descent function 中文意思是什麼
descent function
解釋
遞降函數-
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。 -
The results of numerical experiments, using the four - dimensional variational data assimilation system of the nonhydrostatic mesoscale model mm5, show that : the tangent linear model and adjoint model conducted by keeping the " on - off " switches the same as the basic state, can provide a good approximation of the first - order information to the nlm perturbation and a good descent direction for the minimization procedure ; switching on and off at every other time step in the kuo cumulus parameterization scheme do n ' t impact the convergence rate of cost function ; the existence of the switches do n ' t impact improvement to the mm5 model rainfall prediction because that not only specific humidity, but also wind, temperature and pressure are assimilated into the model
非靜力中尺度數值模式mm5的四維變分資料同化系統進行的數值試驗結果表明： 「開關」變量保持與基態一致，所構造的切向線性模式能夠提供關于非線性模式擾動的一階近似，伴隨模式所計算的梯度值能夠為最小化過程提供較好的下降方向；郭氏降水參數化方案中對流每隔一個積分步的交替發生並不影響目標函數最小化的收斂速度； 「開關」變量的存在也不影響將風、溫度、氣壓和比濕結合起來同化對mm5降水預報準確性的提高。 -
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。 -
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。 -
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。 -
Exercise could lead to remodeling of icn, of which normal exercise load might lead to proportional increase of cardiac and icn, adapting oneself ot transmit of contractility between myocardial bundles and cardiac muscle cell ( cmc ) under conditions of myocardial hypertrophy ; and exercise overload might lead to increase of a large number of different collagen among myocardial bundles, cmc, arteriole and capillary, that could lead to increase of stiffness and descent of systolic and diastolic function of heart
運動可引起心肌間質膠原網路結構的重塑，一般運動負荷可使心肌與間質膠原網路同步增長，以適應心肌細胞肥大收縮力增加從而保證肌束間及心肌細胞間力的傳遞；運動超負荷可使心肌束間、心肌細胞間以及小動脈和毛細血管間不同類型膠原大量蓄積增生，導致心臟的僵硬度增加，舒縮功能降低。 -
Since it adopt the steepest descent method in nonlinear programming, it has the drawback that easy converge to a local minimum point of the error function
由於它採用非線性規劃中的最速下降法，因而存在極易陷入局部極小的缺陷。 -
Similarity of structure between organs or parts, possibly of dissimilar function, that are related by common descent
同構發生，同源發生源於同一祖先，可能功能不同的器官或部分在結構上的相似 -
For nonlinear l1 problem based on the conditions for optimality of the nonlinear l1 problem in [ 1 ], we first discuss the descent direction of the objective function f ( x ) in theory, further more, we study the relation between the optimal solution of nonlinear l1 problem and the optimal solution of some kind of quadratic programming problem with box constrains. hence, we construct a descent algorithm for nonlinear l1 problem and prove the convergence of the algorithm
在文[ 1 ]所給的最優性條件的基礎上，對非線性l _ 1問題從理論上研究了f （ x ）的下降方向、最優解與某種框式約束最小二乘問題的最優解之間的關系，進而構造了一個非線性l _ 1問題的下降演算法，並證明了該演算法的收斂性。 -
The scope and function of zongpu is wider than the mere devising of tables of descent of its clan members
宗譜的廣度和用處不單是列出各宗支的一個圖表。 -
Using the indices of trajectory follow error and steering busyness in evaluation of the steering stability, a quadratic form performance index function for the neuron learning was established and the tuning of the connection weight values of the single neuron controller was realized using the algorithm of gradient descent
利用操縱穩定性評價中的軌跡跟隨誤差和方向盤忙碌程度的評價指標，建立了神經元學習的二次型性能指標函數，並採用梯度下降演算法實現了單神經元控制器的滾接權值的調整。 -
The main difficulty for the global convergence of the structured bfgs method lies in that the matrices generated by the method may not be positive definite. as a consequent, the direction generated by the method may not be a descent direction of the objective function
建立具有全局收斂性的結構化擬newton法的一個主要困難是在於該演算法產生的矩陣不一定是正定的，從而產生的搜索方向不一定是目標函數的下降方向。 -
This property is independent with the convexity of the objective function and the line search used. therefore, the generated directions are descent directions of the objective function
這一個性質與目標函數的凸性以及線性搜索無關，因而，產生的搜索方向總是目標函數的下降方向。
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