与非的本子

摘要： 仅列出核心代码： 1.estimateGuassian.m mu = mean(X)'; X2 = (X - ones(m, 1)*mu').^2; sigma2 = mean(X2); 2.selectThreshold.m cvPredictions = (pval < epsilon); tp = sum((... 阅读全文

摘要： 仅列出核心代码： 1.findClosestCentroids.m m = size(X, 1); len = zeros(K, 1); for i = 1:m for j = 1:K len(j) = norm(X(i, :) - centroids(j, :))^2; en... 阅读全文

摘要： 仅列出核心代码： 1.gaussianKernel.m sim = exp(-sum((x1 - x2).^2) /(2*sigma^2)); 2.dataset3Params.m TD = [0.01, 0.03, 0.1, 0.3, 1, 3, 10, 30]; pre_err = zeros(length(TD)); for i = 1... 阅读全文

摘要： 仅列出核心代码： 1.linearRegCostFunction.m h = X * theta; J = (X * theta - y).' * (X * theta - y) / (2*m)... +(lambda/(2*m)) * sum(theta(2:end).^2); grad = grad(:); gra... 阅读全文

摘要： 仅列出核心代码： 1.sigmoidGradient.m h = 1.0 ./ (1.0 + exp(-z)); g = h.*(1 - h); 2.randInitializeWeights.m epsilon_init = 0.12; W = rand(L_out, 1 + L_in)*2*epsilon_init - epsilon_init... 阅读全文

摘要： 仅列出核心代码： 1.lrCostFunction.m h = sigmoid(X * theta); % h_theta(X) : m*1 % Cost func J = (-log(h.')*y - log(ones(1, m) - h.')*(ones(m, 1) - y)) / m ... +(lambda/(2*... 阅读全文

摘要： 仅列出核心代码： 1.plotData.m ind1 = find(y==1); ind0 = find(y==0); plot(X(ind1, 1), X(ind1, 2), 'k+','LineWidth', 2, 'MarkerSize', 7); plot(X(ind0, 1), X(ind0, 2), 'ko', 'MarkerFaceCo... 阅读全文

摘要： 仅列出核心代码： 1.computeCost J = sum((X*theta-y).^2)/(2*m); 2.gradientDescent theta = theta - (1/m)*alpha*(X.'*(X*theta-y)); 3.featureNormalize mu = mean(X); sigma = std(X); ... 阅读全文

摘要： one thing is certain: the workers were hard to feel a sense of accomplishment or happiness. Dan Ariely etc. (D Ariely, 2008) and Michael Norton etc. (M Norton, 2012), made a statement of a unanimous conclusion in their papers, which is: "a sense of identity" is important to everyone. This sense of identity comes from both the completion of the work and the affirmation of the results of the work from others. As "IKEA Effect" indicated, a doubly cherish would be put on the fruit of the task which 阅读全文

摘要： 本文介绍一种如何在博文中显示非图片形式数学公式的方法。只需在博客后台设置「页首Html代码」项中添加以下代码，即可调用MathJax的CDN在你的博客中显示$\LaTeX$公式，并且这样产生的公式可以任意缩放而无失真。 1 <script type="text/x-mathjax-config"> 2 MathJax.Hub.Config({ 3 tex2jax: { 4 inlineMath: [ 5 ['$', '$'], 6 ['\\(', '\\)'] 7 ... 阅读全文