Found a very nice series on Lie group and Lie algebra. Watched the first couple lectures. The main message I got so far is that Lie algebra combine techniques from analysis (calculus) with algebra (group). And one nice thing I learned is that $latex \exp(A+B) = \exp(A) \exp(B)$ if $latex AB = BA$. I didn’t…
Came across Weiszfeld’s algorithm while reading the quaternion equivariant capsule paper. Weiszfeld’s algorithm is just a form of iteratively reweighted least square. And the algorithm is well illustrated with this tweet.
Any square matrix can be decomposed into Jordan normal form. The Jordan block can be decomposed into different numbers of Jordan boxes depending on the geometric multiplicity of the corresponding eigenvalues (only one box if the corresponding geometric multiplicity is one). This video series gives an excellent description to compute the Jordan normal form.
A motivating example of hindsight experience replay is a bit flipping problem. Say start with a binary number as an initial state, an action can be flipping any arbitrary bit, and the goal is to reach a particular state. It is, of course, a toy problem that can be solved easily. However, say if we…
Days are gone when installing CUDA driver was a hazzle. We can now simply install it with apt install. And for cuda toolkit, one can simply install by apt install nvidia-cuda-toolkit However, apt install does not install samples. We can install from run file explicitly. wget http://developer.download.nvidia.com/compute/cuda/10.1/Prod/local_installers/cuda_10.1.243_418.87.00_linux.run sudo sh cuda_10.1.243_418.87.00_linux.run # do not install driver…
I almost killed my phone again today. I didn’t realize that there are not just long, short screws in the phone. There are screws of different sizes: 0.12, 0.13, 0.16, and 0.17 mm just to replace the battery. I forgot how I killed my two iPhone 5S. But definitely, I didn’t know that there are…
The scene before and after I have already forgotten. I brought some people into my house. Somehow including Brad. This is the first time he appeared in my dream. The walls are full of bookcases, rather than like a home. It is more like an exhibition corner in a library. I almost led them to…
As I continue to explore options for using Zoom for teaching, one thing I like a lot is that I can connect my laptop to a monitor and only show one of the screens on Zoom. This way I can easily control what my students can see and I can leave some “cheat sheet” or…
The pipe behind the water heater broke during some very cold days. I don’t know how long the water was flooding out before I realize that stream was running out of the storage room. It took several weeks to fix it. I first considered looking for a plumber. But everyone seems to be so busy….
Tested Mynt Eye on my Thinkpad because it seems that it only supported up to 18.04. The sample example can run off the box as described here. However, it seems to need quite some work to get it run with OpenCV. Moreover, the depth estimation is not accurate at all. Not sure if further calibration…