為模糊基函數進行反模糊化運算；在訓練網路時，部分參數採用levenberg - marquardt演算法來訓練，另一部分採用一階梯度下降法。
  4. Among hese method, one of the simplest is the deepest gradient descent algorithm, but it has one disadvantage that the solutions are oscillatory and slowly convergent. a friction term is ntroduced to avoid oscillatory solutions and raise convergence rate. the third major contribution of this dissertation is study on 3 - d diffuse object surface optical automatic measurement

    其次，結合要處理的具體問題，介紹數值優化及幾種常用的無約束最優化計算方法，以最優梯度法為基礎，討論其演算法的優缺點，通過引進阻尼系數，改進了演算法的收斂速度，從而提高迭代精度。
  5. The weights are trained with gradient descent method. the increase algorithm of bvs, and restricted algorithm, was induced

    利用梯度下降法對網路的權值進行訓練，並且推導了bvs的增長演算法，以及網路訓練的限制記憶遞推公式。
  6. A developed simple m - s model for image segmentation in geometric active contour model is presented based on intra - region similar and inter - region dissimilar properties. the model constructs an energy ( cost ) function, which is made of intra - region variations and weighting squares of subtraction of region mean values. using gradient - descent methods, the energy function is minimized and we get a curve evolution equation that segments image

    基於區域內一致性加權區域間差異性構造能量函數，利用最陡梯度法使能量函數最小化，提出了一種改進的簡化mumford - shah （ m - s ）圖像分割模型，該模型利用區域內方差描述區域內一致性，區域間平均灰度值之差的平方描述區域間差異性，實驗結果表明，通過調節加權系數，該模型對弱邊界圖像分割具有較強的適應性。
  7. The back - propagation algorithm also rests on the idea of gradient descent, and so the only change in the analysis of weight modification concerns the difference between t and y

    反向傳播演算法同樣來源於梯度降落原理，在權系數調整分析中的唯一不同是涉及到t （ p ， n ）與y （ p ， n ）的差分。
  8. Secondly, by incorporating the temporal difference prediction technique with the genetic algorithm, a novel hybrid genetic neural networks for controlling nonlinear chaotic system based on the scheme of small perturbations and the use of gradient descent learning method is presented ( known as hygann strategy )

    2 .研究了一種將暫態誤差預測技術、小擾動控制技術、梯度下降法和遺傳演算法（ ga ）融合起來控制非線性混沌系統的復合遺傳神經網路方法（簡稱hygann法） 。
  9. The self - tuning fuzzy control algorithm including a back - propagation - based fuzzy controller and the gradient descent method is applied to reduce the pitch motion of the swath ship with control stabilizing fins

    控制模式為一自調模糊控制，包括應用一類神經倒傳遞觀念的模糊控制器及梯度下降法來減少縱搖運動。
  10. So the paper combined the fuzzy logic control and recurrent neural network, and the recurrent fuzzy neural network ( rfnn ) controller is introduced into the speedsensorless vector control system. moreover, an online parameter training methodology, which is derived from the lyapunov stability theorem and gradient descent method is proposed to increase the learning capability of the rfnn. the rfnn controller has a better performance than the pi controller system ; the effectiveness of the proposed control scheme is verified by simulation results

    因此論文將模糊控制和具有優越動態性能的遞歸神經網路結合起來，取長補短，提出了一種遞歸模糊神經網路控制方法，利用神經網路來實現模糊推理，可動態的調整隸屬函數的形狀、位置以及神經網路遞歸權值，並對其與pi控制器的交流調速控制系統進行了模擬比較，模擬結果表明與普通的pi控制器相比較，遞歸模糊神經網路控制器有較好的動態性能，控制器的收斂速度快、靜差小，系統在遇到參數發生變化和外部不確定性問題時魯棒性、抗擾動性有明顯的提高。
  11. The gaussian function set depends on its centroid and width, therefore, we derive new supervised gradient descent algorithms to tune the parameters of " if - part " of gaussian functions. it also tunes the " then - part " of gaussian function

    高斯型函數是由它的中心和寬度兩個參數決定的，所以，我們給出新的有監督的梯度下降演算法來調整如果部分高斯函數與則部分的高斯函數的中心和寬度。
  12. Based on gradient descent rule, the bp ( back propagation ) algorithm is a local optimization algorithm

    Bp演算法基於梯度下降原理，是一種局部尋優演算法。
  13. A comparative study on some typical improved models of bp networks, which based on gradient descent and numerical optimization are proposed

    全局優化改進策略從基於網路模型的優化和基於網路演算法的優化兩個方面考慮。
  14. Observing that the newton direction is always a descent direction of the square norm of the gradient, even if it is not a descent direction of the objective function, which will result some linear research - such as armijo research or wolfe research - fail

    因此，該演算法是頗受歡迎的演算法之一。然而，若問題的目標函數的hessian陣不正定，則不能保證演算法產生的方向是目標函數的下降方向。
  15. The parameter of local model can be calculated by gradient descent in neighborhood with the sofm weight together, or estimated by least - squared estimation ( lse )

    局部模型的參數既可和映射網路權值一起在鄰域內採用梯度下降法修正，也可結合最小二乘法得到其最佳估計。
  16. Based on the steepest descent method and the conjugate gradient method, a hybrid algorithm is proposed in this paper, and its global convergence is proved

    摘要將最速下降法與共扼梯度法有機結合起來，構造出一種混合優化演算法，並證明其全局收斂性。
  17. In the image reconstruction based on optimization without constraint, the variable metric method, the steepest descent method, and conjugate gradient method were applied to image reconstruction to improve iterative efficiency and reconstructed quality, and their virtue and shortcoming were analyzed

    摘要在無約束最優化為基礎的圖像重建問題中，為了提高迭代效率以及重建圖像質量，首次提出將變度量法應用到圖像重建中。
  18. Video technol., aug. 1994, 4 : 438 - 442. 4 liu l k, peig e. a block - based gradient descent search algorithm for block motion estimation in video coding

    這些演算法適合於用在運動較為平緩的情況下，但是在運動較為劇烈的情況下，這些演算法很有可能陷入局部最優，因而造成搜索精度損失。
  19. A non - linear feed - forward loop is used to realize the coordinated control between the two controlled variables at the two control ends at first. secondly, a constant ac voltage control is implemented for a short period after the ac fault removal. finally, a staggered recovery strategy for different hvdc subsystems is also adopted, with the restart time interval of them optimized using the steepest descent gradient search method

    該協調恢復策略的三個特點是：在常規的控制器結構中加入一個基於準穩態工作點的非線性前饋迴路；在交流故障被切除后的一個短暫時間內，逆變側採用定交流電壓控制：對不同的直流輸電子系統採取一種漸進的恢復策略。
  20. Is based on the idea of gradient descent

    規則是基於梯度降落這樣一種思路。
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