报错信息 UserWarning: Dataset has 0 variance; skipping density estimate. Pass warn_singular=False to disable this warning. 三维数组维度(1000, 27,1),取出第一个元素画出分布图保存检查错误原因,print(Mcases[:,:,0].shape) 显示维度(1000, 27)
Andrew Ng机器学习week6(Regularized Linear Regression and Bias/Variance)编程习题 linearRegCostFunction.m function [J, grad] = linearRegCostFunction(X, y, theta, lambda)%LINEARREGCOSTFUNCTION Compute cost an
在A Few Useful Thingsto Know about Machine Learning中提到,可以将泛化误差(gener-alization error)分解成bias和variance理解。 Bias: a learner’s tendency to consistently learn the same wrong thing,即度量了某种学习算法的平均估计结果所能逼
Markowitz Mean-Variance Portfolio Theory An investment instrument that can be bought and sold is often called an asset. Suppose we purchase an asset for x 0 x_0 x0 dollars on one date and then late
方差、偏差的直观意义 方差维基百科定义: Var ( X ) = E [ ( X − μ ) 2 ] 其 中 μ = E ( X ) \operatorname{Var}(X)=\mathrm{E}\left[(X-\mu)^{2}\right] 其中\mu=\mathrm{E}(X) Var(X)=E[(X−μ)2]其中μ=E(X) 在给定数据集中 方差: var ( x ) =
吴恩达 机器学习 第六周作业 Regularized Linear Regression and Bias v.s.Variance Octave代码 linearRegCostFunction.m function [J, grad] = linearRegCostFunction(X, y, theta, lambda)%LINEARREGCOSTFUNCTION Compute co