flytomylife

摘要： When we need Factor Analysis:Factor Analysis: If we have very few data, however we still wanna to estimate it though Gaussian distribution, unfortunately, if we adopt Gaussian directly we would get pretty bad consequence, the result Gaussian would be affine within the data spanned space(long and thi 阅读全文

摘要： (From yesterday to now, I have learning EM for 4 times, and each time I will gain some new ideas and correct some misunderstandings. So cool!)Finally knows that the P(x(i),z(i);θ) means the joint distribution of x and z, parametered byθ.Only if the taget data's distribution belongs to exponentia 阅读全文

摘要： Yesterday while reviewing the SVM, I understand why we need to transfer the prime form into the dual form.The reason is that in the prime form, we have to solve the maximum optimization problem for αfirstly, however if we take derivative with respect to α, we would get the original optimization form 阅读全文