Chenguang Lu

9 Questions 24 Answers 0 Followers

Questions related from Chenguang Lu

What are problems with the Convergence Proof of the EM Algorithm?

My studies show that the popular convergence proof of the EM algorithm is not bilievable. An improved algorithm, CM algorithm, might ensure the convergence of mixture models. see...

21 October 2017 8,916 0 View

Can confirmation measures be useful for diagnosing COVID-19 when both NAT and CT are used?

If NAT(nucleic acid test) shows negative and CT shows positive, which should we believe? Can we calculate their degrees of confirmation to make decision? There are many confirmation measures. Are...

01 January 1970 825 12 View

Did you find there is a new trend in machine learning?

I found there is a new trend in machine learning, especially in deep learning: researchers use similarity function proportional to P(x|yj)/P(x)=P(yj|x)/P(yj) to construct estimated mutual...

01 January 1970 3,864 1 View

Is Q of the EM algorithm non-decreasing?

I found the popular convergence proof of the EM algorithm is wrong because Q may and should decrease in some E steps; P(Y|X) from the E-step is also improper Shannon's channel. For details, see my...

01 January 1970 6,953 3 View

Causal Confirmation: two Different Viewpoints

Two different viewpoints can be found as follows: Confirmation, causation, and simpson's paradox Confirmation, causation, and simpson's paradox Causal Confirmation Measures: From Simpson’s...

01 January 1970 6,756 3 View

About the convergence proof of mixture models

I found the popular convergence proof with EM algorithm for mixture models is incorrect because Q may and should decrease in some cases. For details see From the EM Algorithm to the CM-EM...

01 January 1970 6,240 1 View

Can we optimize semantic communication by Shannon's information Theory?

My answer is that we can replace distortion constraint with semantic constraint and then use Shannon's information theory to optimize semantic communication. In this way, we can keep existing...

01 January 1970 5,041 0 View

Ornate Birds' sexual Selection: Do you support Darwin or Wallace?

I support Darwin because I found that we can explain birds beauty preferences by the need relationships between birds and their food resources or...

01 January 1970 3,083 0 View

Birds' sexual selection: where did the hemale's beauty tasts come from?

A new explanation is that first needing relationships selected brids tasts, and laterly the female's tasts select the male's plumages. A video and a paper show how birds' colorful plumages reflect...

01 January 1970 8,726 0 View